null  null
35B-1
GROUP 35B
ANTI-SKID
BRAKING SYSTEM
(ABS)
CONTENTS
SERVICE SPECIFICATIONS. . . . . . .
35B-3
SPECIAL TOOLS. . . . . . . . . . . . . . . .
35B-3
TROUBLESHOOTING . . . . . . . . . . . .
35B-5
DIAGNOSIS TROUBLESHOOTING FLOW
35B-5
NOTES WITH REGARD TO DIAGNOSIS .
35B-5
ABS WARNING LAMP AND BRAKE WARNING LAMP
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35B-5
DIAGNOSTIC FUNCTION . . . . . . . . . . . . .
35B-6
DIAGNOSIS CODE CHART . . . . . . . . . . . .
35B-11
DIAGNOSIS CODE PROCEDURES . . . . .
35B-12
Code No. C100A FL wheel speed sensor circuit
Code No. C1015 FR wheel speed sensor circuit
Code No. C1020 RL wheel speed sensor circuit
Code No. C102B RR wheel speed sensor circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-12
Code No. C1011 FL wheel speed sensor signal
Code No. C101C FR wheel speed sensor signal
Code No. C1027 RL wheel speed sensor signal
Code No. C1032 RR wheel speed sensor signal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-15
Code No. C1014 FL wheel speed sensor performance
Code No. C101F FR wheel speed sensor performance
Code No. C102A RL wheel speed sensor performance
Code No. C1035 RR wheel speed sensor performance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-18
Code No. C1041 FL wheel speed tone performance
Code No. C1042 FR wheel speed tone performance
Code No. C1043 RL wheel speed tone performance
Code No. C1044 RR wheel speed tone performance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-21
Code No. C1046 FL wheel speed sensor phase
Code No. C1047 FR wheel speed sensor phase
Code No. C1048 RL wheel speed sensor phase
Code No. C1049 RR wheel speed sensor phase
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-23
Code No. C104B FL inlet valve
Code No. C104F FR inlet valve
Code No. C1053 RL inlet valve
Code No. C1057 RR inlet valve
Code No. C105F FL outlet valve
Code No. C1063 FR outlet valve
Code No. C1067 RL outlet valve
Code No. C105B RR outlet valve . . . . . . . .
35B-26
Code No. C2104 Valve power supply circuit
35B-27
Code No. C1073 Motor drive circuit . . . . . .
35B-29
Code No. C2116 Pump motor voltage low .
35B-30
Code No. C1000 Brake SW (stuck) . . . . . . .
35B-32
Code No. C2200 ECU internal error . . . . . .
35B-33
Code No. C2101 Power supply high voltage
......................................
35B-33
Code No. C1395 Incomplete Brake fluid filling
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-34
Code No. C1210 Longitudinal G SNS.input circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-34
Code No. C1242 Longitudinal G sensor signal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-35
Code No. C123A: Sensor calibration
Code No. C2002: Valve calibration not completed
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-36
Code No. C1608 EEPROM fail . . . . . . . . . .
35B-37
Code No.C1707: Implausible coding data . .
35B-39
Code No. C2204 Sensor cluster internal error
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-40
Code No. U0114 4WD CAN timeout
Code No. U0141 ETACS CAN timeout . . . .
35B-40
Code No. U1073 Bus-off . . . . . . . . . . . . . . .
35B-41
35B-2
Code No. U1195 Coding not completed
Code No. U1197 Coding data unavailable .
35B-42
Inspection Procedure 10: The initial check sound of
hydraulic unit is loud. . . . . . . . . . . . . . . . . . . 35B-54
TROUBLE SYMPTOM CHART. . . . . . . . . .
35B-43
DATA LIST REFERENCE TABLE . . . . . . . .
35B-54
SYMPTOM PROCEDURES . . . . . . . . . . . .
35B-44
ACTUATOR TEST REFERENCE TABLE . .
35B-55
CHECK AT ECU TERMINALS . . . . . . . . . .
35B-56
Inspection Procedure 1: M.U.T.-III cannot
communication only with ABS-ECU. . . . . . .
35B-44
Inspection Procedure 2: Brake warning lamp stays ON
with the parking brake lever released. . . . .
35B-44
Inspection Procedure 3: ABS warning lamp does not
illuminate when ignition switch is turned to the ON
position (engine stopped).. . . . . . . . . . . . . .
35B-46
Inspection Procedure 4: Brake warning lamp does not
illuminate when the ignition switch is turned to ON
position (Engine stopped). . . . . . . . . . . . . .
35B-47
Inspection Procedure 5: ABS warning lamp stays ON
after the engine is started.. . . . . . . . . . . . . .
35B-48
Inspection Procedure 6: Abnormality in brake operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-49
ON-VEHICLE SERVICE . . . . . . . . . . . 35B-58
WHEEL SPEED SENSOR OUTPUT CURRENT
MEASUREMENT. . . . . . . . . . . . . . . . . . . . . 35B-58
HYDRAULIC UNIT CHECK . . . . . . . . . . . . .
35B-59
IN THE EVENT OF A DISCHARGED BATTERY
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-61
HYDRAULIC UNIT . . . . . . . . . . . . . . . 35B-61
REMOVAL AND INSTALLATION . . . . . . . .
35B-61
WHEEL SPEED SENSOR . . . . . . . . . 35B-63
Inspection Procedure 7: ABS system inoperative
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35B-50
REMOVAL AND INSTALLATION <FRONT>
......................................
35B-63
Inspection Procedure 8: ABS-ECU power supply circuit
system. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35B-51
REMOVAL AND INSTALLATION <REAR>.
35B-65
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
35B-67
INSPECTION PROCEDURE 9: ABS operates too
frequently. . . . . . . . . . . . . . . . . . . . . . . . . . .
35B-53
ANTI-SKID BRAKING SYSTEM (ABS)
35B-3
SERVICE SPECIFICATIONS
SERVICE SPECIFICATIONS
M1352000300964
Item
Standard value
Wheel speed sensor current mA
5.9 − 8.4 or 11.8 − 16.8
Wheel speed sensor insulation resistance MΩ
5 or more
SPECIAL TOOLS
M1352000601883
Tool
a
MB992744
b
MB992745
c
DO NOT USE
MB992746
d
MB992747
e
MB992748
ACB05421AB
Number
Name
Use
a. MB992744
b. MB992745
c. MB992746
d. MB992747
e. MB992748
ABS check (Diagnosis
a. Vehicle
code display and data list
communication
display by M.U.T.-III)
interface-Lite
(V.C.I.-Lite)
b. V.C.I.-Lite main
harness A (for vehicles
with CAN
communication)
c. V.C.I.-Lite main
harness B (for vehicles
without CAN
communication)
d. V.C.I.-Lite USB cable
short
e. V.C.I.-Lite USB cable
long
ANTI-SKID BRAKING SYSTEM (ABS)
35B-4
SPECIAL TOOLS
Tool
a
MB991824
b
Number
Name
Use
MB991955
a. MB991824
b. MB991827
c. MB991910
d. MB991911
e. MB991825
f. MB991826
M.U.T.-III sub-assembly
a. Vehicle
Communication
Interface (V.C.I.)
b. M.U.T.-III USB cable
c. M.U.T.-III main
harness A (Vehicles
with CAN
communication
system)
d. M.U.T.-III main
harness B (Vehicles
without CAN
communication
system)
e. M.U.T.-III
measurement adapter
f. M.U.T.-III trigger
harness
CAUTION
For vehicles with CAN
communication, use the
M.U.T.-III main harness
A to send the simulated
vehicle speed. If you
connect the M.U.T.-III
main harness B instead,
the CAN
communication does
not function correctly.
ABS check (Diagnosis
code display and data list
display by M.U.T.-III)
MB992006
Extra fine probe
Continuity check and
voltage measurement at
harness wire or connector
for loose, corroded or
damaged terminals, or
terminals pushed back in
the connector.
MB991709
Wiring harness set
Checking the ABS-ECU
and output current
measure at the wheel
speed sensor
MB991827
c
MB991910
d
DO NOT USE
MB991911
e
MB991825
f
MB991826
MB991955
MB992006
ANTI-SKID BRAKING SYSTEM (ABS)
35B-5
TROUBLESHOOTING
TROUBLESHOOTING
DIAGNOSIS TROUBLESHOOTING FLOW
NOTES WITH REGARD TO DIAGNOSIS
M1352011100997
Refer to GROUP 00 − How to Use Troubleshooting/Contents of Troubleshooting .
M1352012600393
1. The ABS is a system which controls the brake
pressure by means of the operation of the ECU.
Accordingly, the following symptoms may occur at
times, but these are a sign of normal ABS
operation, and do not indicate a malfunction.
Phenomenon
Explanation of phenomenon
When the engine starts, a knocking sound can be heard coming This sound occurs as a result of system
from the engine compartment.
operation checking, and is not a
malfunction.
• Sound of the motor inside the ABS hydraulic unit operation.
(whine)
• Sound is the generated along with vibration of the brake
pedal. (scraping)
• When ABS operates, sound is generated from the vehicle
chassis due to repeated brake application and release.
(Thump: suspension; squeak: tyres)
This is the sound of normal system
operation, and is not a malfunction.
Shocks are felt if the brake pedal is depressed when driving at
low speed.
This is due to system operation checking
(starting-of check when the vehicle speed
reaches a certain number of km/h) and is
not a malfunction.
2. For road surfaces such as snow-covered roads
and gravel roads, the braking distance for
vehicles with ABS can sometimes be longer than
that for other vehicles. Accordingly, advise the
customer to drive safely on such roads by
lowering the vehicle speed and not being too
overconfident.
3. Diagnosis detection condition can vary depending
on the diagnosis code. Make sure that checking
requirements listed in the "Comment" are satisfied
when checking the trouble symptom again.
ABS warning lamp
ABS WARNING LAMP AND BRAKE
WARNING LAMP CHECK
Approximately 3s
M1352012001316
Check that ABS and brake warning lamps illuminate
as follows.
NOTE: The EBD warning lamp is also used as the
brake warning lamp.
Brake warning lamp
ABS warning
lamp, Brake
warning lamp
Illuminated
Not
illuminated
START
Ignition switch
ON
ACC,
LOCK
ACC00028AB
1. When the ignition switch is turned to the ON
position, ABS and brake warning lamps illuminate.
2. The ABS and brake warning lamps illuminate for
three seconds*1 and then turn OFF*2.
3. Otherwise, check the diagnosis code.
ANTI-SKID BRAKING SYSTEM (ABS)
35B-6
TROUBLESHOOTING
NOTE: .
• *1: The ABS warning lamp may stay ON until the
vehicle speed reaches 10 km/h. As far as
ABS-ECU stores any diagnosis code related to
the wheel speed sensor malfunction or the motor
malfunction as past trouble, ABS-ECU continues
illuminating the ABS warning lamp until it verifies
that the malfunction for that code is resolved
(startup check).
• *2: The brake warning lamp does not turn OFF
when the parking brake is applied or the brake
fluid level is lowered.
DIAGNOSTIC FUNCTION
M1352011201726
ABS-ECU has the following functions for easier system checks. The following items can be diagnosed
using M.U.T-III.
• Diagnosis code set (Refer to P.35B-11).
• Service data output (Refer to P.35B-54).
• Actuator test (Refer to P.35B-55).
• Freeze frame data output (Refer to ).
CHECK OF FREEZE FRAME DATA
The freeze frame data can be checked by using the
M.U.T.-III.
Display item list
Item No.
Item name
When detecting fault and storing the diagnosis code,
the ECU connected to CAN bus line obtains the data
before the determination of the diagnosis code and
the data when the diagnosis code is determined, and
then stores the ECU status of that time. By analysing
each data from M.U.T.-III, the troubleshooting can be
performed more efficiently. The displayed items are
as the table below.
Data item
Unit
km
1
Odometer
Total driving distance after the diagnosis code is
generated
2
Ignition cycle
Number of times the ignition switch is turned "ON" or Number of
"LOCK (OFF)" after the past failure transition
counts is
displayed.
5
Power supply
voltage
Voltage of power supply when the diagnosis code is V
generated
9
G sensor
G sensor value when a diagnosis code is set
13
Stop lamp switch
Stop light switch condition when the diagnosis code −
is generated :OFF/ON
21
Pump motor
Pump motor status (ON/OFF) when a diagnosis
code is set
−
301
ABS control
ABS control when the diagnosis code is generated
:OFF/ON
−
401
FL wheel speed
sensor
Wheel speed (FL) when the diagnosis code is
generated
km/h
402
FR wheel speed
sensor
Wheel speed (FR) when the diagnosis code is
generated
km/h
G
ANTI-SKID BRAKING SYSTEM (ABS)
35B-7
TROUBLESHOOTING
Item No.
Item name
Data item
Unit
403
RL wheel speed
sensor
Wheel speed (RL) when the diagnosis code is
generated
km/h
404
RR wheel speed
sensor
Wheel speed (RR) when the diagnosis code is
generated
km/h
FAIL-SAFE FUNCTION
If any malfunction is detected by the self-diagnostic
function, ABS-ECU illuminates the ABS warning
lamp and brake warning lamp*, and it disables ABS
and EBD control.
NOTE: *: The brake warning lamp and display are
used as EBD control warning lamp.
Illumination condition of warning lamp and display in case of failure
Diagno Item
Countermeasures for failure
sis
Brake
Brake
code
warning lamp warning
No.
display
C100A
FL wheel speed sensor circuit
C1015
FR wheel speed sensor circuit
C1020
RL wheel speed sensor circuit
C102B
RR wheel speed sensor circuit
C1011
FL wheel speed sensor signal
C101C
FR wheel speed sensor signal
C1027
RL wheel speed sensor signal
C1032
RR wheel speed sensor signal
C1014
FL wheel speed sensor
performance
C101F
FR wheel speed sensor
performance
C102A
RL wheel speed sensor
performance
C1035
RR wheel speed sensor
performance
C1041
FL wheel speed tone
performance
C1042
FR wheel speed tone
performance
C1043
RL wheel speed tone
performance
C1044
RR wheel speed tone
performance
C1046
FL wheel speed sensor phase
C1047
FR wheel speed sensor phase
C1048
RL wheel speed sensor phase
C1049
RR wheel speed sensor phase
ABS warning ABS warning
lamp
display
OFF*1
OFF*1
ON*2
ON*2
OFF*1
OFF*1
ON*2
ON*2
OFF*1
OFF*1
ON*2
ON*2
OFF*1
OFF*1
ON*2
ON*2
OFF*1
OFF*1
ON*2
ON*2
ANTI-SKID BRAKING SYSTEM (ABS)
35B-8
TROUBLESHOOTING
Diagno
sis
code
No.
Item
C104B
FL inlet valve
C104F
FR inlet valve
C1053
RL inlet valve
C1057
RR inlet valve
C105F
FL outlet valve
C1063
FR outlet valve
C1067
RL outlet valve
C105B
RR outlet valve
C2104
Countermeasures for failure
Brake
Brake
warning lamp warning
display
ABS warning ABS warning
lamp
display
ON
ON
ON
ON
ON
ON
ON
ON
Valve power supply circuit
ON
ON
ON
ON
C1073
Motor drive circuit
OFF
OFF
ON*2
ON*2
C2116
Pump motor voltage low
OFF
OFF
ON*2
ON*2
C1000
Brake SW (stuck)
OFF
OFF
OFF
OFF
C2200
ECU internal error
ON*3
ON*3
ON*3
ON*3
C2101
Power supply
high voltage
ON
ON
ON
ON
C1395
Incomplete Brake fluid filling*6
OFF
OFF
Flashes (2 Hz) ON
C1210
Longitudinal G sensor input
circuit*4
OFF
OFF
ON
ON
C1242
Longitudinal G sensor signal*4
OFF
OFF
ON
ON
C123A
Sensor calibration*4
OFF
OFF
ON
ON
C1608
EEPROM fail
OFF
OFF
OFF
OFF
C1707
Implausible coding data
OFF
OFF
ON
ON
C2002
Valve calibration not completed OFF
OFF
ON
ON
C2204
Sensor cluster internal error*4
OFF
OFF
ON
ON
U0114
4WD CAN timeout
OFF
OFF
OFF
OFF
U0141
ETACS CAN timeout
OFF
OFF
OFF
OFF
U1073
Bus-off
OFF
OFF
OFF
OFF
U1195
Coding not completed
OFF
OFF
ON
ON
U1197
Coding data unavailable
OFF
OFF
ON
ON
18.0 ± 1.0 V or
more
NOTE: .
