INSPECTION PROCEDURE 8: Shift Shock when Shifting from "N" to "D," "N" to "R" and Long Delay: Diagnosis

WARNING: This page is about a different variant/trim than selected.

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 pressures are within the standard value and some are not, recheck the symptom.
  Q: Are all hydraulic pressures within the standard value?
  1. YES: Go to Step 3.
  2. NO: Go to Step 2.
STEP 2. Adjust line pressure.
Adjust line pressure. Refer to , LINE PRESSURE ADJUSTMENT . Then check the symptom.

Q: Is the symptom eliminated?
1. YES: The procedure is complete.
2. NO: Go to Step 3.
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. 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 disassembly). Refer to TRANSAXLE <4A/T> or Refer to TRANSAXLE <5A/T>. Confirm that the malfunction symptom is eliminated.
  Q: Is the symptom eliminated?
  1. YES: The procedure is complete.
  2. NO: Go to Step 6.
    
    Fig 1: Locating Oil Pump
    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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. Refer to VALVE BODY <4A/T> or VALVE BODY <5A/T>.

Replace the valve body assembly if the damages are thought to be irreparable. Then check the symptom.

Q: Is the symptom eliminated?
1. YES: The procedure is complete.
2. NO: Go to Step 6.
  
  Fig 2: Identifying Valve Body Assembly
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 6. Replace the PCM.
When the PCM is replaced, register the encrypted code. Refer to ENCRYPTED CODE REGISTRATION CRITERIA TABLE .

Q: Is the symptom eliminated?
1. YES: The procedure is complete.
2. NO: Start over at Step 1.