Inspection Procedure 4: Does Not Move (Forward or Backward)

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 powertrain, oil pump or valve body.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CONDITION:)
^ Abnormal line pressure
^ Malfunction of the powertrain
^ Malfunction of the oil pump
^ Malfunction of the valve body
^ Low transmission fluid level
^ Malfunction of the PCM

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. If some elements pressures are within the standard value and some are not, recheck the symptom.
Q: Are all pressures within the standard value?
YES: Check transmission fluid level and condition. If not OK, repair or replace as necessary, then retest the system. If OK, go to Step 3.
NO: Go to Step 2.

STEP 2. Disassemble and clean the valve body.





Check the O-ring installation bolts for looseness and valve body for damage. Repair or replace the faulty parts. Replace the valve body assembly if the damages are thought to be irreparable. Then retest the symptom.
Q: Is the symptom eliminated?
YES: The procedure is complete.
NO: Go to Step 4.

STEP 3. Check the transaxle powertrain components.





Disassemble the transaxle and check the planetary gear and output shaft, etc. Repair or replace the damaged parts. Then check the symptom.
Q: Is the symptom eliminated?
YES: The procedure is complete.
NO: Go to Step 5.

STEP 4. Check the oil pump.
1) Remove the transaxle.
2) Check the oil pump (incorrect installation, damage and etc.) and replace the oil pump assembly if necessary (The oil pump cannot be disassembled). Confirm that the malfunction symptom is eliminated.
Q: Is the symptom eliminated?
YES: The procedure is complete.
NO: Go to Step 5.

STEP 5. Replace the PCM.
When the PCM is replaced, register the encrypted code.
Q: Is the symptom eliminated?
YES: The procedure is complete.
NO: Start over at Step 1.