INSPECTION PROCEDURE 6: Shift Shock when Shifting from "N" to "D" and Long Delay: Diagnosis

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

Required Special Tools:

MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, check actuator test item 2: Underdrive Solenoid Valve.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to the actuator test mode.
  - Item 2: Underdrive Solenoid Valve.
    - An audible clicking or buzzing should be heard when the underdrive solenoid valve is energized.
4. Turn the ignition switch to the "LOCK" (OFF) position.
  Q: Is the solenoid valve operating properly?
  1. YES: Go to Step 2.
  2. NO: Repair or replace the underdrive solenoid valve. Refer to VALVE BODY <4A/T> or Refer to VALVE BODY <5A/T>. Then confirm that the symptom is eliminated.
    
    Fig 1: Connecting Special Tool MB991910 To Data Link Connector
    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Check when shift shock occurs.
Q: When does the shift shock occur?

When engaging from "N" to "D": Go to Step 3.

When the vehicle starts moving: Go to Step 6.
STEP 3. Check the hydraulic pressure (for underdrive clutch).
Measure the hydraulic pressure for underdrive clutch when the selector lever is shifted from "N" to "D" range. Check if the hydraulic pressure is within the standard value. Refer to , HYDRAULIC PRESSURE TEST .

Q: Is the hydraulic pressure within the standard value?
1. YES: Go to Step 4.
2. NO: Go to Step 8.
STEP 4. Check the underdrive clutch system.
1. Remove the valve body cover and valve body. Refer to TRANSAXLE <4A/T> or TRANSAXLE <5A/T>.
2. Blow 108 kPa (15 psi) compressed air into the underdrive clutch oil orifice of the transaxle case, and check if the underdrive clutch piston moves and air pressure is maintained in that condition.
  Q: Is the air pressure maintained?
  1. YES: Go to Step 8.
  2. NO: Go to Step 5.
    
    Fig 2: Locating Underdrive Clutch Oil Orifice
    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 5. Check the underdrive clutch.
1. Remove the transaxle assembly.
2. Check the facing for seizure and the piston seal ring for damage and interference with the retainer. Repair or replace the faulty parts. Refer to UNDERDRIVE CLUTCH AND INPUT SHAFT <4A/T> or Refer to UNDERDRIVE CLUTCH AND INPUT SHAFT <5A/T>. Then check the symptom.
  Q: Is the symptom eliminated?
  1. YES: The procedure is complete.
  2. NO: Go to Step 9.
    
    Fig 3: Locating Underdrive Clutch
    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 6. Check shift shock.
Q: Does shift shock occur?
1. YES: Go to Step 7.
2. NO: Go to Step 8.
STEP 7. Using scan tool MB991958, check data list item 2: TP Sensor.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to the data reading mode.
  - Item 2: TP Sensor.
    - With the throttle valve in idle position, voltage should measure between 300 and 700 mV.
    - With the throttle valve in full-open position, voltage should measure 4,000 mV or more.
4. Turn the ignition switch to the "LOCK" (OFF) position.
  
  Fig 4: Connecting Special Tool MB991910 To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  
  Q: Is the measured voltage between 300 and 700 mV at idle, and 4,000 mV or more at the full-open position?
  1. YES: Go to Step 8.
  2. NO: Check the TP sensor. Refer to DTCS P0122 , DTC P0123: TP SENSOR SYSTEM for 2.4L Engine , or Refer to DTCS P0122 , DTC P0123: TP SENSOR SYSTEM for 3.8L Engine . Then check the symptom.
STEP 8. 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 <4A/T> or Refer to 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: Replace the valve body assembly. Then check the symptom. Go to Step 9.
  
  Fig 5: Identifying Valve Body Assembly
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 9. 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.