•
*1
•
*2
:Stays ON until the vehicle speed reaches 10 km/h when the ignition switch is turned to ON next time,
even if the malfunction is repaired and returns to normal condition.
•
*3
:May not illuminate depending on the trouble cause.
•
*4
:4WD
:Turns ON when two or more wheels are faulty.
ANTI-SKID BRAKING SYSTEM (ABS)
35B-9
TROUBLESHOOTING
Under EBD and ABS control in case of failure
Diagno Item
Countermeasures for failure
sis
EBD control
ABS control
code
No.
C100A
FL wheel speed sensor circuit
Executed*1
Prohibited
C1015
FR wheel speed sensor circuit
C1020
RL wheel speed sensor circuit
C102B
RR wheel speed sensor circuit
C1011
FL wheel speed sensor signal
Executed*1
Prohibited
C101C
FR wheel speed sensor signal
C1027
RL wheel speed sensor signal
C1032
RR wheel speed sensor signal
C1014
FL wheel speed sensor
performance
Executed*1
Prohibited
C101F
FR wheel speed sensor
performance
C102A
RL wheel speed sensor
performance
C1035
RR wheel speed sensor
performance
C1041
FL wheel speed tone
performance
Executed*1
Prohibited
C1042
FR wheel speed tone
performance
C1043
RL wheel speed tone
performance
C1044
RR wheel speed tone
performance
C1046
FL wheel speed sensor phase
Executed*1
Prohibited
C1047
FR wheel speed sensor phase
C1048
RL wheel speed sensor phase
C1049
RR wheel speed sensor phase
C104B
FL inlet valve
Prohibited
Prohibited
C104F
FR inlet valve
C1053
RL inlet valve
C1057
RR inlet valve
C105F
FL outlet valve
Prohibited
Prohibited
C1063
FR outlet valve
C1067
RL outlet valve
C105B
RR outlet valve
C2104
Valve power supply circuit
Prohibited
Prohibited
C1073
Motor drive circuit
Executed
Prohibited
C2116
Pump motor voltage low
Executed
Prohibited
ANTI-SKID BRAKING SYSTEM (ABS)
35B-10
TROUBLESHOOTING
Diagno Item
sis
code
No.
Countermeasures for failure
EBD control
ABS control
C1000
Brake SW (stuck)
Executed
Executed
C2200
ECU internal error
Prohibited*2
Prohibited*2
C2101
Power supply
high voltage
Prohibited
Prohibited
C1395
Incomplete Brake fluid filling
Executed
Executed
C1210
Longitudinal G sensor input
circuit*3
Executed
Prohibited
C1242
Longitudinal G sensor signal*3
Executed
Prohibited
C123A
Sensor calibration*3
Executed
Prohibited
C1608
EEPROM fail
Executed
Executed
C1707
Implausible coding data
Executed
Prohibited
C2002
Valve calibration not completed Executed
Prohibited
C2204
Sensor cluster internal error*3
Executed
Prohibited
U0114
4WD CAN timeout
Executed
Executed
U0141
ETACS CAN timeout
Executed
Executed
U1073
Bus-off
Executed
Executed
U1195
Coding not completed
Executed
Prohibited
U1197
Coding data unavailable
Executed
Prohibited
18.0 ± 1.0 V or
more
NOTE: .
•
*1:
•
*2
•
*3:
Prohibited when two or more wheels are faulty.
: Not prohibited when the brake warning lamp is not ON.
4WD
HOW TO READ DIAGNOSIS CODE
CAUTION
When reading a diagnosis code, be sure to read
it after erasing once because the diagnosis code
could be set as a past trouble.
Refer to GROUP 00 − How to Use Troubleshooting
and Inspection Service Points .
HOW TO ERASE DIAGNOSIS CODE
Refer to GROUP 00 − How to Use Troubleshooting
and Inspection Service Points .
ANTI-SKID BRAKING SYSTEM (ABS)
35B-11
TROUBLESHOOTING
DIAGNOSIS CODE CHART
M1352011301949
CAUTION
During diagnosis, a diagnosis code associated with other system may be set when the ignition switch
is turned on with connector(s) disconnected. On completion, confirm all systems for diagnosis
code(s). If diagnosis code(s) are set, erase them all.
Diagnosis code Item
No.
Reference page
C100A
FL wheel speed sensor circuit
P.35B-12
C1015
FR wheel speed sensor circuit
C1020
RL wheel speed sensor circuit
C102B
RR wheel speed sensor circuit
C1011
FL wheel speed sensor signal
C101C
FR wheel speed sensor signal
C1027
RL wheel speed sensor signal
C1032
RR wheel speed sensor signal
C1014
FL wheel speed sensor .performance
C101F
FR wheel speed sensor performance
C102A
RL wheel speed sensor performance
C1035
RR wheel speed sensor performance
C1041
FL wheel speed tone performance
C1042
FR wheel speed tone performance
C1043
RL wheel speed tone performance
C1044
RR wheel speed tone performance
C1046
FL wheel speed sensor phase
C1047
FR wheel speed sensor phase
C1048
RL wheel speed sensor phase
C1049
RR wheel speed sensor phase
C104B
FL inlet valve
C104F
FR inlet valve
C1053
RL inlet valve
C1057
RR inlet valve
C105F
FL outlet valve
C1063
FR outlet valve
C1067
RL outlet valve
C105B
RR outlet valve
C2104
Valve power supply circuit
P.35B-27
C1073
Motor drive circuit
P.35B-29
C2116
Pump motor voltage low
P.35B-30
C1000
Brake SW (stuck)
P.35B-32
C2200
ECU internal error
P.35B-33
C2101
Power supply high voltage
P.35B-15
P.35B-18
P.35B-21
P.35B-23
P.35B-26
18.0 ± 1.0 V or more
P.35B-33
ANTI-SKID BRAKING SYSTEM (ABS)
35B-12
TROUBLESHOOTING
Diagnosis code Item
No.
Reference page
C1395
Incomplete Brake fluid filling
P.35B-34
C1210
Longitudinal G sensor input
circuit <4WD>
Abnormality in output voltage
P.35B-34
C1242
Longitudinal G sensor signal
<4WD>
Abnormality in output voltage
P.35B-35
C123A
Sensor calibration <4WD>
C2002
Valve calibration not completed
C1608
EEPROM fail
P.35B-37
C1707
Implausible coding data
P.35B-39
C2204
Sensor cluster internal error <4WD>
P.35B-40
U0114
4WD CAN timeout
P.35B-40
U0141
ETACS CAN timeout
U1073
Bus-off
P.35B-41
U1195
Coding not completed
P.35B-42
U1197
Coding data unavailable
P.35B-36
DIAGNOSIS CODE PROCEDURES
Code No. C100A FL wheel speed sensor circuit
Code No. C1015 FR wheel speed sensor circuit
Code No. C1020 RL wheel speed sensor circuit
Code No. C102B RR wheel speed sensor circuit
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C − CAN Bus Diagnostics Table ).
OPERATION
• The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which
north and south pole sides of the magnets are
arranged alternately) for detecting the wheel
speed which rotates at the same speed of the
wheels and wheel speed sensors. This sensor
outputs frequency pulse signals in proportion to
the wheel speed.
• The pulse signals, which the wheel speed sensor
creates, are sent to ABS-ECU. ABS-ECU uses
the frequency of the pulse signals to determine
the wheel speed.
DIAGNOSIS CODE SET CONDITIONS
ABS-ECU monitors the voltage fluctuation in each
wheel speed sensor circuit. If ABS-ECU detects the
open or short circuit in the circuit, it will set a diagnosis code.
PROBABLE CAUSES
Current trouble
• Damaged wiring harness and connectors
• Noise interference
• Malfunction of wheel speed sensor
• ABS-ECU malfunction
Past trouble
• Carry out diagnosis with particular emphasis on
wiring harness and connector failures between
ABS-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (GROUP 00 − How to Use
Troubleshooting/How to Treat Past Trouble ).
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code C100A, C1015, C1020 or
C102B set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. M.U.T.-III data list
Check the following data list (Refer to P.35B-54).
• Item No.01: FL wheel speed sensor
• Item No.02: FR wheel speed sensor
• Item No.03: RL wheel speed sensor
• Item No.04: RR wheel speed sensor
Q: Is the check result normal?
YES : Go to Step 10.
NO : Go to Step 4.
35B-13
Code No.C100A is set
• Measure the voltage between the ABS-ECU
connector (FL+ terminal) and the body earth,
and between the ABS-ECU connector (FLterminal) and the body earth.
OK: 1 V or less
Code No.C1015 is set
• Measure the voltage between the ABS-ECU
connector (FR+ terminal) and the body earth,
and between the ABS-ECU connector (FRterminal) and the body earth.
OK: 1 V or less
Code No.C1020 is set
• Measure the voltage between the ABS-ECU
connector (RL+ terminal) and the body earth,
and between the ABS-ECU connector (RLterminal) and the body earth.
OK: 1 V or less
Code No.C102B is set
• Measure the voltage between the ABS-ECU
connector (RR+ terminal) and the body earth,
and between the ABS-ECU connector (RRterminal) and the body earth.
OK: 1 V or less
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 6.
STEP 4. Voltage measurement at the ABS-ECU
connector (FL+, FL-, FR+, FR-, RL+, RL-, RR+,
RR- terminal)
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the ON position.
STEP 5. Resistance measurement at ABS-ECU
connector (FL+, FL-, FR+, FR-, RL+, RL-, RR+,
RR- terminal)
Disconnect the connector, and measure at the wiring
harness side.
Code No.C100A is set
• Measure the resistance between the ABS-ECU
connector (FL+ terminal) and the body earth, and
between the ABS-ECU connector (FL- terminal)
and the body earth.
OK: No continuity
Code No.C1015 is set
• Measure the resistance between the ABS-ECU
connector (FR+ terminal) and the body earth, and
between the ABS-ECU connector (FR- terminal)
and the body earth.
OK: No continuity
Code No.C1020 is set
• Measure the resistance between the ABS-ECU
connector (RL+ terminal) and the body earth, and
between the ABS-ECU connector (RL- terminal)
and the body earth.
OK: No continuity
Code No.C102B is set
• Measure the resistance between the ABS-ECU
connector (RR+ terminal) and the body earth,
and between the ABS-ECU connector (RR- terminal) and the body earth.
OK: No continuity
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
35B-14
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 6. Check the wiring harness between the
ABS-ECU connector terminal and the wheel
speed sensor connector terminal.
Code No.C100A is set
• Check of short circuit in FL+, FL- line between
ABS-ECU connector and front wheel speed sensor (LH) connector.
Code No.C1015 is set
• Check of short circuit in FR+, FR- line between
ABS-ECU connector and front wheel speed sensor (RH) connector.
Code No.C1020 is set
• Check of short circuit in RL+, RL- line between
ABS-ECU connector and rear wheel speed sensor (LH) connector.
Code No.C102B is set
• Check of short circuit in RR+, RR- line between
ABS-ECU connector and rear wheel speed sensor (LH) connector.
Q: Is the check result normal?
YES : Replace the wheel speed sensor (Refer to
P.35B-63 <front> or P.35B-65 <rear>).
Then go to Step 11.
NO : Repair the connector(s) or wiring harness.
Then go to Step 11.
STEP 7. Resistance measurement at the
ABS-ECU connector (FL+, FL-, FR+, FR-, RL+,
RL-, RR+, RR- terminal)
Disconnect the connector, and measure at the wiring
harness side.
Code No.C100A is set
• Measure the resistance between the ABS-ECU
connector (FL+ terminal) and the ABS-ECU connector (FL- terminal).
OK: Continuity
Code No.C1015 is set
• Measure the resistance between the ABS-ECU
connector (FR+ terminal) and the ABS-ECU connector (FR- terminal).
OK: Continuity
Code No.C1020 is set
• Measure the resistance between the ABS-ECU
connector (RL+ terminal) and the ABS-ECU connector (RL- terminal).
OK: Continuity
Code No.C102B is set
• Measure the resistance between the ABS-ECU
connector (RR+ terminal) and the ABS-ECU connector (RR- terminal).
OK: Continuity
Q: Is the check result normal?
YES : Go to Step 8.
NO : Go to Step 10.
STEP 8. Check the wiring harness between the
ABS-ECU connector terminal and the wheel
speed sensor connector terminal.
Code No.C100A is set
• Check of open circuit in FL+, FL- line between
ABS-ECU connector and front wheel speed sensor (LH) connector.
Code No.C1015 is set
• Check of open circuit in FR+, FR- line between
ABS-ECU connector and front wheel speed sensor (RH) connector.
Code No.C1020 is set
• Check of open circuit in RL+, RL- line between
ABS-ECU connector and rear wheel speed sensor (LH) connector.
Code No.C102B is set
• Check of open circuit in RR+, RR- line between
ABS-ECU connector and rear wheel speed sensor (RH) connector.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Repair the connector(s) or wiring harness.
Then go to Step 11.
STEP 9. Check for wheel speed sensor as a
single unit
Refer to P.35B-67.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Replace the wheel speed sensor (Refer to
P.35B-63 <front> or P.35B-65 <rear>).
Then go to Step 11.
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code C100A, C1015, C1020 or
C102B set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 11.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
35B-15
STEP 11. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code C100A, C1015, C1020 or
C102B set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1011 FL wheel speed sensor signal
Code No. C101C FR wheel speed sensor signal
Code No. C1027 RL wheel speed sensor signal
Code No. C1032 RR wheel speed sensor signal
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C − CAN Bus Diagnostics Table ).
OPERATION
• The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which
north and south pole sides of the magnets are
arranged alternately) for detecting the wheel
speed which rotates at the same speed of the
wheels and wheel speed sensors. This sensor
outputs frequency pulse signals in proportion to
the wheel speed.
• The pulse signals, which the wheel speed sensor
creates, are sent to ABS-ECU. ABS-ECU uses
the frequency of the pulse signals to determine
the wheel speed.
DIAGNOSIS CODE SET CONDITIONS
ABS-ECU monitors the signals from each wheel
speed sensor while the vehicle is being driven. If any
fault below is found in these sensor signals,
ABS-ECU will set the relevant diagnosis code.
• Irregular change in the wheel speed sensor signal
• Wheel speed sensor signal continuously indicates high value.
PROBABLE CAUSES
Current trouble
• Excessive gap between the wheel speed sensor
and the wheel speed detection encoder
• Adhesion of foreign materials on the wheel speed
sensor
• Adhesion of foreign materials on the wheel speed
detection encoder
• Wheel bearing malfunction
• Malfunction of wheel speed sensor
• Damaged wiring harness and connectors
• External noise interference
• Improper installation of the wheel speed sensor
• Deformation of the wheel speed detection
encoder
• ABS-ECU malfunction
• Disturbance of magnetisation pattern for wheel
speed detection encoder
• The number of poles on the magnetic encoder for
wheel speed detection (the number of N-pole and
S-pole) is changed.
Past trouble
• When the diagnosis code No. C100A, C1015,
C1020 or C102B is also set, carry out diagnosis
with particular emphasis on wiring harness and
connector failures between ABS-ECU and the
wheel speed sensor. For diagnosis procedures,
refer to How to treat past trouble (GROUP 00 −
How to Use Troubleshooting/How to Treat Past
Trouble ).
• When the diagnosis code No. C100A, C1015,
C1020 or C102B is not set, the following conditions may be present:
• Some wheels slip
• Unstable vehicle attitude
• External noise interference
• Vehicle ran with the parking brake applied.
35B-16
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C1011, C101C, C1027 or
C1032 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. M.U.T.-III diagnosis code
Check that the diagnosis code No. C100A, C1015,
C1020 or C102B is also set.
