Inspection
Procedure 3: Does not Move Forward
COMMENTS ON TROUBLE SYMPTOM
If the vehicle does not move forward when the selector lever is shifted to D, sport mode
L, or 2 range while the engine is idling, the cause is probably abnormal line pressure or a
malfunction of the underdrive clutch or valve body.PROBABLE CAUSES
- Malfunction of underdrive solenoid valve
- Malfunction of inhibitor switch
- Abnormal line pressure
- Malfunction of the underdrive clutch
- Malfunction of valve body
- Malfunction of the oil pump
- Malfunction of the engine-A/T-ECU
DIAGNOSIS PROCEDURE
STEP 3. Underdrive solenoid valve check
- Turn the ignition switch to the ON position.
- Shift the selector lever from N to D range.
- Confirm the operating sound of the underdrive solenoid valve.
OK: Operating sound can be heard.
Q: Is the check result normal?
YES:
Go to Step 4
.NO: Replace the engine-A/T-ECU.
STEP 6. Valve body disassembly clean and assembly
- Check the bolts for looseness and the O-ring, solenoid valve and valve body for damage.
Replace the valve body assembly if the damages are thought to be irreparable.
- Test drive the vehicle.
- Verify that the condition described by the customer exists.
Q: Does a malfunction take place again?
YES:
Go to Step 7.NO: The inspection is complete.
STEP 8. Underdrive clutch check
- Check the facing for seizure and the piston seal ring for damage and interference with the retainer.
- Test drive the vehicle.
- Verify that the condition described by the customer exists.
Q: Is the check result normal?
YES:
The inspection is complete.NO: Repair or replace the underdrive clutch.