Inspection Procedure 8
INSPECTION PROCEDURE 8: Shift Shock when Shifting from "N" to "D," "N" to "R" and Long DelayCOMMENT
If abnormal shock or delay of two seconds or more occurs when the selector lever is moved from "N" to "D" range or from "N" to "R" range while the engine is idling, the cause is probably abnormal line pressure or a malfunction of the oil pump or valve body.
TROUBLESHOOTING HINTS (The most likely causes for this case:)
^ Abnormal line pressure
^ Malfunction of the oil pump
^ Malfunction of the valve body
^ Malfunction of the PCM
DIAGNOSIS
STEP 1. Check the hydraulic pressure.
1) 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.
2) If some elements pressures are within the standard value and some are not, recheck the symptom.
Q: Are all hydraulic pressures within the standard value?
YES: Go to Step 3.
NO: Go to Step 2.
STEP 2. Adjust line pressure.
Adjust line pressure. Then check the symptom.
Q: Is the symptom eliminated?
YES: The procedure is complete.
NO: Go to Step3.
STEP 3. Check when shift shock occurs.
Q: When does the shift shock occur?
When engaging from "N" to "D" and "N" to "R": Go to Step 4.
When the vehicle starts moving: Go to Step 5.
STEP 4. Replace the oil pump.
1) Remove the transaxle.
2) Replace the oil pump. (Oil pump cannot be repaired). Then check the symptom.
Q: Is the symptom eliminated?
YES: The procedure is complete.
NO: Go to Step 6.
STEP 5. Disassemble and clean the valve body.
Check the installation bolts for looseness and the O-ring, valves 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 check the symptom.
Q: Is the symptom eliminated?
YES: The procedure is complete.
NO: Go to Step 6.
STEP 6. Replace the PCM.
Q: Is the symptom eliminated?
YES: The procedure is complete.
NO: Start over at Step 1.