AUTOMATIC TRANSAXLE SYSTEM AX–81

AUTOMATIC TRANSAXLE SYSTEM AX–81
U140F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
DTC
P0766
AX–81
Shift Solenoid "D" Performance (Shift Solenoid
Valve S4)
SYSTEM DESCRIPTION
The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual
gear position (1st, 2nd, 3rd or O/D gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
problems of the shift solenoid valves, valve body or automatic transaxle (clutch, brake, gear, etc.).
DTC No.
DTC Detection Condition
Trouble Area
P0766
Gear required by the ECM does not match the
actual gear when driving (2 trip detection
logic)
•
•
•
•
•
Shift solenoid valve S4 remains open or
closed
Valve body is blocked
Shift solenoid valve S4
Automatic transaxle (clutch, brake, gear,
etc.)
ECM
MONITOR DESCRIPTION
This DTC indicates a stuck OFF malfunction of the shift solenoid valve S4, stuck ON malfunction of the
shift solenoid valve SL2, or brake control valve malfunction. The ECM commands gear shifts by turning
the shift solenoid valves ON/OFF. When the gear position commanded by the ECM and the actual gear
position are not the same, the ECM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
Related DTCs
P0766:
Shift solenoid valve S4/ON malfunction
Shift solenoid valve S4/OFF malfunction
Required sensors/Components
Shift solenoid valve S4, Speed sensor (NT), Speed sensor (NC),
Crankshaft position sensor (NE)
Frequency of operation
Continuous
Duration
1 sec.
MIL operation
2 driving cycles
Sequence of operation
None
TYPICAL ENABLING CONDITIONS
All
Transmission range
"D"
ECT (Engine coolant temperature)
60°C (140°F) or more
ATF temperature
-20°C (-4°F) or more
ATF temperature circuit
Not circuit malfunction
ECT sensor circuit
Not circuit malfunction
Turbine speed sensor circuit
Not circuit malfunction
Intermediate shaft speed sensor circuit
Not circuit malfunction
Output speed sensor circuit
Not circuit malfunction
Shift solenoid valve SL1 circuit
Not circuit malfunction
Shift solenoid valve SL2 circuit
Not circuit malfunction
Shift solenoid valve S4 circuit
Not circuit malfunction
Electric throttle control system
Not circuit malfunction
OFF malfunction
ECM selected gear
4th
AX
AX–82
U140F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
Vehicle speed
10 km/h (6.2 mph) or more
Throttle valve opening angle
5% or more
ON malfunction
ECM selected gear
3rd
Vehicle speed
10 km/h (6.2 mph) or more
Throttle valve opening angle
5% or more
TYPICAL MALFUNCTION THRESHOLDS
Either of the following conditions is met:
OFF malfunction or ON malfunction
2 detections are necessary per driving cycle:
1st detection: temporary flag ON
2nd detection: pending fault code ON
OFF malfunction
Intermediate shaft speed/Output speed
1.34 to 1.48
ON malfunction
Intermediate shaft speed/Output speed
0.95 to 1.09
INSPECTION PROCEDURE
HINT:
Performing the intelligent tester's ACTIVE TEST allows relay, VSV, actuator and other items to be
operated without removing any parts. Performing the ACTIVE TEST early in troubleshooting is one way to
save time.
The DATA LIST can be displayed during the ACTIVE TEST.
1. Warm up the engine.
2. Turn the ignition switch OFF.
3. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
4. Turn the ignition switch ON and turn the tester ON.
5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST.
6. Follow the instructions on the tester and perform the ACTIVE TEST.
HINT:
While driving, the shift position can be forcibly changed with the tester.
Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you
to confirm the problem (see page AX-31).
AX
Item
Test Details
Diagnostic Note
SHIFT
[Test Details]
Operate the shift solenoid valve and set each
shift lever position by yourself
[Vehicle Condition]
• IDL: ON
• 50 km/h (31 mph) or less
[Other information]
• Press "→" button: Shift up
• Press "←" button: Shift down
Possible to check the operation of the shift
solenoid valves
HINT:
• This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
• The shift position commanded by the ECM is shown in the DATA LIST/SHIFT display on the tester.
U140F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
1
AX–83
CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0766)
(a) Connect the intelligent tester to the CAN VIM. Then
connect the CAN VIM to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(d) Read the DTCs using the tester.
Result
Display (DTC output)
Proceed to
Only P0766 is output
A
P0766 and other DTCs are output
B
HINT:
If any other codes besides P0766 are output, perform
troubleshooting for those DTCs first.
B
GO TO DTC CHART
A
2
INSPECT SHIFT SOLENOID VALVE S4
(+)
(-)
G028386E02
(a) Remove the shift solenoid valve S4.
(b) Measure the resistance between the solenoid valve
terminal and solenoid valve body.
Standard resistance:
11 to 15 Ω at 20°C (68°F)
(c) Connect the battery's positive (+) lead to the terminal of
the solenoid valve connector, and the negative (-) lead to
the solenoid body. Then check that the valve moves and
makes an operating noise.
OK:
Valve moves and makes operating noise.
NG
REPLACE SHIFT SOLENOID VALVE S4
OK
3
INSPECT TRANSMISSION VALVE BODY ASSEMBLY
(a) Check the transmission valve body assembly.
OK:
There are no foreign objects on each valve.
NG
OK
REPAIR OR REPLACE TRANSMISSION
VALVE BODY ASSEMBLY
AX
AX–84
4
U140F AUTOMATIC TRANSAXLE – AUTOMATIC TRANSAXLE SYSTEM
INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY
(a) Check the torque converter clutch assembly (see page
AX-153).
OK:
The torque converter clutch operates normally.
NG
REPLACE TORQUE CONVERTER CLUTCH
ASSEMBLY
OK
REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY
AX
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