Q: Is the diagnosis code No.C100A, C1015, C1020 or
C102B also set?
YES : Perform the diagnosis for the diagnosis
code No.C100A, C1015, C1020 or C102B
(Refer to P.35B-12).
NO : Go to Step 4.
STEP 4. Check the wiring harness between the
ABS-ECU connector terminal and the wheel
speed sensor connector terminal
Code No.C1011 is set
• Check of short to power supply, short to earth,
and open circuit in FL+, FL− line between
ABS-ECU connector and front wheel speed sensor (LH) connector.
Code No.C101C is set
• Check of short to power supply, short to earth,
and open circuit in FR+, FR− line between
ABS-ECU connector and front wheel speed sensor (RH) connector.
Code No.C1027 is set
• Check of short to power supply, short to earth,
and open circuit in RL+, RL− line between
ABS-ECU connector and rear wheel speed sensor (LH) connector.
Code No.C1032 is set
• Check of short to power supply, short to earth,
and open circuit in RR+, RR− line between
ABS-ECU connector and rear wheel speed sensor (RH) connector.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the connector(s) or wiring harness.
Then go to Step 11.
STEP 5. Check for wheel speed sensor
installation
Check how the wheel speed sensor is installed (Disconnection of wheel speed sensor, loose mounting
bolt, etc.).
Q: Is the check result normal?
YES : Go to Step 6.
NO : Reinstall the wheel speed sensor correctly
(Refer to P.35B-63 <front> or P.35B-65
<rear>). Then go to Step 6.
STEP 6. Check for wheel speed sensor output
current
Refer to P.35B-58.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the wheel speed sensor (Refer to
P.35B-63 <front> or P.35B-65 <rear>).
Then go to Step 10.
ANTI-SKID BRAKING SYSTEM (ABS)
35B-17
TROUBLESHOOTING
STEP 7. Check for wheel bearing looseness
NOTE: Loose wheel bearing may increase the gap
between the wheel speed sensor and the wheel
speed detection magnet encoder. Check the wheel
bearing for looseness. <Refer to GROUP 26 − Wheel
Bearing Axial Play Check . (front), GROUP 27A −
Wheel Bearing Axial Play Check (rear-2WD) or
GROUP 27B − Wheel Bearing Axial Play Check
(rear-4WD)>
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the wheel bearing <front> or rear
wheel hub assembly <rear>. <Refer to
GROUP 26 − Front Axle Hub Assembly
(front), GROUP 27A − Rear Axle Hub
Assembly (rear-2WD) or GROUP 27B −
Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 11.
STEP 8. Check of wheel speed detection encoder
<Front>
Oil seal
Wheel
bearing
Magnetic
encoder
AC504925 AD
<Rear>
<2WD>
Ball bearing
Rear hub
assembly
Magnetic
encoder
<4WD>
Rear wheel bearing
Magnetic
encoder
Rear hub
assembly
AC808708 AC
Check the encoder for adhesion of foreign materials
or deformation.
Q: Is the check result normal?
YES : Go to Step 9.
NO (Adhesion of foreign materials) : Remove the
foreign materials and clean the encoder so
as not to disturb the magnetization pattern
on it while taking care of the magnet,
magnetic substance, and magnetic
attraction. Then go to Step 11.
NO (Deformation) : Replace the wheel bearing
<front> or rear wheel hub assembly <rear>.
<Refer to GROUP 26 − Front Axle Hub
Assembly (front), GROUP 27A − Rear Axle
Hub Assembly (rear-2WD) or GROUP 27B
− Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 11.
35B-18
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 9. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1011, C101C, C1027 or
C1032 set?
YES : Replace the wheel speed sensor (Refer to
P.35B-63 <front> or P.35B-65 <rear>).
Then go to Step 10.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1011, C101C, C1027 or
C1032 set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 11.
NO : This diagnosis is complete.
STEP 11. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1011, C101C, C1027 or
C1032 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1014 FL wheel speed sensor performance
Code No. C101F FR wheel speed sensor performance
Code No. C102A RL wheel speed sensor performance
Code No. C1035 RR wheel speed sensor performance
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C − CAN Bus Diagnostics Table ).
OPERATION
• The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which
north and south pole sides of the magnets are
arranged alternately) for detecting the wheel
speed which rotates at the same speed of the
wheels and wheel speed sensors. This sensor
outputs frequency pulse signals in proportion to
the wheel speed.
• The pulse signals, which the wheel speed sensor
creates, are sent to ABS-ECU. ABS-ECU uses
the frequency of the pulse signals to determine
the wheel speed.
DIAGNOSIS CODE SET CONDITIONS
ABS-ECU monitors the signals from each wheel
speed sensor while the vehicle is being driven. If any
fault below is found in these sensor signals,
ABS-ECU will set the relevant diagnosis code.
• Missing wheel speed sensor signal
• Wheel speed sensor signal continuously indicates low value than the other wheel speed sensor signals.
PROBABLE CAUSES
Current trouble
• Excessive gap between the wheel speed sensor
and the magnetic encoder for wheel speed detection
• Wheel bearing malfunction
• Deformation of the magnetic encoder for wheel
speed detection
• Adhesion of foreign materials on the wheel speed
sensor
• Adhesion of foreign materials on the magnetic
encoder for wheel speed detection
• Malfunction of wheel speed sensor
• Improper installation of the wheel speed sensor
• ABS-ECU malfunction
• Disturbance of magnetization pattern for magnetic encoder for wheel speed detection
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
• The number of poles on the magnetic encoder for
wheel speed detection (the number of N-pole and
S-pole) is changed.
Past trouble
• When the diagnosis code No. C100A, C1015,
C1020 or C102B is also set, carry out diagnosis
with particular emphasis on wiring harness and
connector failures between ABS-ECU and the
wheel speed sensor. For diagnosis procedures,
refer to How to treat past trouble (GROUP 00 −
How to Use Troubleshooting/How to Treat Past
Trouble ).
• When the diagnosis code No. C100A, C1015,
C1020 or C102B is not set, the following conditions may be present:
• Some wheels slip.
• Unstable vehicle attitude
• External noise interference
• Vehicle ran with the parking brake applied.
• Only two wheels are rotated on a drum tester.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C1014, C101F, C102A or
C1035 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. M.U.T.-III diagnosis code
Check that the diagnosis code No.C100A, C1015,
C1020 or C102B is also set.
Q: Is the diagnosis code No.C100A, C1015, C1020 or
C102B also set?
YES : Perform the diagnosis for the diagnosis
code No.C100A, C1015, C1020 or C102B
(Refer to P.35B-12).
NO : Go to Step 4.
35B-19
STEP 4. Check the wiring harness between the
ABS-ECU connector terminal and the wheel
speed sensor connector terminal
Code No.C1014 is set
• Check of short to power supply, short to earth,
and open circuit in FL+, FL− line between
ABS-ECU connector and front wheel speed sensor (LH) connector.
Code No.C101F is set
• Check of short to power supply, short to earth,
and open circuit in FR+, FR− line between
ABS-ECU connector and front wheel speed sensor (RH) connector.
Code No.C102A is set
• Check of short to power supply, short to earth,
and open circuit in RL+, RL− line between
ABS-ECU connector and rear wheel speed sensor (LH) connector.
Code No.C1035 is set
• Check of short to power supply, short to earth,
and open circuit in RR+, RR− line between
ABS-ECU connector and rear wheel speed sensor (RH) connector.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the connector(s) or wiring harness.
Then go to Step 11.
STEP 5. Check for wheel speed sensor
installation
Check how the wheel speed sensor is installed (Disconnection of wheel speed sensor, loose mounting
bolt, etc.).
Q: Is the check result normal?
YES : Go to Step 6.
NO : Reinstall the wheel speed sensor correctly
(Refer to P.35B-63 <front> or P.35B-65
<rear>). Then go to Step 6.
STEP 6. Check for wheel speed sensor output
current
Refer to P.35B-58.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the wheel speed sensor (Refer to
P.35B-63 <front> or P.35B-65 <rear>).
Then go to Step 10.
35B-20
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 7. Check for wheel bearing looseness
NOTE: Loose wheel bearing may increase the gap
between the wheel speed sensor and the wheel
speed detection magnet encoder. Check the wheel
bearing for looseness. <Refer to GROUP 26 − Wheel
Bearing Axial Play Check . (front), GROUP 27A −
Wheel Bearing Axial Play Check (rear-2WD) or
GROUP 27B − Wheel Bearing Axial Play Check
(rear-4WD)>
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the wheel bearing <front> or rear
wheel hub assembly <rear>. <Refer to
GROUP 26 − Front Axle Hub Assembly
(front), GROUP 27A − Rear Axle Hub
Assembly (rear-2WD) or GROUP 27B −
Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 11.
STEP 8. Check of wheel speed detection encoder
<Front>
Oil seal
Wheel
bearing
Magnetic
encoder
AC504925 AD
<Rear>
<2WD>
Ball bearing
Rear hub
assembly
Magnetic
encoder
<4WD>
Rear wheel bearing
Magnetic
encoder
Rear hub
assembly
AC808708 AC
Check the encoder for adhesion of foreign materials
or deformation.
Q: Is the check result normal?
YES : Go to Step 9.
NO (Adhesion of foreign materials) : Remove the
foreign materials and clean the encoder so
as not to disturb the magnetisation pattern
on it while taking care of the magnet,
magnetic substance, and magnetic
attraction. Then go to Step 11.
NO (Deformation) : Replace the wheel bearing
<front> or rear wheel hub assembly <rear>.
<Refer to GROUP 26 − Front Axle Hub
Assembly (front), GROUP 27A − Rear Axle
Hub Assembly (rear-2WD) or GROUP 27B
− Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 11.
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 9. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1014, C101F, C102A or
C1035 set?
YES : Replace the wheel speed sensor (Refer to
P.35B-63 <front> or P.35B-65 <rear>).
Then go to Step 10.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
35B-21
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1014, C101F, C102A or
C1035 set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 11.
NO : This diagnosis is complete.
STEP 11. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1014, C101F, C102A or
C1035 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1041 FL wheel speed tone performance
Code No. C1042 FR wheel speed tone performance
Code No. C1043 RL wheel speed tone performance
Code No. C1044 RR wheel speed tone performance
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C − CAN Bus Diagnostics Table ).
OPERATION
• The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which
north and south pole sides of the magnets are
arranged alternately) for detecting the wheel
speed which rotates at the same speed of the
wheels and wheel speed sensors. This sensor
outputs frequency pulse signals in proportion to
the wheel speed.
• The pulse signals, which the wheel speed sensor
creates, are sent to ABS-ECU. ABS-ECU uses
the frequency of the pulse signals to determine
the wheel speed.
DIAGNOSIS CODE SET CONDITIONS
ABS-ECU monitors the signals from each wheel
speed sensor while the vehicle is being driven. If any
periodical drop is found in these sensor signals,
ABS-ECU will set the relevant diagnosis code.
PROBABLE CAUSES
• Wheel bearing malfunction
• Deformation of the wheel speed detection
encoder
• Adhesion of foreign materials on the wheel speed
detection encoder
• ABS-ECU malfunction
• The number of poles on the Magnetic encoder for
wheel speed detection (N-pole and S-pole) is
changed
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
35B-22
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C1041, C1042, C1043 or
C1044 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Check for wheel bearing looseness
NOTE: Loose wheel bearing may increase the gap
between the wheel speed sensor and the wheel
speed detection magnet encoder. Check the wheel
bearing for looseness. <Refer to GROUP 26 − Wheel
Bearing Axial Play Check . (front), GROUP 27A −
Wheel Bearing Axial Play Check (rear-2WD) or
GROUP 27B − Wheel Bearing Axial Play Check
(rear-4WD)>
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the wheel bearing <front> or rear
wheel hub assembly <rear>. <Refer to
GROUP 26 − Front Axle Hub Assembly
(front), GROUP 27A − Rear Axle Hub
Assembly (rear-2WD) or GROUP 27B −
Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 7.
STEP 4. Check of wheel speed detection encoder
<Front>
Oil seal
Wheel
bearing
Magnetic
encoder
AC504925 AD
<Rear>
<2WD>
Ball bearing
Rear hub
assembly
Magnetic
encoder
<4WD>
Rear wheel bearing
Magnetic
encoder
Rear hub
assembly
AC808708 AC
Check the encoder for adhesion of foreign materials
or deformation.
Q: Is the check result normal?
YES : Go to Step 5.
NO (Adhesion of foreign materials) : Remove the
foreign materials and clean the encoder so
as not to disturb the magnetisation pattern
on it while taking care of the magnet,
magnetic substance, and magnetic
attraction. Then go to Step 7.
NO (Deformation) : Replace the wheel bearing
<front> or rear wheel hub assembly <rear>.
<Refer to GROUP 26 − Front Axle Hub
Assembly (front), GROUP 27A − Rear Axle
Hub Assembly (rear-2WD) or GROUP 27B
− Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 7.
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 5. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1041, C1042, C1043 or
C1044 set?
YES : Replace the wheel speed sensor (Refer to
P.35B-63 <front> or P.35B-65 <rear>).
Then go to Step 6.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 6. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
35B-23
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1041, C1042, C1043 or
C1044 set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 7.
NO : This diagnosis is complete.
STEP 7. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1041, C1042, C1043 or
C1044 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1046 FL wheel speed sensor phase
Code No. C1047 FR wheel speed sensor phase
Code No. C1048 RL wheel speed sensor phase
Code No. C1049 RR wheel speed sensor phase
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C − CAN Bus Diagnostics Table ).
OPERATION
• The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which
north and south pole sides of the magnets are
arranged alternately) for detecting the wheel
speed which rotates at the same speed of the
wheels and wheel speed sensors. This sensor
outputs frequency pulse signals in proportion to
the wheel speed.
• The pulse signals, which the wheel speed sensor
creates, are sent to ABS-ECU. ABS-ECU uses
the frequency of the pulse signals to determine
the wheel speed.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if any malfunction below is
found:
• When the brake fluid pressure is decreased for a
long time.
• When the brake fluid pressure is held for a long
time.
PROBABLE CAUSES
•
•
•
•
•
•
•
•
•
•
•
•
Damaged wiring harness and connectors
External noise interference
Malfunction of wheel speed sensor
ABS-ECU malfunction
Excessive gap between the wheel speed sensor
and the magnetic encoder for wheel speed detection
Adhesion of foreign materials on the wheel speed
sensor
Adhesion of foreign materials on the magnetic
encoder for wheel speed detection
Wheel bearing malfunction
Improper installation of the wheel speed sensor
Deformation of the magnetic encoder for wheel
speed detection
Disturbance of magnetization pattern for magnetic encoder for wheel speed detection
Missing teeth of the magnetic encoder for wheel
speed detection
35B-24
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C1046, 1047, 1048 or 1049
set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. M.U.T.-III diagnosis code
Code No.C1046 is set
• Check that the diagnosis codes No.C100A,
C1011, C1014, and C1041 are also set.
Code No.C1047 is set
• Check that the diagnosis codes No.C1015,
C101C, C101F, and C1042 are also set.
Code No.C1048 is set
• Check that the diagnosis codes No.C1020,
C1027, C102A, and C1043 are also set.
Code No.C1049 is set
• Check that the diagnosis codes No.C102B,
C1032, C1035, and C1044 are also set.
Q: Are the diagnosis codes set?
YES : Carry out the diagnosis for the relevant
diagnosis codes.
NO : Go to Step 4.
STEP 5. Check the wiring harness between the
ABS-ECU connector terminal and the wheel
speed sensor connector terminal
Code No.C1046 is set
• Check of short to power supply, short to earth,
and open circuit in FL+, FL− line between
ABS-ECU connector and front wheel speed sensor (LH) connector.
Code No.C1047 is set
• Check of short to power supply, short to earth,
and open circuit in FR+, FR− line between
ABS-ECU connector and front wheel speed sensor (RH) connector.
Code No.C1048 is set
• Check of short to power supply, short to earth,
and open circuit in RL+, RL− line between
ABS-ECU connector and rear wheel speed sensor (LH) connector.
