Inspection Procedure 4

INSPECTION PROCEDURE 4
Does Not Move (Forward Or Backward)

COMMENT
If the vehicle does not move forward or backward when the selector lever is shifted to any position while the engine is idling, the cause is probably abnormal line pressure, or a malfunction of the power train, oil pump or valve body.

TROUBLESHOOTING HINTS
The most likely causes for this case:
- Abnormal line pressure
- Malfunction of the power train
- Malfunction of the oil pump
- Malfunction of the valve body
- Malfunction of the PCM Low A/T fluid level

DIAGNOSIS
STEP 1. Check The Hydraulic Pressure.
Measure the hydraulic pressure of each element when the transaxle is in 1st, 2nd or reverse. Check if each hydraulic pressure is within the standard value. Refer to Hydraulic Pressure Test.
If all are not within the standard value, go to Step 2.
If all are within the standard value, check A/T fluid level and condition. If not OK, repair or replace as necessary, then recheck symptom. If OK, go to Step 3.
If some elements are within the standard value and some are not, recheck the symptom.

STEP 2. Disassemble And Clean The Valve Body.





Check the O-ring installation bolts for looseness and the valve body for damage. Repair or replace the faulty parts. Refer to Valve Body.
If repair is not possible, replace the valve body assembly. Then check for the symptom.
If the symptom is eliminated, diagnosis is complete.
If the symptom is not eliminated, go to Step 4.

STEP 3. Check The Transaxle Power Train Components.





Disassemble the transaxle and check the planetary carrier, output shaft and differential, etc. Repair or replace the damaged parts. Refer to Transaxle, Planetary Carrier Assembly, Output Shaft, Differential. Then check for the symptom.
If the symptom is eliminated, diagnosis is complete.
If the symptom is not eliminated, go to Step 5.

STEP 4. Replace The Oil Pump.





Remove the transaxle.
Replace the oil pump (Oil pump cannot be repaired). Refer to Transaxle. Then check for the symptom.
If the symptom is eliminated, diagnosis is complete.
If the symptom is not eliminated, go to Step 5.

STEP 5. Replace the PCM.
Replace the PCM. On 2000 models, the immobilizer-ECU should be replaced together with it. Refer to Ignition Switch and Immobilizer System. Confirm that the malfunction symptom is eliminated.
If malfunction is eliminated, diagnosis is complete.