Inspection Procedure 14
INSPECTION PROCEDURE 14: VibrationCOMMENT
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)
CAUTION: To prevent damage to the scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting the scan tool MB991502.
STEP 1. Using scan tool MB991502, carry out the actuator test.
1) Connect scan tool MB991502 to the data link connector.
2) Check the following item in the actuator test. Refer to Actuator Test Reference Table. Item 6: Torque converter clutch solenoid valve
3) Check that the solenoid valve clicks.
Q: Does the solenoid click?
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 transmission fluid temperature sensor connector has been disconnected?
YES: Check the engine system. If the inspection result is not good, diagnose, repair, and/or replace the engine component(s). If the inspection result is good, go to Step 3.
NO: Go to Step 3.
STEP 3. Check the torque converter hydraulic pressure.
1) 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 transmission.
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.
1) Check the O-ring installation bolts for looseness and the 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.
1) Replace the PCM. The immobilizer-ECU and the ignition key should be replaced together with it. Confirm that the malfunction symptom is eliminated.
Q: Is the symptom eliminated?
YES: Diagnosis is complete.
NO: Start over at Step 1.