Description CONSULT-II Reference Value in Data

Description CONSULT-II Reference Value in Data
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Description
Description
NAEC0826
SYSTEM DESCRIPTION
GI
NAEC0826S01
Sensor
ECM function
Input Signal to ECM
MA
Actuator
Heated
oxygen
Heated oxygen sensor 1 heatsensor 1
ers
heater control
Crankshaft position sensor (POS)
Engine speed
Crankshaft position sensor (REF)
EM
LC
The ECM performs ON/OFF control of the heated oxygen sensor 1 heaters corresponding to the engine speed.
OPERATION
NAEC0826S02
Engine speed
rpm
FE
Heated oxygen sensor 1 heaters
Above 3,600
OFF
Below 3,600
ON
CL
CONSULT-II Reference Value in Data Monitor
Mode
MT
NAEC0827
Specification data are reference values.
MONITOR ITEM
HO2S1 HTR (B1)
HO2S1 HTR (B2)
CONDITION
AT
SPECIFICATION
I Engine speed: Below 3,600 rpm
ON
I Engine speed: Above 3,600 rpm
OFF
TF
ECM Terminals and Reference Value
NAEC0828
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TERMINAL
NO.
3
2
WIRE
COLOR
L/OR
R/G
P0031
0031
(Bank 1)
P0051
0051
(Bank 2)
AX
SU
ITEM
CONDITION
Heated oxygen sensor
1 heater (bank 1)
Heated oxygen sensor
1 heater (bank 2)
DATA (DC Voltage)
BR
[Engine is running]
I Engine speed is below 3,600 rpm.
0 - 1.0V
[Engine is running]
I Engine speed is above 3,600 rpm.
BATTERY VOLTAGE
(11 - 14V)
ST
[Engine is running]
I Engine speed is below 3,600 rpm.
0 - 1.0V
RS
[Engine is running]
I Engine speed is above 3,600 rpm.
BATTERY VOLTAGE
(11 - 14V)
BT
On Board Diagnosis Logic
DTC No.
PD
Trouble diagnosis
name
Heated oxygen sensor 1 heater control
circuit low
DTC Detecting Condition
The current amperage in the heated oxygen sensor 1 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM
through the heated oxygen sensor 1 heater.)
NAEC0829
HA
Possible Cause
I Harness or connectors
(The heated oxygen sensor 1 heater
circuit is open or shorted.)
I Heated oxygen sensor 1 heater
SC
EL
IDX
EC-169
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
On Board Diagnosis Logic (Cont’d)
DTC No.
P0032
0032
(Bank 1)
P0052
0052
(Bank 2)
Trouble diagnosis
name
Heated oxygen sensor 1 heater control
circuit high
DTC Detecting Condition
Possible Cause
The current amperage in the heated oxygen sen- I Harness or connectors
sor 1 heater circuit is out of the normal range.
(The heated oxygen sensor 1 heater
(An excessively high voltage signal is sent to ECM
circuit is shorted.)
through the heated oxygen sensor 1 heater.)
I Heated oxygen sensor 1 heater
DTC Confirmation Procedure
NAEC0830
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at idle.
WITH CONSULT-II
SEF058Y
1)
2)
3)
WITH GST
1)
2)
3)
4)
5)
I
NAEC0830S01
Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.
Start engine and run it for at least 6 seconds at idle speed.
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-173.
NAEC0830S02
Start engine and run it for at least 6 seconds at idle speed.
Turn ignition switch “OFF” and wait at least 10 seconds.
Start engine and run it for at least 6 seconds at idle speed.
Select “MODE 3” with GST.
If DTC is detected, go to “Diagnostic Procedure”, EC-173.
When using GST, “DTC Confirmation Procedure” should
be performed twice as much as when using CONSULT-II
because GST cannot display MODE 7 (1st trip DTC) concerning this diagnosis. Therefore, using CONSULT-II is
recommended.
EC-170
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Wiring Diagram
Wiring Diagram
BANK 1
NAEC0831
GI
NAEC0831S01
MA
EM
LC
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
MEC526D
EC-171
IDX
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Wiring Diagram (Cont’d)
BANK 2
NAEC0831S02
MEC671D
EC-172
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Diagnostic Procedure
Diagnostic Procedure
1
NAEC0832
GI
CHECK HO2S1 POWER SUPPLY CIRCUIT
MA
1. Turn ignition switch “OFF”.
2. Check heated oxygen sensor 1 harness protector color.
EM
LC
FE
SEF505YC
3. Disconnect corresponding heated oxygen sensor 1 harness connector.
CL
MT
AT
TF
SEF965YA
PD
AX
SU
BR
SEF966YA
ST
4. Turn ignition switch “ON”.
5. Check voltage between HO2S1 terminal 1 and ground with CONSULT-II or tester.
RS
BT
HA
SEF970Y
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
SC
EL
IDX
EC-173
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Diagnostic Procedure (Cont’d)
2
DETECT MALFUNCTIONING PART
Check the following.
I Harness connectors M32, F23
I Fuse block (J/B) connector M10
I 15A fuse
I Harness for open or short between heated oxygen sensor 1 and fuse
©
3
Repair harness or connectors.
CHECK HO2S1 OUTPUT CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal and HO2S1 terminal as follows.
Refer to Wiring Diagram.
MTBL1195
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 4.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
4
CHECK HEATED OXYGEN SENSOR 1 HEATER
Check resistance between HO2S1 terminals as follows.
SEF969Y
CAUTION:
Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
OK or NG
OK
©
GO TO 6.
NG
©
GO TO 5.
EC-174
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Diagnostic Procedure (Cont’d)
REPLACE HEATED OXYGEN SENSOR 1
GI
1. Turn ignition switch “OFF”.
2. Check heated oxygen sensor 1 harness protector color.
MA
5
EM
LC
SEF505YC
CAUTION:
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool
J-43897-18 or J-43897-12 and approved anti-seize lubricant.
©
FE
CL
Replace malfunctioning heated oxygen sensor 1.
MT
6
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-154.
©
AT
INSPECTION END
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
EC-175
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