Inspection Procedure 8
INSPECTION PROCEDURE 8: Shift Shock when Shifting from "N" to "D," "N" to "R" and Long DelayCOMMENT
If abnormal shocks or delay of two seconds or more occurs when the selector lever is moved from "N" to "D" range and 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 code to be set:)
- 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. Refer to, Hydraulic Pressure Test.
2. If some elements 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.
Refer to Line Pressure Adjustment. Then check the symptom.
Q: Is the symptom eliminated?
YES: Diagnosis is complete.
NO: Go to Step 3.
STEP 3. Check when shift shocks occurs.
Q: When does the shift shocks 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: Diagnosis 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.
Q: Is the repair possible and the symptom eliminated?
YES: Diagnosis is complete.
NO: Replace the valve body assembly. Then check the symptom. Go to Step 6.
STEP 6. Replace the PCM.
Q: Is the symptom eliminated?
YES: Diagnosis is complete.
NO: Start over at Step 1.