Code No.C1049 is set
• Check of short to power supply, short to earth,
and open circuit in RR+, RR− line between
ABS-ECU connector and rear wheel speed sensor (RH) connector.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair the connector(s) or wiring harness.
Then go to Step 12.
STEP 6. Check for wheel speed sensor
installation
Check how the wheel speed sensor is installed (Disconnection of wheel speed sensor, loose mounting
bolt, etc.).
Q: Is the check result normal?
YES : Go to Step 7.
NO : Reinstall the wheel speed sensor correctly
(Refer to P.35B-63 <front> or P.35B-65
<rear>). Then go to Step 7.
STEP 4. M.U.T.-III data list
Check the following data list (Refer to P.35B-54).
• Item No.01: FL wheel speed sensor
• Item No.02: FR wheel speed sensor
• Item No.03: RL wheel speed sensor
• Item No.04: RR wheel speed sensor
STEP 7. Check for wheel speed sensor output
current
Refer to P.35B-58.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Go to Step 5.
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the wheel speed sensor (Refer to
P.35B-63 <front> or P.35B-65 <rear>).
Then go to Step 11.
ANTI-SKID BRAKING SYSTEM (ABS)
35B-25
TROUBLESHOOTING
STEP 8. Check for wheel bearing looseness
NOTE: Loose wheel bearing may increase the gap
between the wheel speed sensor and the wheel
speed detection magnet encoder. Check the wheel
bearing for looseness. <Refer to GROUP 26 − Wheel
Bearing Axial Play Check . (front), GROUP 27A −
Wheel Bearing Axial Play Check (rear-2WD) or
GROUP 27B − Wheel Bearing Axial Play Check
(rear-4WD)>
Q: Is the check result normal?
YES : Go to Step 9.
NO : Replace the wheel bearing <front> or rear
wheel hub assembly <rear>. <Refer to
GROUP 26 − Front Axle Hub Assembly
(front), GROUP 27A − Rear Axle Hub
Assembly (rear-2WD) or GROUP 27B −
Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 12.
STEP 9. Check of wheel speed detection encoder
<Front>
Oil seal
Wheel
bearing
Magnetic
encoder
AC504925 AD
<Rear>
<2WD>
Ball bearing
Rear hub
assembly
Magnetic
encoder
<4WD>
Rear wheel bearing
Magnetic
encoder
Rear hub
assembly
AC808708 AC
Check the encoder for adhesion of foreign materials
or deformation.
Q: Is the check result normal?
YES : Go to Step 10.
NO (Adhesion of foreign materials) : Remove the
foreign materials and clean the encoder so
as not to disturb the magnetization pattern
on it while taking care of the magnet,
magnetic substance, and magnetic
attraction. Then go to Step 12.
NO (Deformation) : Replace the wheel bearing
<front> or rear wheel hub assembly <rear>.
<Refer to GROUP 26 − Front Axle Hub
Assembly (front), GROUP 27A − Rear Axle
Hub Assembly (rear-2WD) or GROUP 27B
− Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 12.
35B-26
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1046, 1047, 1048 or 1049
set?
YES : Replace the wheel speed sensor (Refer to
P.35B-63 <front> or P.35B-65 <rear>).
Then go to Step 11.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 11. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1046, 1047, 1048 or 1049
set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 12.
NO : This diagnosis is complete.
STEP 12. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1046, 1047, 1048 or 1049
set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C104B FL inlet valve
Code No. C104F FR inlet valve
Code No. C1053 RL inlet valve
Code No. C1057 RR inlet valve
Code No. C105F FL outlet valve
Code No. C1063 FR outlet valve
Code No. C1067 RL outlet valve
Code No. C105B RR outlet valve
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C − CAN Bus Diagnostics Table ).
OPERATION
• ABS-ECU contains the power supply circuit (+ BV
terminal) for the solenoid valve. The solenoid
valve is energised by the valve relay, which is
incorporated in ABS-ECU.
• The valve relay, which is incorporated in
ABS-ECU, is always energising the solenoid
valve unless the initial check is in progress when
the ignition switch is turned on, and the recurrent
system check is in progress.
• ABS-ECU activates the solenoid valve by turning
on its driving transistor.
DIAGNOSIS CODE SET CONDITIONS
These diagnosis codes will be set under the cases
below:
• The solenoid valve is not energized even after
ABS-ECU has turned on the driving transistor
(Open circuit is present in the power supply circuit to the ABS-ECU solenoid valve, or the valve
relay has failed).
• The solenoid valve is not energised even after
ABS-ECU has turned on the driving transistor
(Open circuit is present in the solenoid valve circuit in ABS-ECU, or the valve relay has failed).
• After ABS-ECU has turned off the driving transistor, the solenoid valve still remains energized
(short in the solenoid valve circuit).
• When a solenoid valve failure is detected
PROBABLE CAUSES
• ABS-ECU malfunction
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ).On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the relevant diagnosis code set?
YES : Go to Step 3.
NO : This diagnosis is complete.
35B-27
STEP 3. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is the relevant diagnosis code set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 4.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/ How to
Cope with Intermittent Malfunctions ).
STEP 4. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is the relevant diagnosis code set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C2104 Valve power supply circuit
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C − CAN Bus Diagnostics Table ).
OPERATION
• ABS-ECU contains the power supply circuit (+BV
terminal) for the solenoid valve. The solenoid
valve is energised by the valve relay, which is
incorporated in ABS-ECU.
• The valve relay, which is incorporated in
ABS-ECU, is always energising the solenoid
valve unless the initial check is in progress when
the ignition switch is turned on, and the recurrent
system check is in progress.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code will be set when the solenoid
valve supply voltage is not within the standard value.
PROBABLE CAUSES
Current trouble
• Fusible link malfunction
• Damaged wiring harness and connectors
• Abnormality in battery or alternator
• ABS-ECU malfunction
Past trouble
• Carry out diagnosis with particular emphasis on
wiring harness and connector failures between
the power supply circuit (+BV terminal) to
ABS-ECU solenoid valve or earth circuit (GND1,
GND2 terminal). For diagnosis procedures, refer
to How to treat past trouble (GROUP 00 − How to
Use Troubleshooting/How to Treat Past Trouble ).
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C2104 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Battery check
Refer to GROUP 54A − Battery Test .
YES : Go to Step 4.
Q: Is the battery in good condition?
NO : Replace the battery. Then go to Step 10.
35B-28
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 4. Charging system check
Refer to GROUP 16 − On−vehicle Service/Alternator
Output Line Voltage Drop Test .
Q: Is the charging system in good condition?
YES : Go to Step 5.
NO : Repair or replace the charging system
component(s). Then go to Step 10.
STEP 5. Fusible link check: Check the fusible link
No.4 and SBF7.
Visually check for open circuit in the fusible link No.4
and SBF7.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Resistance measurement at ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Disconnect the fusible link No.SBF7.
(3) Resistance between the +BV terminal and the
body earth.
OK: No continuity
Q: Is the check result normal?
YES : Replace the fusible link No.4 or SBF7. Then
go to Step 10.
NO : The short circuit may be present in the
power supply circuit. Repair the wiring
harness between the ABS-ECU connector
+BV terminal and the fusible link, and then
replace the fusible link No.4 or SBF7. Then
go to Step 10.
STEP 7. Voltage measurement at the ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between the +BV terminal
and the body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 8.
NO : The open circuit may be present in the
power supply circuit. Repair the wiring
harness between the ABS-ECU connector
+BV terminal and the fusible link. Then go to
Step 10.
STEP 8. Resistance measurement at ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between the GND1 terminal and the
body earth, and between the GND2 terminal and
the body earth
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 9.
NO : An open circuit may be present in the earth
circuit. Repair the wiring harness between
the ABS-ECU connector GND1 terminal and
the body earth, and between the ASC-ECU
connector GND2 terminal and the body
earth. Then go to Step 10.
STEP 9. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is the diagnosis code No.C2104 set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 10.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/ How to
Cope with Intermittent Malfunctions ).
STEP 10. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is the diagnosis code No.C2104 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
35B-29
Code No. C1073 Motor drive circuit
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C − CAN Bus Diagnostics Table ).
OPERATION
• ABS-ECU contains the power supply circuit (+BM
terminal) for the pump motor. The pump motor is
energised by the motor switch, which is incorporated in ABS-ECU.
• The pump motor switch, which is incorporated in
ABS-ECU, is always off unless the ABS operating
and the motor solenoid valve check is activated
when the vehicle is started.
• ABS-ECU activates the pump motor by turning
on the ECU built-in pump motor switch.
DIAGNOSIS CODE SET CONDITIONS
If the pump motor switch voltage drop indicates high
value when the pump motor operates or after the
operation, the pump motor operation is stopped and
this diagnosis code is set.
PROBABLE CAUSES
Current trouble
• Fusible link malfunction
• Damaged wiring harness and connectors
• Abnormality in battery or alternator
• ABS-ECU malfunction
STEP 2. Check whether the diagnosis code is
reset.
Q: Is the diagnosis code No.C1073 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Battery check
Refer to GROUP 54A − Battery Test .
Q: Is the battery in good condition?
YES : Go to Step 4.
NO : Replace the battery. Then go to Step 10.
STEP 4. Charging system check
Refer to GROUP 16 − On−vehicle Service/Alternator
Output Line Voltage Drop Test .
Q: Is the charging system in good condition?
YES : Go to Step 5.
NO : Repair or replace the charging system
component(s). Then go to Step 10.
STEP 5. Fusible link check: Check the fusible link
No.4 and SBF5.
Visually check for open circuit in the fusible link No.4
and SBF5.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
Past trouble
• Carry out diagnosis with particular emphasis on
wiring harness and connector failures between
the power supply circuit (+BM terminal) to the
ABS-ECU motor and the earth circuit (GND1,
GND2 terminal). For diagnosis procedures, refer
to How to treat past trouble (GROUP 00 − How to
Use Troubleshooting/How to Treat Past Trouble ).
STEP 6. Resistance measurement at ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between the +BM terminal and the
body earth.
OK: No continuity
DIAGNOSTIC PROCEDURE
Q: Is the check result normal?
YES : Replace the fusible link No.4 or SBF5. Then
go to Step 10.
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
NO : The short circuit may be present in the
power supply circuit. Repair the wiring
harness between the ABS-ECU connector
+BM terminal and the fusible link, and then
replace the fusible link No.4 or SBF5. Then
go to Step 10.
35B-30
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 7. Voltage measurement at the ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between the +BM terminal
and the body earth.
OK: Approximately system voltage
STEP 9. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or more.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the check result normal?
YES : Go to Step 8.
NO : The open circuit may be present in the
Q: Is the diagnosis code No.C1073 set?
YES : Replace the hydraulic unit (integrated with
power supply circuit. Repair the wiring
harness between the ABS-ECU connector
+BM terminal and the fusible link. Then go
to Step 10.
STEP 8. Resistance measurement at ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between the GND1 terminal and the
body earth, and between the GND2 terminal and
the body earth
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 9.
NO : An open circuit may be present in the earth
ABS-ECU) (Refer to P.35B-61). Then go to
Step 10.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or more.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1073 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
circuit. Repair the wiring harness between
the ABS-ECU connector GND1 terminal and
the body earth, and between the ABS-ECU
connector GND2 terminal and the body
earth. Then go to Step 10.
Code No. C2116 Pump motor voltage low
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
OPERATION
• ABS-ECU contains the power supply circuit (+BM
terminal) for the pump motor. The pump motor is
energised by the motor switch, which is incorporated in ABS-ECU.
• The pump motor switch, which is incorporated in
ABS-ECU, is always off unless the motor solenoid valve check is activated when the vehicle is
started.
• ABS-ECU activates the pump motor by turning
on the ECU built-in pump motor switch.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis codes will be set under the cases
below:
• When the power supply voltage of the pump
motor, which is not in operation, is abnormally low
for a prolonged period
• When the power supply voltage of the pump
motor, which is not in operation, is abnormally
high for a prolonged period
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
PROBABLE CAUSES
Current trouble
• Fusible link malfunction
• Damaged wiring harness and connectors
• Abnormality in battery or alternator
• ABS-ECU malfunction
Past trouble
• Carry out diagnosis with particular emphasis on
wiring harness and connector failures between
the power supply circuit (+BM terminal) to the
ABS-ECU motor and the earth circuit (GND1,
GND2 terminal). For diagnosis procedures, refer
to How to treat past trouble (GROUP 00 − How to
Use Troubleshooting/How to Treat Past Trouble ).
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C2116 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Battery check
Refer to GROUP 54A − Battery Test .
Q: Is the battery in good condition?
YES : Go to Step 4.
NO : Replace the battery. Then go to Step 10.
STEP 4. Charging system check
Refer to GROUP 16 − On−vehicle Service/Alternator
Output Line Voltage Drop Test .
Q: Is the charging system in good condition?
YES : Go to Step 5.
NO : Repair or replace the charging system
component(s). Then go to Step 10.
35B-31
STEP 5. Fusible link check: Check the fusible link
No.4 and SFB5.
Visually check for open circuit in the fusible link No.4
and SFB5.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Resistance measurement at ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Disconnect the fusible link No.4 or SFB5.
(3) Resistance between the +BM terminal and the
body earth.
OK: No continuity
Q: Is the check result normal?
YES : Replace the fusible link No.4 or SFB5. Then
go to Step 10.
NO : The short circuit may be present in the
power supply circuit. Repair the wiring
harness between the ABS-ECU connector
+BM terminal and the fusible link, and then
replace the fusible link No.4 or SFB5. Then
go to Step 10.
STEP 7. Voltage measurement at the ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between the +BM terminal
and the body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 8.
NO : The open circuit may be present in the
power supply circuit. Repair the wiring
harness between the ABS-ECU connector
+BM terminal and the fusible link. Then go
to Step 10.
STEP 8. Resistance measurement at ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between the GND1 terminal and the
body earth, and between the GND2 terminal and
the body earth.
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
35B-32
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
YES : Go to Step 9.
NO : An open circuit may be present in the earth
circuit. Repair the wiring harness between
the ABS-ECU connector GND1 terminal and
the body earth, and between the ABS-ECU
connector GND2 terminal and the body
earth. Then go to Step 10.
STEP 9. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C2116 set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 10.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/ How to
Cope with Intermittent Malfunctions ).
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C2116 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1000 Brake SW (stuck)
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
OPERATION
ETACS-ECU sends the ON signal generated when
the brake pedal is depressed and OFF signal generated when it is released to ABS-ECU via the CAN
bus lines.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set in the following case.
• When the vehicle has run for a long time with the
stop lamp switch turned ON.
• When the OFF status of the stop lamp switch
does not match the vehicle attitude
PROBABLE CAUSES
• Damaged wiring harness and connectors
• Improper adjustment of stop lamp switch installation position
• Malfunction of the stop lamp switch
• Malfunction of ETACS-ECU
• ABS-ECU malfunction
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No.C1000 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. M.U.T.-III other system's data list
Check the ETACS-ECU system data list.
• The brake pedal is depressed.
Item No.
Item name
Normal
condition
290
Stop lamp
switch
OFF to ON
Q: Is the check result normal?
YES : Go to Step 4.
NO : Refer to GROUP 54A − ETACS, Inspection
Procedure 12 "The stop lamp switch signal
is not received."
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 4. Diagnosis code recheck
Erase the diagnosis code.
STEP 5. Diagnosis code recheck
Erase the diagnosis code.
Q: Is diagnosis code No.C1000 set?
YES : Replace the hydraulic unit (integrated with
Q: Is diagnosis code No.C1000 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
ABS-ECU) (Refer to P.35B-61). Then go to
Step 5.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
35B-33
Code No. C2200 ECU internal error
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
OPERATION
ABS-ECU controls ABS by calculating the data sent
from the wheel speed sensor and the G sensor.
PROBABLE CAUSES
ABS-ECU malfunction
DIAGNOSTIC PROCEDURE
Check whether the diagnosis code is reset.
Erase the diagnosis code.
Q: Is the diagnosis code No. C2200 set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61).
