Inspection Procedure 14

INSPECTION PROCEDURE 14: Vibration

COMMENT
If vibration occurs when driving at constant speed or when accelerating in 4th gear, abnormal torque converter clutch pressure or a malfunction of the engine system, torque converter clutch solenoid, torque converter or valve body may exist.

TROUBLESHOOTING HINTS (The most likely causes for this case:)
- Abnormal torque converter clutch pressure
- Malfunction of the engine system
- Malfunction of the torque converter clutch solenoid
- Malfunction of the torque converter
- Malfunction of the valve body
- Malfunction of the PCM

DIAGNOSIS

Required Special Tool:
- MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check actuator test item 06: Torque Converter Clutch Solenoid Valve.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.





1) Connect scan tool MB991502 to the data link connector.
2) Turn the ignition switch to the "ON" position.
3) Set scan tool MB991502 to actuator test mode for item 06: Torque Converter Clutch Solenoid Valve.
- An audible clicking or buzzing should be heard when the torque converter clutch solenoid valve is energized.

4) Turn the ignition switch to the "LOW (OFF) position.

Q: Is the solenoid valve operating properly?
YES: Go to Step 2.
NO: Repair or replace the torque converter clutch solenoid valve. Then confirm that the symptom is eliminated.

STEP 2. Check the vibration.
Q: Does the vibration occur when the A/T fluid temperature sensor connector has been disconnected?
YES: Check the engine system. Refer to Diagnosis - Symptom Chart - Driving. If the inspection result is not good, diagnose, repair, and/or replace the engine component(s).
NO: Go to Step 3.

STEP 3. Check the torque converter hydraulic pressure.
Measure the torque converter hydraulic pressure. Then check if the torque converter hydraulic pressure is within the standard value.

Q: Is the torque converter hydraulic pressure within the standard value?
YES: Go to Step 4.
NO: Go to Step 5.

STEP 4. Replace the torque converter assembly.
1) Remove the transaxle.





2) Replace the torque converter assembly. 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 O-ring installation bolts for looseness and the valve body for damage. Repair or replace the faulty parts. Replace the bulb body assembly if the damages are thought to be irreparable. Then check the symptom.

Q: Is the symptom eliminated?
YES: Diagnosis is complete.
NO: Go to Step 6.

STEP 6. Replace the PCM.
Q: Is the symptom eliminated?
YES: Diagnosis is complete.
NO: Start over at Step 1.