NO : This diagnosis is complete.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when ABS-ECU has malfunction.
Code No. C2101 Power supply high voltage
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C − CAN Bus Diagnostics Table ).
OPERATION
The ABS-ECU is energized by the valve power supply circuit (+BV terminal). When the power is supplied from the ignition switch (IG1) to the IG1 relay in
ETACS-ECU, IG1 relay is turned on. At this time, the
valve power supply circuit (IG1 terminal) energizes
the ABS-ECU.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the ABS-ECU power
supply voltage is more than 18.0 ± 1.0 V.
PROBABLE CAUSES
• Battery failure
• ABS-ECU malfunction
• Charging system failed
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No.C2101 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
35B-34
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 3. Battery check
Refer to GROUP 54A − Battery Test .
Q: Is the battery in good condition?
YES : Go to Step 5.
NO : Charge or replace the battery. Then go to
Step 4.
STEP 4. Charging system check
Refer to GROUP 16 − On−vehicle Service/Alternator
Output Line Voltage Drop Test .
Q: Is the charging system in good condition?
YES : Go to Step 5.
NO : Repair or replace the charging system
component(s).
STEP 5. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C2101 set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 6.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 6. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C2101 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1395 Incomplete Brake fluid filling
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C − CAN Bus Diagnostics Table ).
DIAGNOSTIC PROCEDURE
DIAGNOSIS CODE SET CONDITIONS
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
This diagnosis code is set when the brake fluid is not
filled in the hydraulic unit.
PROBABLE CAUSES
• Different hydraulic unit (For delivery to factory)
• ABS-ECU malfunction
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is the diagnosis code No. C1395 set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61).
NO : This diagnosis is complete.
Code No. C1210 Longitudinal G SNS.input circuit
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C − CAN Bus Diagnostics Table ).
OPERATION
• ABS-ECU monitors if the output of G sensor is
normal or not.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if any malfunction below is
found:
• When the output value of the G sensor is abnormal
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
PROBABLE CAUSES
• ABS-ECU malfunction
• External noise interference
35B-35
YES : Go to Step 4.
NO : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 5.
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C1210 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 4. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is the diagnosis code No.C1210 set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 5.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 5. Check whether the diagnosis code is
reset.
Q: Is the diagnosis code No.C1210 set?
YES : Go to Step 1.
NO : The procedure is complete.
STEP 3. M.U.T.-III data list
Check the following data list (Refer to P.35B-54).
• Item 09: G sensor
Q: Is the check result normal?
Code No. C1242 Longitudinal G sensor signal
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C − CAN Bus Diagnostics Table ).
DIAGNOSTIC PROCEDURE
OPERATION
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
• ABS-ECU monitors if the output of G sensor is
normal or not.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality is
detected by comparing the G sensor value output
from the G sensor with the value output from the
wheel speed sensor.
PROBABLE CAUSES
•
•
•
•
•
Improper installation of the G sensor
Malfunction of wheel speed sensor
ABS-ECU malfunction
External noise interference
When the vehicle is driven on a drum roller
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C1242 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Check the wheel speed sensor-related
diagnosis code.
Use the M.U.T.-III to check whether the wheel speed
sensor-related diagnosis code is set or not.
Q: Is any diagnosis code set?
35B-36
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
YES : Troubleshoot for the relevant diagnosis
code (Refer to P.35B-11).
NO : Go to Step 4.
STEP 4. M.U.T.-III data list
Check the following data list (Refer to P.35B-54).
• Item 09: G sensor
Q: Is the check result normal?
YES : Go to Step 5.
NO : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61), and then go
to Step 6.
STEP 5. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1242 set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 6.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 6. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1242 set?
YES : Go to Step 1.
NO : The procedure is complete.
Code No. C123A: Sensor calibration
Code No. C2002: Valve calibration not completed
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
OPERATION
ABS-ECU stores the calibrated value of the G sensor.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
DIAGNOSIS CODE SET CONDITIONS
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
This diagnosis code is set when the calibrated value
for G sensor stored in ABS-ECU is not within the predetermined range.
Q: Is diagnosis code No.C123A or C2002 set?
YES : Go to Step 3
NO : This diagnosis is complete.
PROBABLE CAUSES
• Power supply is shut down while the calibrated
value is being stored.
• ABS-ECU malfunction
STEP 4. Charging system check
Refer to GROUP 16 − On−vehicle Service/Alternator
Output Line Voltage Drop Test .
STEP 3. Battery check
Refer to GROUP 54A − Battery Test .
Q: Is the battery in good condition?
YES : Go to Step 5.
NO : Go to Step 4.
Q: Is the charging system in good condition?
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
YES : Replace the battery. Then go to Step 9.
NO : Repair or replace the charging system
component(s).
STEP 5. Voltage measurement at the ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between the +BV terminal
and the body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Check of short to power supply, short to
earth, and open circuit in +BV line between
fusible link and ABS-ECU connector
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the fusible link, connector(s) or
wiring harness.
STEP 7. Resistance measurement at ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between the GND1 terminal and the
body earth, and between the GND2 terminal and
35B-37
the body earth.
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 9.
NO : Go to Step 8.
STEP 8. Check of open circuit in GND1, GND2
line between ABS-ECU connector and body earth
Q: Is the check result normal?
YES : Go to Step 9.
NO : Repair the connector(s) or wiring harness.
STEP 9. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C123A or C2002 set?
NO : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61), and then go
to Step 10.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 10. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C123A or C2002 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1608 EEPROM fail
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• If the ABS-ECU connector is disconnected or
the battery terminal is disconnected when the
ignition switch is ON, this diagnosis code
may be set.
• Since the failure information stored in the
past is erased after this diagnosis is carried
out, reproduce the state of malfunction.
OPERATION
The ABS-ECU stores diagnosis codes and failure
information in the EEPROM*.
The ABS-ECU is energized by the solenoid valve
power supply circuit (+BV terminal).
NOTE: *:EEPROM (Electrical Erasable and Programmable ROM)
DIAGNOSIS CODE SET CONDITIONS
• This diagnosis code is set when the failure information stored in the EEPROM is not reliable. The
failure information stored in the past is not output,
and only this diagnosis code is set.
• This diagnosis code may occur when ABS-ECU
power supply shutdown or drop between
ABS-ECU is writing a data to the EEPROM.
PROBABLE CAUSES
• Disconnection of the ABS-ECU connector or the
battery terminal when the ignition switch is ON
• Loose battery terminal
35B-38
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
• Abnormality in battery
• Damaged wiring harness and connectors
• ABS-ECU malfunction
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C1608 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Battery check
Refer to GROUP 54A − Battery Test .
Q: Is the battery in good condition?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Charging system check
Refer to GROUP 16 − On−vehicle Service/Alternator
Output Line Voltage Drop Test .
Q: Is the charging system in good condition?
YES : Replace the battery. Then go to Step 9.
NO : Repair or replace the charging system
component(s).
STEP 5. Voltage measurement at the ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between the +BV terminal
and the body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Check of short to power supply, short to
earth, and open circuit in +BV line between
fusible link and ABS-ECU connector
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the fusible link, connector(s) or
wiring harness.
STEP 7. Resistance measurement at ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between the GND1 terminal and the
body earth, and between the GND2 terminal and
the body earth.
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 9.
NO : Go to Step 8.
STEP 8. Check of open circuit in GND1, GND2
line between ABS-ECU connector and body earth
Q: Is the check result normal?
YES : Go to Step 9.
NO : Repair the connector(s) or wiring harness.
STEP 9. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Turn the ignition switch to the "LOCK" (OFF)
position.
(3) Turn the ignition switch to the "ON" position.
Q: Is diagnosis code No. C1608 set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
step 10.
NO : Go to step 11.
STEP 10. Check whether the diagnosis code is
reset.
Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF in
some cases unless the vehicle runs at 20 km/h or
higher.
Q: Is diagnosis code No. C1608 set?
YES : Return to Step 1.
NO : Go to step 11.
STEP 11. Check the other diagnosis code.
Drive the vehicle at 20 km/h or more.
NOTE: The ABS warning lamp does not turn OFF in
some cases unless the vehicle runs at 20 km/h or
higher.
Q: Is any diagnosis code set?
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
35B-39
YES : Carry out the applicable troubleshooting for
the diagnosis code (Refer to P.35B-11).
NO : The procedure is complete.
Code No.C1707: Implausible coding data
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When diagnosis code No.C1707 is set in
ABS-ECU, the diagnosis code may also be set
in ETACS-ECU. When the diagnosis code is
set in ETACS-ECU, carry out the diagnosis of
the diagnosis code for ETACS-ECU first.
OPERATION
ABS-ECU receives the vehicle information stored in
the ETACS-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
When received unset coding data from the
ETACS-ECU, this diagnosis code is set.
PROBABLE CAUSES
• Malfunction of ETACS-ECU
• ETACS-ECUs have been interchanged between
two vehicles.
• ABS-ECU malfunction
• ABS-ECUs have been interchanged between two
vehicles.
• Malfunction of ETACS-ECU coding data
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check whether any coding-related
diagnosis code is set by ETACS-ECU.
Q: Is the diagnosis code set?
YES : Troubleshoot for the relevant diagnosis
code.
NO : Go to Step 4.
STEP 4. Check part number of ABS-ECU
Check the part number of ABS-ECU.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 8.
STEP 5. ETACS-ECU coding data check
Refer to GROUP 00 − Coding List .
Q: Is the check result normal?
YES : Go to Step 6.
NO : Replace the ETACS-ECU (Refer to GROUP
54A − ETACS-ECU ).
STEP 6. Check part number of ETACS-ECU
Check the part number of ETACS-ECU.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the ETACS-ECU (Refer to GROUP
54A − ETACS-ECU ).
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
STEP 7. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Turn the ignition switch to the "OFF" position.
(3) Turn the ignition switch to the "ON" position.
(4) Turn the ignition switch to the "OFF" position.
(5) Turn the ignition switch to the "ON" position.
(6) Check that the ABS warning lamp goes out.
Q: Is diagnosis code No.C1707 set?
Q: Is diagnosis code No.C1707 set?
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
35B-40
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 8.
NO : The trouble can be an intermittent
malfunction (Refer to GROUP 00 − How to
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
(2)
(3)
(4)
(5)
(6)
Turn the ignition switch to the "OFF" position.
Turn the ignition switch to the "ON" position.
Turn the ignition switch to the "OFF" position.
Turn the ignition switch to the "ON" position.
Check that the ABS warning lamp goes out.
Q: Is diagnosis code No.C1707 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
STEP 8. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
Code No. C2204 Sensor cluster internal error
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
NOTE: This diagnosis code may be set when G and
yaw rate sensor is put on the turntable turning at high
speed.
PROBABLE CAUSES
• ABS-ECU malfunction
DIAGNOSTIC PROCEDURE
OPERATION
The ABS-ECU communicates with its integrated G
sensor.
Check whether the diagnosis code is reset.
Erase the diagnosis code.
DIAGNOSIS CODE SET CONDITIONS
Q: Is the diagnosis code No. C2204 set?
YES : Replace the hydraulic unit (integrated with
This diagnosis code will be set when the ABS-ECU
detects an defective G sensor.
ABS-ECU) (Refer to P.35B-61).
NO : This diagnosis is complete.
Code No. U0114 4WD CAN timeout
Code No. U0141 ETACS CAN timeout
•
•
•
•
CAUTION
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
If diagnosis codes U0114 and U0141 are set in
ABS-ECU, always diagnose the CAN bus line.
If there is any fault in the CAN bus lines, an
incorrect diagnosis code may be set. In this
case, the set diagnosis code is not highly reliable.
Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
When the ETACS-ECU of vehicles without
KOS is replaced, the encrypted code of the
ignition key needs to be registered to the
ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in
GROUP 54A, Immobilizer System − How to
Register Key ID .)
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if ABS-ECU cannot
receive the signal sent from other ECU for a certain
period.
OPERATION
ABS-ECU communicates with the 4WD-ECU and
ETACS-ECU via the CAN bus lines.
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
PROBABLE CAUSES
Code No. U0114
• Wiring harness or connector failure of CAN bus
line
• 4WD-ECU malfunction
• ABS-ECU malfunction
Code No. U0141
• Wiring harness or connector failure of CAN bus
line
• ETACS-ECU malfunction
• ABS-ECU malfunction
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 4.
STEP 2. Check whether the diagnosis code is
reset.
Q: Is Code No. U0114 or U0141 set?
YES : Go to Step 3.
NO : The procedure is complete.
35B-41
STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check that other diagnosis code is
set in the ECU corresponding to the relevant diagnosis.
Q: Is other diagnosis code set?
YES : Troubleshoot for the relevant diagnosis
code.
NO : Go to Step 4.
STEP 4. M.U.T.-III diagnosis code
Use M.U.T.-III to check if the same diagnosis code
(time-out) is set in the other ECU.
Q: Is any diagnosis code set?
YES (Code No. U0114 is set) : Replace 4WD-ECU,
and then go to Step 5.
YES (Code No. U0141 is set) : Replace the
ETACS-ECU, and then go to Step 5.
NO (No diagnosis code is set.) : The procedure is
complete.
STEP 5. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is Code No. U0114 or U0141 set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61).
NO : The procedure is complete.
Code No. U1073 Bus-off
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• If diagnosis code U1073 is set in ABS-ECU,
always diagnose the CAN bus line. If there is
any fault in the CAN bus lines, an incorrect
diagnosis code may be set. In this case, the
set diagnosis code is not highly reliable.
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when ABS-ECU has
ceased the CAN communication (bus off).
COMMENTS ON TROUBLE SYMPTOM
Malfunction of wiring harness, connector (s), or
ABS-ECU may be present.
PROBABLE CAUSES
• Wiring harness or connector failure of CAN bus
line
• ABS-ECU malfunction
• Other ECU malfunction
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 3.
35B-42
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 2. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
STEP 3. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No. U1073 set?
YES : Replace the hydraulic unit (integrated with
Q: Is diagnosis code No. U1073 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
ABS-ECU) (Refer to P.35B-61), and then go
to Step 3.
NO : If the trouble symptom is resolved, an
intermittent malfunction such as poorly
engaged connector(s) or wiring harness is
suspected (Refer to GROUP 00 − How to
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
Code No. U1195 Coding not completed
Code No. U1197 Coding data unavailable
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the diagnosis code U1195 or U1197 is
set in ABS-ECU, the diagnosis code may also
be set in ETACS-ECU. When the diagnosis
code is set in ETACS-ECU, carry out the diagnosis of the diagnosis code for ETACS-ECU
first.
OPERATION
ABS-ECU receives the vehicle information stored in
the ETACS-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
ABS-ECU communicates with ETACS-ECU via CAN
bus lines.
This diagnosis code No.U1195 is set when the variant coding for ETACS-ECU has not been implemented.
This diagnosis code No.U1197 is set when there is
difference between the vehicle information from the
ETACS-ECU and the vehicle information stored in
the ABS-ECU.
PROBABLE CAUSES
Code No.C1195 is set
• Variant coding for ETACS-ECU has not been
implemented.
• ABS-ECU malfunction
Code No.C1197 is set
• Malfunction of ETACS-ECU
• ETACS-ECU have been interchanged between
two vehicles.
• ABS-ECU malfunction
• External noise interference
• ABS-ECU have been interchanged between two
vehicles.
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No. U1195 or U1197 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check whether the
ETACS-ECU-related diagnosis code is set or not.
Q: Is any diagnosis code set?
ANTI-SKID BRAKING SYSTEM (ABS)
35B-43
TROUBLESHOOTING
YES : Troubleshoot for the relevant diagnosis
code.
NO : Go to Step 4.
STEP 4. Check ETACS coding data
Refer to GROUP 00 − Coding List .
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 5.
(2)
(3)
(4)
(5)
(6)
Q: Is the diagnosis code No.U1195 or U1197 set?
YES : Replace the hydraulic unit (ABS-ECU)
(Refer to P.35B-61). Then go to Step 8.
NO : The trouble can be an intermittent
malfunction (Refer to GROUP 00 − How to
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
STEP 5. ETACS-ECU variant coding
Perform the variant coding to the ETACS-ECU.
Q: Dose variant coding succeed?
YES : Go to Step 7.
NO : Replace the ETACS-ECU (Refer to GROUP
54A − ETACS-ECU ), and then go to Step 7.
STEP 6. Check part number of ABS-ECU
Check the part number of ABS-ECU.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 8.
Turn the ignition switch to the "OFF" position.
Turn the ignition switch to the "ON" position.
Turn the ignition switch to the "OFF" position.
Turn the ignition switch to the "ON" position.
Check that the ABS warning lamp goes out.
STEP 8. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Turn the ignition switch to the "OFF" position.
(3) Turn the ignition switch to the "ON" position.
(4) Turn the ignition switch to the "OFF" position.
(5) Turn the ignition switch to the "ON" position.
(6) Check that the ABS warning lamp goes out.
Q: Is the diagnosis code No.U1195 or U1197 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
TROUBLE SYMPTOM CHART
M1352011401667
STEP 7. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
CAUTION
• ABS may operate in the following conditions without hard braking: Slippery road surface,
high-speed turn, and bumpy road surface. When asking the customers, confirm that they
have/have not encountered ABS operation in corresponding conditions.
• During ABS operation, the brake pedal is pulled forward gradually, and the noise occurs at the
same time. This is because the brake line pressure varies intermittently to prevent the wheel lock,
and not a system malfunction.
• During diagnosis, a diagnosis code associated with other system may be set when the ignition
switch is turned on with connector(s) disconnected. On completion, confirm all systems for diagnosis code(s). If diagnosis code(s) are set, erase them all.
Trouble symptom
Inspection
procedure
No.
Reference
page
M.U.T.-III cannot communicate only with ABS-ECU.
1
P.35B-44
Brake warning lamp stays ON with the parking brake lever released.
2
P.35B-44
ABS warning lamp does not illuminate when ignition switch is turned to the
ON position (Engine stopped).
3
P.35B-46
Brake warning lamp does not illuminate when the ignition switch is turned to
ON position (Engine stopped).
4
P.35B-47
ABS warning lamp stays ON after the engine is started.
5
P.35B-48
35B-44
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
Trouble symptom
Inspection
procedure
No.
Reference
page
Abnormality in brake operation
6
P.35B-49
ABS system inoperative
7
P.35B-50
ABS-ECU power supply circuit system
8
P.35B-51
ABS operate too frequently.
9
P.35B-53
The initial check sound of hydraulic unit is loud
10
P.35B-54
SYMPTOM PROCEDURES
Inspection Procedure 1: M.U.T.-III cannot communication only with ABS-ECU.
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• If the power is supplied with the earth circuit
of CAN communication device open circuited,
an electric potential abnormality may occur to
the CAN bus lines.
COMMENTS ON TROUBLE SYMPTOM
When M.U.T.-III cannot communicate with the ABS
system, the CAN bus line, ABS-ECU power supply
circuit system, or ABS-ECU may be faulty.
PROBABLE CAUSES
•
•
•
•
•
•
Damaged wiring harness and connectors
ABS-ECU malfunction
Wrong routing of M.U.T.-III harness
Abnormality in battery or alternator
Abnormality in power supply voltage to ABS-ECU
ECU malfunction of other system
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Check the power supply circuit, and repair if
necessary (Refer to P.35B-51).
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ).
Inspection Procedure 2: Brake warning lamp stays ON with the parking brake lever released.
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
OPERATION
• When the parking brake switch is turned ON, the
combination meter (BRK terminal) is earthed, and
then the brake warning lamp illuminates.
• When reduction of the brake fluid amount is
detected, the brake fluid level switch is turned
from ON to OFF. ETACS-ECU monitors the brake
fluid level switch, and instructs the combination
meter via the CAN bus line to illuminate the brake
warning lamp.
COMMENTS ON TROUBLE SYMPTOM
This may be caused by earth fault in the parking
brake switch circuit.
PROBABLE CAUSES
• The brake pad thickness is at the limit value or
less.
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
• The brake fluid amount is at the "LOWER" level
or lower.
• Poor adjustment of the parking brake lever
• Damaged wiring harness and connectors
• Parking brake switch malfunction
• Brake fluid level switch malfunction
• Combination meter malfunction
• ETACS-ECU malfunction
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ).
STEP 2. M.U.T.-III diagnosis code for other
systems.
Use M.U.T.-III to check that the diagnosis code is set
in the combination meter and ETACS-ECU.
Q: Is the diagnosis code set?
YES : Carry out the diagnosis for the diagnosis
code.
35B-45
YES : Go to Step 10.
NO : Go to Step 6.
STEP 6. Brake fluid level switch check
Refer to GROUP 35A − On-vehicle Service/Brake
Fluid Level Switch Check .
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the reservoir tank assembly (Refer
to GROUP 35A − Master Cylinder Assembly
and Brake Booster ). Then go to Step 14.
STEP 7. Resistance measurement at brake fluid
level switch connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the resistance between the brake fluid
level switch connector (earth terminal) and the
body earth.
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 9.
NO : Go to Step 8.
STEP 8. Check of open circuit in earth line
between brake fluid level switch connector and
the body earth
NO : Go to Step 3.
STEP 3. Brake fluid level check
Check that the brake fluid is filled up to the "MIN"
level or higher.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Brake pad check
Refer to GROUP 35A − On-vehicle Service/Brake
Pad Check .
Q: Is the check result normal?
YES : Fill the brake fluid up to the "MAX" level.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Repair the connector(s) or wiring harness.
STEP 9. Check of short to power supply, short to
earth, and open circuit in HL1+ line between
ETACS-ECU connector and brake fluid level
switch connector
Q: Is the check result normal?
YES : Replace the ETACS-ECU (Refer to GROUP
54A − ETACS-ECU ). Then go to Step 14.
NO : Repair the connector(s) or wiring harness.
Then go to Step 5.
NO : Replace the brake pad (Refer to GROUP
35A − On-vehicle Service/Brake Pad
Replacement ). Then go to Step 14.
STEP 5. M.U.T.-III data list for other system
Check the ETACS-ECU system data list.
Item No.
Item name Normal condition
279
Brake fluid
switch
ON
Q: Is the check result normal?
STEP 10. Parking brake lever stroke check
Refer to GROUP 36 − On-vehicle Service/Parking
Brake Lever Stroke Check and Adjustment .
Q: Is the check result normal?
YES : Go to Step 11.
NO : Adjust the parking brake lever stroke (Refer
to GROUP 36 − On-vehicle Service/Parking
Brake Lever Stroke Check and Adjustment
). Then go to Step 14.
35B-46
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 11. Parking brake switch check
Refer to GROUP 36 − On-vehicle Service/Parking
Brake Switch Check .
Q: Is the check result normal?
YES : Go to Step 12.
NO : Replace the parking brake switch (Refer to
GROUP 36 − Parking Brake Lever ). Then
go to Step 14.
STEP 12. Check of short to power supply, short
to earth, and open circuit in BRK line between
combination meter connector and parking brake
switch connector
Q: Is the check result normal?
YES : Go to Step 13.
NO : Repair the connector(s) or wiring harness.
STEP 13. Retest the system.
Q: Does the brake warning lamp turn ON and OFF
normally according to the parking brake lever
operation?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the combination meter assembly
(Refer to GROUP 54A − Combination Meter
). Then go to Step 14.
STEP 14. Retest the system.
Q: Does the brake warning lamp turn ON and OFF
normally according to the parking brake lever
operation?
YES : This diagnosis is complete.
NO : Return to Step 1.
Inspection Procedure 3: ABS warning lamp does not illuminate when ignition switch is turned to the
ON position (engine stopped).
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Before replacing the ECU, ensure that the
communication circuit is normal.
OPERATION
• ABS-ECU sends the illumination request signal of
the ABS warning lamp to the combination meter
through ETACS-ECU via CAN communication.
• ABS-ECU illuminates the ABS warning lamp via
ETACS-ECU for approximately 3 seconds for
valve check with the ignition switch turned to the
ON position.
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). Then
go to Step 9.
STEP 2. M.U.T.-III diagnosis code
Use M.U.T.-III to check the diagnosis code for the
ABS system.
Q: Is the diagnosis code set?
YES : Carry out the diagnosis for the diagnosis
code (Refer to P.35B-11).
COMMENTS ON TROUBLE SYMPTOM
This may be caused by faults in the CAN bus line,
ETACS-ECU, combination meter or ABS-ECU.
PROBABLE CAUSES
•
•
•
•
•
Damaged wiring harness and connectors
ETACS-ECU malfunction
Combination meter malfunction
ABS-ECU malfunction
Malfunction of coding data for ETACS-ECU
NO : Go to Step 3.
STEP 3. M.U.T.-III Special Function for other
system
Perform the following special function by the combination meter system, and check if the ABS warning
lamp illuminates (Refer to GROUP 54A − Combination Meter ).
• Item 6: Indicator (AUTO)
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the combination meter.
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
35B-47
STEP 4. ETACS-ECU coding data check
Use M.U.T.-III to check if coding data stored in
ETACS-ECU is normal (Refer to GROUP 00 − Precautions before Service/Coding List ).
STEP 7. M.U.T.-III diagnosis code for other
systems
Using M.U.T.-III, check that diagnosis code No.
U0121 is not set by the ETACS system.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 5.
Q: Is the diagnosis code set?
YES : Perform troubleshooting on ETACS-ECU
(Refer to GROUP 54A −
ETACS/Troubleshooting ). Then go to Step
9.
NO : Go to Step 8.
STEP 5. ETACS-ECU coding data check
Perform the variant coding to the ETACS-ECU.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Replace the ETACS-ECU (Refer to GROUP
54A − ETACS-ECU ), and then go to Step 9.
STEP 8. Retest the system.
Q: Does the ABS warning lamp turn ON and OFF
normally?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 9.
STEP 6. M.U.T.-III diagnosis code for other
systems
Using M.U.T.-III, check that diagnosis code
No.U0141 is not set by the combination meter system.
Q: Is the diagnosis code set?
YES : Diagnose the combination meter (Refer to
GROUP 54A − Combination
Meter/Troubleshooting ). Then go to Step 9.
NO : Go to Step 7.
STEP 9. Retest the system.
Q: Does the ABS warning lamp turn ON and OFF
normally?
YES : This diagnosis is complete.
NO : Return to Step 1.
Inspection Procedure 4: Brake warning lamp does not illuminate when the ignition switch is turned to
ON position (Engine stopped).
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Before replacing the ECU, ensure that the
communication circuit is normal.
OPERATION
• ABS-ECU sends the illumination request signal of
the break warning lamp to the combination meter
through ETACS-ECU via the CAN communication.
• ABS-ECU illuminates brake warning lamp via
ETACS-ECU for approximately 3 seconds for
bulb check with the ignition switch turned to the
ON position.
COMMENTS ON TROUBLE SYMPTOM
This may be caused by faults in the CAN bus line,
ETACS-ECU, combination meter or ABS-ECU.
PROBABLE CAUSES
•
•
•
•
Damaged wiring harness and connectors
Malfunction of ETACS-ECU
Malfunction of combination meter
Malfunction of ABS-ECU
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). Then
go to Step 7.
35B-48
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 2. M.U.T.-III diagnosis code
Use M.U.T.-III to check the diagnosis code for the
ABS system.
Q: Is the diagnosis code set?
YES : Carry out the diagnosis for the diagnosis
code (Refer to P.35B-11).
NO : Go to Step 3.
STEP 3. M.U.T.-III Special Function for other
system
Perform the following special function by the combination meter system, and check if the ABS warning
lamp illuminates (Refer to GROUP 54A − Combination Meter ).
• Item 6: Indicator (AUTO)
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the combination meter.
STEP 4. M.U.T.-III diagnosis code for other
systems
Using M.U.T.-III, check that diagnosis code
No.U0141 is not set by the combination meter system.
Q: Is the diagnosis code set?
YES : Diagnose the combination meter (Refer to
STEP 5. M.U.T.-III diagnosis code for other
systems
Using M.U.T.-III, check that diagnosis code No.
U0121 is not set by the ETACS system.
Q: Is the diagnosis code set?
YES : Perform troubleshooting on ETACS-ECU
(Refer to GROUP 54A −
ETACS/Troubleshooting ). Then go to Step
7.
NO : Go to Step 6.
STEP 6. Retest the system.
Q: Does the brake warning lamp turn ON and OFF
normally?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 7.
STEP 7. Retest the system.
Q: Does the brake warning lamp turn ON and OFF
normally?
YES : This diagnosis is complete.
NO : Return to Step 1.
GROUP 54A − Combination
Meter/Troubleshooting ). Then go to Step 7.
NO : Go to Step 5.
Inspection Procedure 5: ABS warning lamp stays ON after the engine is started.
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
OPERATION
• ABS-ECU sends the illumination request signal of
the ABS warning lamp to the combination meter
through ETACS-ECU via CAN communication.
• ABS-ECU illuminates the ABS warning lamp via
ETACS-ECU for approximately 3 seconds for
valve check with the ignition switch turned to the
ON position.
COMMENTS ON TROUBLE SYMPTOM
This may be caused by faults in the CAN bus line,
ETACS-ECU, combination meter or ABS-ECU.
PROBABLE CAUSES
• Damaged wiring harness and connectors
• Malfunction of ETACS-ECU
• Malfunction of combination meter
• Malfunction of ABS-ECU
NOTE: Due to the abnormality in the supply voltage,
the diagnosis code may not be set even when the
ABS warning lamp is illuminated.
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). Then
go to Step 7.
STEP 2. M.U.T.-III diagnosis code
Use M.U.T.-III to check the diagnosis code for the
ABS system.
Q: Is the diagnosis code set?
YES : Carry out the diagnosis for the diagnosis
code (Refer to P.35B-11).
NO : Go to Step 3.
STEP 3. Check the ABS-ECU power supply
circuit system.
Refer to P.35B-51.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Carry out the diagnosis of ABS-ECU power
supply circuit system (Refer to P.35B-51).
STEP 4. M.U.T.-III diagnosis code for other
systems
Using M.U.T.-III, check that diagnosis code
No.U0141 is not set by the combination meter system.
Q: Is the diagnosis code set?
35B-49
YES : Diagnose the combination meter (Refer to
GROUP 54A − Combination
Meter/Troubleshooting ). Then go to Step 7.
NO : Go to Step 5.
STEP 5. M.U.T.-III diagnosis code for other
systems
Using M.U.T.-III, check that diagnosis code
No.U0121 is not set by the ETACS system.
Q: Is the diagnosis code set?
YES : Perform troubleshooting on ETACS-ECU
(Refer to GROUP 54A −
ETACS/Troubleshooting ). Then go to Step
7.
NO : Go to Step 6.
STEP 6. Retest the system.
Drive the vehicle more at 10 km/h or high.
Q: Does the ABS warning lamp turn ON and OFF
normally?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 7.
STEP 7. Retest the system.
Drive the vehicle more at 10 km/h or high.
Q: Does the ABS warning lamp turn ON and OFF
normally?
YES : This diagnosis is complete.
NO : Return to Step 1.
Inspection Procedure 6: Abnormality in brake operation
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
COMMENTS ON TROUBLE SYMPTOM
Although the cause of the trouble cannot be clearly
resolved since it depends on the running status and
road surface condition, the malfunction of the
hydraulic circuit may occur if any diagnosis code is
not detected.
PROBABLE CAUSES
• Malfunction of hydraulic unit (integrated with
ABS-ECU)
• Malfunction of hydraulic circuit
• Malfunction of brake assembly
• Malfunction of brake booster
• Malfunction of master cylinder assembly
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
35B-50
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code check
Use M.U.T.-III to check the diagnosis code for the
ABS system (Refer to P.35B-11).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Carry out the diagnosis for the diagnosis
code chart (Refer to P.35B-11).
STEP 4. Brake operation check
Perform the following checks.
• Brake pedal check (Refer to GROUP 35A −
On-vehicle Service/Brake Pedal Check ).
• Brake booster check (Refer to GROUP 35A −
On-vehicle Service/Brake Booster Operation
Check ).
• Check valve check (Refer to GROUP 35A −
On-vehicle Service/Check Valve Operation
Check ).
Q: Can any fault be found with the brake operation?
YES : Check the brake-related parts, and repair if
necessary. Then, go to Step 5.
STEP 3. Hydraulic unit (integrated with
ABS-ECU) check
Check that the brake tube is correctly mounted to the
hydraulic unit (integrated with ABS-ECU) (Refer to
P.35B-61).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Connect the brake tubes correctly, and
repair or replace the external brake lines of
the hydraulic unit (integrated with
ABS-ECU).
NO : Go to Step 5.
STEP 5. Hydraulic unit check
Perform the following actuator tests (Refer to
P.35B-55).
• Item No.01: FL wheel ABS
• Item No.02: FR wheel ABS
• Item No.03: RL wheel ABS
• Item No.04: RR wheel ABS
Q: Is the check result normal?
YES : This diagnosis is complete.
NO : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61).
Inspection Procedure 7: ABS system inoperative
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
COMMENTS ON TROUBLE SYMPTOM
In case of this trouble symptom, ABS system operation may be disabled. Diagnosis code may be set by
the ABS system using M.U.T.-III.
PROBABLE CAUSES
• Low battery voltage
• Wiring harness or connector failure of CAN bus
line
• The ABS-ECU is defective.
• Different ETACS-ECU, abnormal variant coding
information
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code check
Use M.U.T.-III to check the diagnosis code for the
ABS system. (Refer to P.35B-11.)
Q: Is the check result normal?
YES : Go to Step 3.
NO : Carry out the diagnosis for the diagnosis
code chart (Refer to P.35B-11). Then go to
Step 7.
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 3. Check the ABS-ECU power supply
circuit.
Refer to P.35B-51.
35B-51
STEP 5. Operation check
Q: Does the ABS work normally?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Check the brake system related
components except ABS. Then go to Step 6.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Carry out the diagnosis of ABS-ECU power
supply circuit system (Refer to P.35B-51).
Then go to Step 7.
STEP 6. Operation check
STEP 4. Hydraulic unit (integrated with
ABS-ECU) check
Check that the brake tube is correctly mounted to the
hydraulic unit (integrated with ABS-ECU) (Refer to
P.35B-61).
Q: Is the check result normal?
YES : Go to Step 5.
NO : Connect the brake tube correctly. Then go
to Step 7.
Q: Does the ABS work normally?
YES : This diagnosis is complete.
NO : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 7.
STEP 7. Operation check
Q: Does the ABS warning lamp turn ON and OFF
normally?
YES : This diagnosis is complete.
NO : Return to Step 1.
Inspection Procedure 8: ABS-ECU power supply circuit system
CAUTION
• When the ABS-ECU power supply voltage
becomes 9.7 ± 0.3 V or less, the ABS warning
lamp illuminate, and the ABS control is prohibited.
• If the battery terminal is not tightened properly, a dump surge may occur and the power
supply voltage may become abnormally high
for a short time.
OPERATION
• ABS-ECU contains the power supply circuit (+BV
terminal) for the solenoid valve. The solenoid
valve is energised by the valve relay, which is
incorporated in ABS-ECU.
• ABS-ECU contains the power supply circuit (+BM
terminal) for the pump motor. The pump motor is
energised by the motor relay, which is incorporated in ABS-ECU.
• ABS-ECU contains the power supply circuit (IG1
terminal) for ABS-ECU. When the ignition switch
(IG1) is turned ON, the voltage is applied to the
relay incorporated in ETACS-ECU to turn ON the
relay, and the power is supplied from fusible link
through multi-purpose fuse.
• When malfunction occurs in ABS-ECU power
supply, the communication with M.U.T.-III
becomes unavailable.
PROBABLE CAUSES
•
•
•
•
•
•
•
Damaged wiring harness and connectors
Malfunction of fuse and fusible link
Improper tightening of battery terminal
Improper tightening of earth bolt
Battery failure
Charging system failed
Malfunction of ABS-ECU
DIAGNOSTIC PROCEDURE
STEP 1. Battery check
Refer to GROUP 54A − Battery Test .
Q: Is the battery in good condition?
YES : Go to Step 3.
NO : Charge or replace the battery. Then go to
Step 2.
STEP 2. Charging system check
Refer to GROUP 16 − On−vehicle Service/Alternator
Output Line Voltage Drop Test .
Q: Is the charging system in good condition?
YES : Go to Step 3.
NO : Repair or replace the charging system
component(s).
35B-52
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
STEP 3. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the ETACS-ECU.
Q: Is the diagnosis code set?
YES : Troubleshoot the ETACS. Refer to GROUP
54A - ETACS .
NO : Go to Step 4.
STEP 4. Voltage measurement at the ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between ABS-ECU (+BV
terminal) and body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Check of short to power supply, short to
earth, and open circuit in +BV line between
fusible link and ABS-ECU connector
Q: Is the check result normal?
YES : Intermittent malfunction is suspected (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunction ).
NO : Repair the fusible link, connector(s) or
wiring harness. Then go to Step 13.
STEP 6. Voltage measurement at the ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between ABS-ECU (+BM
terminal) and body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 8.
NO : Go to Step 7.
STEP 7. Check of short to power supply, short to
earth, and open circuit in +BM line between
fusible link and ABS-ECU connector
Q: Is the check result normal?
YES : Intermittent malfunction is suspected (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunction ).
NO : Repair the fusible link, connector(s) or
wiring harness. Then go to Step 13.
STEP 8. Voltage measurement at the ABS-ECU
connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between ABS-ECU (IG1
terminal) and body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 10.
NO : Go to Step 9.
STEP 9. Check of short to power supply, short to
earth, and open circuit in IG1 line between
ETACS-ECU and ABS-ECU connector
Q: Is the check result normal?
YES : Intermittent malfunction is suspected (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunction ).
NO : Repair the connector(s) or wiring harness.
Then go to Step 13.
STEP 10. Resistance measurement at ABS-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between the ABS-ECU (GND1
terminal) and the body earth, and between the
ABS-ECU (GND2 terminal) and the body earth
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 12.
NO : Go to Step 11.
STEP 11. Check of open circuit in GND1, GND2
line between ABS-ECU connector and body earth
Q: Is the check result normal?
YES : Intermittent malfunction is suspected (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunction ).
NO : Repair the connector(s) or wiring harness.
Then go to Step 13.
STEP 12. Retest the system.
Q: Is the communication with M.U.T.-III possible?
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 13.
35B-53
STEP 13. Retest the system.
Q: Is the communication with M.U.T.-III possible?
YES : Return to Step 1.
NO : This diagnosis is complete.
INSPECTION PROCEDURE 9: ABS operates too frequently.
CAUTION
Whenever ECU is replaced, ensure that the CAN
bus lines are normal.
COMMENTS ON TROUBLE SYMPTOM
• Although the cause of the trouble cannot be
clearly resolved since it depends on the running
status and road surface condition, the malfunction of the hydraulic circuit may occur if any diagnosis code is not detected.
• If wheels and tyres other than the ones with genuine specified size are mounted, the ABS may be
activated prematurely.
• If a non-genuine braking device or non-genuine
impact reduction device is mounted, the ABS
may be activated prematurely.
PROBABLE CAUSES
• Mounting of wheels and tyres other than with
genuine specified size
• Tyre pressure abnormality
• Tyre wear and deterioration
• Mounting of non-genuine braking device or
impact reduction device
• Wheel alignment abnormality
• Malfunction of brake related parts
• ABS-ECU malfunction
• Malfunction of hydraulic circuit
• External radio wave noise interference
DIAGNOSIS PROCEDURE
STEP 1. Check the wheels and the tyres.
Carry out the following check.
• Size check of wheels and tyres
• Tyre wear and deterioration statuses
• Check the tyre pressure.
NOTE: For the tyre pressure, refer to the tyre pressure label attached to the lower section of driver's
side door striker.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Correct the wheels and tyres in good
condition. Then go to Step 9.
STEP 2. Diagnosis code check
Use M.U.T.-III to check the diagnosis code for the
ABS system. (Refer to P.35B-11.)
Q: Is the check result normal?
YES : Go to Step 3.
NO : Carry out the diagnosis for the diagnosis
code. (Refer to P.35B-11.) Then go to Step
9.
STEP 3. Check of brake system related
components other than hydraulic unit (integrated
with ABS-ECU)
At the same time with the following checks, also
check that no parts other than the genuine parts are
mounted.
• Brake pad check (Refer to GROUP 35A −
On-vehicle Service/Brake Pad Check ).
• Brake disc runout check (Refer to GROUP 35A −
On-vehicle Service/Brake Disk Check ).
• Brake drag force check (Refer to GROUP 35A −
Front Disc Brake Assembly or GROUP 35A −
Rear Disc Brake Assembly ).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the part(s) having damage
or other problems. Then go to Step 9.
STEP 4. Wheel alignment check
At the same time with the following checks, also
check that no parts other than the genuine parts are
mounted.
• Front wheel alignment check (Refer to GROUP
33 − On-vehicle Service/Front Wheel Alignment
Check and Adjustment .)
• Rear wheel alignment check (Refer to GROUP
34 − On-vehicle Service/Rear Wheel Alignment
Check and Adjustment .)
Q: Is the check result normal?
35B-54
ANTI-SKID BRAKING SYSTEM (ABS)
TROUBLESHOOTING
YES : Go to Step 5.
NO : Repair or replace the part(s) having damage
or other problems. Then go to Step 9.
STEP 5. M.U.T.-III data list
Check the following data list. (Refer to P.35B-54.)
• Item No.01: FL wheel speed sensor
• Item No.02: FR wheel speed sensor
• Item No.03: RL wheel speed sensor
• Item No.04: RR wheel speed sensor
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 7. Hydraulic unit check
Carry out the following actuator tests, and check if
they work normally (Refer to P.35B-55).
• Item No.01: FL wheel ABS
• Item No.02: FR wheel ABS
• Item No.03: RL wheel ABS
• Item No.04: RR wheel ABS
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 9.
STEP 8. ABS operation check
STEP 6. Wheel speed sensor check
Check that no non-genuine electronic device or no
wiring harness of other than genuine electronic
device is mounted near the wheel speed sensor (at
wheel speed detection section and wiring harness
section) (Refer to P.35B-63<Front> or
P.35B-65<Rear>).
Q: Is the check result normal?
YES : Go to Step 7.
NO : Remove the non-genuine electronic device
or the wiring harness of non-genuine
electronic device. Then go to Step 9.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the hydraulic unit (integrated with
ABS-ECU) (Refer to P.35B-61). Then go to
Step 9.
STEP 9. ABS operation check
Q: Is the check result normal?
YES : This diagnosis is complete.
NO : Return to Step 1.
Inspection Procedure 10: The initial check sound of hydraulic unit is loud.
CAUTION
When installing brake tube, match the axial
centre of flare nut and brake tube with the centre
of hole at the hydraulic unit side, and check that
the fluid does not leak.
COMMENT ON TROUBLE SYMPTOM
The operation sound may be decreased by reducing
the load at the rubber mount portion of the brake
tube and hydraulic unit.
PROBABLE CAUSES
• Improper installation of the hydraulic unit
• Improper installation of the brake tube
DIAGNOSIS PROCEDURE
DRIVING CHECK
(1) Turn the ignition switch from the "LOCK" (OFF)
position to the "ON" position.
(2) When vehicle speed reaches 10 km/h, check the
operating sound volume and compare it with that
of the same model.
OK: The operating sound is the same volume or less by comparing with that of the
same model.
Q: Is the check result normal?
YES : This diagnosis is complete.
NO : Carry out adjustment for hydraulic unit
installation. (Refer to P.35B-59).
DATA LIST REFERENCE TABLE
M1352011501471
The following items can be read by the M.U.T.-III
from the ABS-ECU input data.
The following items of ECU input data can be read
using M.U.T.-III.
ANTI-SKID BRAKING SYSTEM (ABS)
35B-55
TROUBLESHOOTING
Item No.
Check item
Check condition
01
FL wheel speed sensor
02
FR wheel speed sensor
03
RL wheel speed sensor
Perform a test run of the vehicle. The speedometer display and
the M.U.T.-III display almost
agree with each other. (During
stop: approximately 0.7km/h)
04
RR wheel speed sensor
05
Power supply voltage
07
Brake switch (input)
09
14
15
86
G sensor
Brake switch
Emission test mode
Ignition switch
Normal condition
System voltage (10 to 18 V
ABS operable range)
The brake pedal is released.
OFF
The brake pedal is depressed.
ON
Vehicle stopped (level)
-0.11 to 0.11 G
Running
-1 to 1 G
The brake pedal is depressed.
ON
The brake pedal is released.
OFF
When the emission mode is not
executed
OFF
When the emission mode is
executed
ON
When the ABS system is not
activated
OFF
When the ABS system is
activated
ON
ON
87
Ignition switch (input)
Ignition switch is "ON" position
88
Vehicle speed
Perform a test run of the vehicle. The speedometer display and
the M.U.T.-III display almost
agree with each other.
91
Brake pressure sensor
Not used.
96
G sensor offset
Difference between the positions -0.2 to 0.2 G
of the ABS-ECU when the
vehicle is stationary and while
the vehicle is being driven
105
Power supply voltage (input)
System voltage (10 to 18 V
ABS operable range)
138
ESS request
Not used.
• System shutdown by ECU
While ABS-ECU is disabled by the diagnostic
function, the M.U.T.-III displayed data is different
from the actual measurement.
ACTUATOR TEST REFERENCE TABLE
M1352011601274
Using M.U.T.-III, the following actuators can be forcibly operated:
ANTI-SKID BRAKING SYSTEM (ABS)
35B-56
TROUBLESHOOTING
NOTE: .
• ABS is operated by ABS-ECU.
• When ABS-ECU is disabled due to the fail-safe
function, the actuator test cannot be performed.
• The actuator test can be performed only when
the vehicle is stationary.
• While the actuator test is performed, the ABS
warning lamp flashes at a rate of 2 Hz.
• After the actuator test has been performed, the
brake warning lamp and ABS warning lamp illuminate until the ignition switch is turned to ON
again or the communication between M.U.T.-III
and ABS-ECU is terminated.
Actuator test specifications
Item No.
Check item
Driven component
01
FL wheel ABS drive
02
FR wheel ABS drive
03
RL wheel ABS drive
Solenoid valve for the corresponding
wheel of the hydraulic unit and pump
motor (simplified inspection mode)
04
RR wheel ABS drive
10
ESS test mode
Not used.
Operation pattern of items 01 to 04
M.U.T.-III actuator test
(Item No.01, 02, 03, 04) start
End
Increase in pressure
Solenoid valve
Steady pressure
Reduction in pressure
Drive
Pump motor
Stop
Approx. 0.05
seconds
1seconds
2 seconds
Approx. 0.01
seconds
AC606811
CHECK AT ECU TERMINALS
M1352011801494
TERMINAL VOLTAGE CHECK
Lock lever
ACB04918AB
ANTI-SKID BRAKING SYSTEM (ABS)
35B-57
TROUBLESHOOTING
1. Operate the lock lever to disconnect the
ABS-ECU harness connector as shown in the
figure.
3. The terminal layout is shown in the illustration.
NOTE: Do not measure terminal voltage for approximately three seconds after the ignition switch is
turned to the "ON" position. The ABS-ECU performs
the initial check during that period.
2. Disconnect the ABS-ECU connector, and
measure the voltages between earth terminal
No.13 or No.38 and each respective terminal.
ACB05853
Termin Terminal Check item
al No.
code
Checking requirements
Normal condition
1
+BM
Motor power supply
Always
Battery voltage
2−5
−
−
−
−
6
IG1
ABS-ECU power supply(IG1)
Ignition switch: "ON"
Battery voltage
Ignition switch: "OFF"
1 V or less
7−9
−
−
−
−
10
CANL
CAN bus line
−
−
11
CANH
CAN bus line
−
−
12
−
−
−
−
13
GND1
Earth
Always
1 V or less
14−24
−
−
−
−
25
+BV
Solenoid valve power supply
Always
Battery voltage
26
FR-
Wheel speed sensor (FR)
signal
Drive vehicle
Approximately
system voltage
27
FR+
Wheel speed sensor (FR)
power supply
Ignition switch: "ON"
Approximately
system voltage
28
−
−
−
−
29
RL+
Wheel speed sensor (RL)
power supply
Ignition switch: "ON"
Approximately
system voltage
30
RL-
Wheel speed sensor (RL)
signal
Drive vehicle
Approximately
system voltage
31, 32
−
−
−
−
33
RR-
Wheel speed sensor (RR)
signal
Drive vehicle
Approximately
system voltage
34
RR+
Wheel speed sensor (RR)
power supply
Ignition switch: "ON"
Approximately
system voltage
35
−
−
−
−
36
FL+
Wheel speed sensor (FL)
power supply
Ignition switch: "ON"
Approximately
system voltage
ANTI-SKID BRAKING SYSTEM (ABS)
35B-58
ON-VEHICLE SERVICE
Termin Terminal Check item
al No.
code
Checking requirements
Normal condition
37
FL-
Wheel speed sensor (FL)
signal
Drive vehicle
Approximately
system voltage
38
GND2
Earth
Always
1 V or less
CONTINUITY CHECK AT WIRING
HARNESS-SIDE CONNECTOR
1. Operate the lock lever to disconnect the
ABS-ECU harness connector as shown in the
figure.
2. Check the resistance and continuity between the
terminals indicated in the table below.
3. The terminal layout is shown in the illustration.
Lock lever
ACB04918AB
ACB05853
Terminal No.
Signal
Normal condition
13 − body earth
Earth
Continuity exists (2 Ω or
less)
38 − body earth
Earth
Continuity exists (2 Ω or
less)
ON-VEHICLE SERVICE
WHEEL SPEED SENSOR OUTPUT
CURRENT MEASUREMENT
M1352032800043
The relevant wheel, on which the wheel speed sensor is fitted, should be free to run.
1. Remove the wheel speed sensor connector to be
checked.
ANTI-SKID BRAKING SYSTEM (ABS)
ON-VEHICLE SERVICE
CAUTION
For precise measurement, do not connect to the
wheel speed sensor-side connector and the wiring harness side connector terminal No.1.
Harness
connector
Wheel speed
sensor
connector
35B-59
Standard value: 5.9 to 8.4 mA or 11.8 to 16.8
mA
5. If the measurement is not within the standard
value, or the output current does not change in
proportion to the wheel rotation, replace the wheel
speed sensor (Refer to P.35B-63 <Front>,
P.35B-65 <Rear>).
HYDRAULIC UNIT CHECK
M1352001701184
1. Raise the vehicle using a jack and support the
specified points with a rigid rack.
CAUTION
Before connecting or disconnecting M.U.T.-III,
always turn the ignition switch to the LOCK
(OFF) position.
MB991709
AC905456 AB
2. Use the special tool test harness (MB991709) to
connect a multimeter between the wheel speed
sensor-side connector and the wiring harness
connector terminal No.2.
3. Turn the ignition switch to the "ON" position.
CAUTION
Do not rotate the wheel too quickly. Output current changes significantly as the wheel speed
detection magnetic encoder comes near or goes
away from the wheel speed sensor.
4. Rotate the wheel, on which the wheel speed
sensor is fitted, quite slowly to measure the output
current with the multimeter.
2. Before setting M.U.T.-III, turn the ignition key to
the LOCK (OFF) position.
3. Confirm that the selector lever is in the "N"
position, and then start the engine.
4. When carrying out the actuator tests No. 01 to 04,
perform the actuator tests using M.U.T.-III while
depressing the brake pedal. When carrying out
the actuator tests, rotate the wheel by hands to
confirm that the braking force changes.
NOTE: .
• While performing the actuator test, the ABS
warning lamp flashes at a rate of 2 Hz.
• When ABS-ECU is disabled due to the
fail-safe function, the M.U.T.-III actuator test
cannot be performed.
• After the actuator test has been performed,
the ABS warning lamp and brake waning lamp
illuminate until the ignition switch is turned to
ON again or the communication between
M.U.T.-III and ABS-ECU is terminated.
ANTI-SKID BRAKING SYSTEM (ABS)
35B-60
ON-VEHICLE SERVICE
Depressed
Pedal
operation
M.U.T.-III actuator test
(Item No.01, 02, 03, 04) start
Released
Increase in pressure
Solenoid
valve
position
Approximately
2 seconds
Steady pressure
Approximately
1 second
Reduction in pressure
Checking
the brake
force
Lock
Approximately
3 seconds
The pedal is free
Approximately
0.05 second
AC000954AM
5. This is indicated as shown in the above.
6. When any malfunction has been found, take a
necessary action according to the "Judgement
Table."
Judgement Table
Display on
M.U.T.-III
Operation
Inspection
result
01 FL wheel
speed sensor
02 FR wheel
speed sensor
03 RL wheel
speed sensor
04 RR wheel
speed sensor
• Depress the brake
pedal to lock the
vehicle.
• Select the vehicle
to be inspected
using M.U.T.-III,
perform the
actuator test.
• Rotate the selected
wheel by hands to
confirm the braking
force.
Braking force
Normal
decreases for 3
seconds from
the lock status.
−
−
The wheel
does not lock
even if the
brake pedal is
depressed.
Clogged brake line
other than hydraulic
unit
Check and
clean the brake
line.
Clogged hydraulic
circuit in the hydraulic
unit
Replace the
hydraulic unit
assembly.
Faulty routing of
hydraulic unit brake
tube
Route the
brake tube
correctly.
Braking force
does not
decrease.
Judgem Probable cause
ent
Error
Remedy
Malfunction of
Replace the
hydraulic unit solenoid hydraulic unit
valve operation
assembly.
7. After the inspection, turn the ignition switch to the
LOCK (OFF) position, and then disconnect
M.U.T.-III.
Hydraulic unit installation adjustment
Operate the pre-removal steps for the hydraulic unit.
(Refer to P.35B-61.)
1. Remove all brake tubes.
2. Loosen the mounting bolt and nut of the hydraulic
unit bracket.
3. Install all brake tubes temporarily.
4. Shake hydraulic unit to all directions with both
hands to make the hydraulic unit bracket insulator
fit with the unit.
5. Install the hydraulic unit bracket with mounting
bolt and nut not to load the brake tube.
6. Install all brake tubes securely.
NOTE: Install the flare nut taking care not to let
the brake tube turn together.
7. Operate the post-installation steps of the hydraulic
unit. (Refer to P.35B-61.)
ANTI-SKID BRAKING SYSTEM (ABS)
35B-61
HYDRAULIC UNIT
IN THE EVENT OF A DISCHARGED
BATTERY
M1352003500785
WARNING
If the ABS is not operating, the vehicle posture will be unstable during braking, Do not
drive the vehicle with the ABS-ECU connector disconnected or with the ABS not operating for any other reason.
If the engine is started using a booster cable when
the battery is completely flat, and the vehicle is then
driven without waiting for the battery to be recharged,
the engine may misfire and it may not be possible to
drive the vehicle. This is because the ABS consumes
a large amount of current when carrying out its initial
checks. If this happens, recharge the battery fully.
HYDRAULIC UNIT
REMOVAL AND INSTALLATION
M1352008601241
NOTE: ABS-ECU is located in the hydraulic unit.
Pre-removal operation
• Brake fluid draining.
Post-installation operation
• Brake fluid refilling and air bleeding (Refer to GROUP 35A
− On-vehicle Service, Bleeding ).
• Hydraulic unit check (Refer to P.35B-59).
5
2
6
5
5
16 ± 3 N·m
5
9
1
3
10 ± 2 N·m
5
8
10
11
13 ± 2 N·m
7
4
24 ± 4 N·m
ACB06013 AB
ANTI-SKID BRAKING SYSTEM (ABS)
35B-62
<<A>>
<<B>>
HYDRAULIC UNIT
Removal steps
ABS-ECU harness connector
Suction pipe installation bolt
Wheel speed sensor harness
connector connection
4. Wheel speed sensor harness clip
connection
>>A<< 5. Brake tube connection
6. Brake tube and clip connection
7. Suction pipe, liquid pipe and clip
connection
8. Hydraulic unit (ABS-ECU) and
hydraulic unit bracket
9. Hydraulic unit (ABS-ECU)
10. Hydraulic unit bracket insulator
11. Hydraulic unit bracket
1.
2.
3.
REMOVAL SERVICE POINTS
<<A>> ABS-ECU HARNESS CONNECTOR
DISCONNECTION
<<B>> HYDRAULIC UNIT (ABS-ECU)
REMOVAL
•
•
•
•
CAUTION
Be careful when removing the hydraulic unit
because it is heavy.
Never loosen the nuts and the bolts because
the hydraulic unit cannot be disassembled.
Do not drop or shock the hydraulic unit.
Do not turn the hydraulic unit upside down or
lay down the unit because the inner air
becomes difficult to be bled.
INSTALLATION SERVICE POINT
>>A<< BRAKE TUBE CONNECTION
4
5
3
6
Lock lever
2
1
ACB04919AB
ACB04918AB
Operate the lock lever to disconnect the ABS-ECU
harness connector as shown in the figure.
Install the brake pipe to the hydraulic unit as shown
in the figure.
1. From master cylinder (primary) <Marking colour:
Blue and white>
2. From master cylinder (secondary) <Marking colour: Yellow and white>
3. To front brake (RH) <Marking colour: Orange>
4. To front brake (LH) <Marking colour: Red>
5. To rear brake (RH) <Marking colour: White>
6. To rear brake (LH) <Marking colour: Pink>
ANTI-SKID BRAKING SYSTEM (ABS)
35B-63
WHEEL SPEED SENSOR
WHEEL SPEED SENSOR
REMOVAL AND INSTALLATION <FRONT>
M1352008301659
CAUTION
The vehicle speed detection encoder collects any metallic particle easily, because it is magnetised.
Make sure that the encoder should not collect any metallic particle. Check that there is not any trouble prior to reassembling it.
Pre-removal and post-installation operation
Air cleaner body assembly removal and installation <Refer to
GROUP 15 − Air Cleaner > <Front wheel speed sensor
(LH)>.
2
3
13 ± 2 N·m
11 ± 2 N·m
3
4
5
1
4
8.5 ± 1.5 N·m
2
11 ± 2 N·m
5
1
13 ± 2 N·m
8.5 ± 1.5 N·m
ACB05594 AB
1.
2.
>>A<<
3.
4.
5.
Removal steps
Bolt (front wheel speed sensor and
knuckle connection)
Front wheel speed sensor
connector
Front wheel speed sensor grommet
Front wheel speed sensor
Harness clip
>>B<<
NOTE: The vehicle speed detection encoder is integrated with the front wheel bearing, which cannot be
disassembled.
INSTALLATION SERVICE POINTS
>>A<< FRONT WHEEL SPEED SENSOR
GROMMET INSTALLATION
Front wheel speed
sensor grommet
Body panel
AC900799AB
Install the front wheel speed sensor grommet to the
body panel snugly as shown in the figure.
ANTI-SKID BRAKING SYSTEM (ABS)
35B-64
WHEEL SPEED SENSOR
>>B<< HARNESS CLIP INSTALLATION
A
A
Wheel speed sensor
Section A - A
Harness clip
Marking
Wheel speed sensor harness
AC608814AB
Hydraulic unit
(integrated with
ABS-ECU)
Front wheel
speed sensor
Clip
Marking
(Color: White)
ACC00568AB
Install the front wheel speed sensor to the harness
clip as shown in the figure.
ANTI-SKID BRAKING SYSTEM (ABS)
35B-65
WHEEL SPEED SENSOR
REMOVAL AND INSTALLATION <REAR>
M1352008301660
CAUTION
The vehicle speed detection encoder collects any
metallic particle easily, because it is magnetized.
Make sure that the encoder should not collect
any metallic particle. Check that there is not any
trouble prior to reassembling it.
<2WD>
Pre-removal and post-installation operation
Quarter trim removal and installation (Refer to GROUP 52A
− Trim ).
5
3
4
3
N
2
4
1
1
8.5 ± 1.5 N·m
8.5 ± 1.5 N·m
5
N
2
ACB05519AB
>>B<< 1.
>>B<< 2.
3.
Removal steps
Bolt (rear wheel speed sensor
and trailing arm assembly
connection)
O ring
Rear wheel speed sensor
connector
>>A<< 4.
Removal steps (Continued)
Rear wheel speed sensor
grommet
Rear wheel speed sensor
>>B<< 5.
NOTE: The vehicle speed detection encoder is integrated with the rear hub assembly, which cannot be
disassembled.
ANTI-SKID BRAKING SYSTEM (ABS)
35B-66
WHEEL SPEED SENSOR
<4WD>
Pre-removal and post-installation operation
Quarter trim removal and installation (Refer to GROUP 52A
− Trim ).
3
2
3
2
4
1
4
1
ACB05520AB
>>C<<
1.
>>A<<
2.
3.
4.
Removal steps
Rear wheel speed sensor and
trailing arm assembly connection
Rear wheel speed sensor grommet
Rear wheel speed sensor
connector
Rear wheel speed sensor
NOTE: The vehicle speed detection encoder is integrated with the rear hub assembly, which cannot be
disassembled.
INSTALLATION SERVICE POINTS
>>A<< REAR WHEEL SPEED SENSOR
GROMMET INSTALLATION
Install the rear wheel speed sensor grommet to the
body panel snugly as shown in the figure.
>>B<< REAR WHEEL SPEED SENSOR,
O-RING, AND BOLT (CONNECTION OF
REAR WHEEL SPEED SENSOR WITH
REAR WHEEL HUB ASSEMBLY)
INSTALLATION
Rear wheel
speed sensor
Rear wheel
hub assembly
O ring
Rear wheel speed
sensor grommet
AC807126 AE
Body panel
AC900807AB
1. Align the mounting bolt hole position of rear wheel
speed sensor with the mounting bolt hole position
of rear wheel hub assembly.
ANTI-SKID BRAKING SYSTEM (ABS)
35B-67
WHEEL SPEED SENSOR
CAUTION
• Do not insert the rear wheel speed sensor at
an angle or by prying the sensor because it
may be possible that the O-ring of rear wheel
speed sensor cannot be mounted properly.
• After the insertion, do not perform an alignment of mounting bolt hole positions by rotating the rear wheel speed sensor.
INSPECTION
M1352008400750
WHEEL SPEED SENSOR CURRENT
CHECK
2. As shown in the figure, mount the rear wheel
speed sensor while keeping the sensor
perpendicular to the rear wheel hub assembly.
>>C<< REAR WHEEL SPEED SENSOR
INSTALLATION
MB992006
Rear wheel
hub assembly
Rear wheel speed sensor
AC705246 AC
AC507330 AB
Push the rear wheel speed sensor to the end and
install it securely.
CAUTION
• Do not connect the battery terminals in
reverse as the wheel speed sensor may be
damaged.
• When the current value is measured by the
wheel speed sensor connector, measure it
with the wheel speed sensor installed in the
vehicle.
1. Connect the circuit tester to the wheel speed
sensor using the special tool extra fine probe
(MB992006), and measure the sensor current as
a single unit.
Standard value: 5.9 to 8.4 mA or 11.8 to 16.8
mA
2. If the measurement value is not within the
standard value range, replace the wheel speed
sensor with a new one.
ANTI-SKID BRAKING SYSTEM (ABS)
35B-68
WHEEL SPEED SENSOR
WHEEL SPEED SENSOR INSULATION
CHECK
1. Connect the circuit tester to the wheel speed
sensor using the special tool extra fine probe
(MB992006), and measure the insulation
resistance between the terminal No. 1/2 and the
wheel speed sensor body as a single unit.
Standard value: 5 MΩ or more
2. If the insulation resistance is not within the
standard value range, replace the wheel speed
sensor with a new one.
<Front>
<Rear>
MB992006
AC507331AB
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