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)

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

STEP 1. Using Scan Tool MB991502, Carry Out 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.
If the solenoid clicks, go to Step 2.
If the clicks cannot be heard, repair or replace the torque converter clutch solenoid valve. Refer to Valve Body. Then confirm that the symptom is eliminated.

STEP 2. Does The Vibration Occur When The A/T Fluid Temperature Sensor Connector Has Been Disconnected?
If no, go to Step 3.
If yes, check the engine system.
Refer to <2.4L Engine>, Diagnosis - Symptom Chart - Driving or <3.0L Engine>, Diagnosis - Symptom Chart - Driving.
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.

STEP 3. Check The Torque Converter Hydraulic Pressure.
Measure the torque converter hydraulic pressure. Then check for if the torque converter hydraulic pressure is within the standard value. Refer to Hydraulic Pressure Test. If within the standard value, go to Step 4.
If not within the standard value, go to Step 5.

STEP 4. Replace The Torque Converter Assembly.





Remove the transaxle.
Replace the torque converter assembly. Refer to Transaxle. Then check for the symptom.
If the symptom is eliminated, diagnosis is complete. If the symptom is not eliminated, go to Step 6.

STEP 5. Disassemble And Clean The Valve Body.





Check the O-ring installation bolts for looseness and valve body for damage. Repair or replace the faulty parts. Refer to Valve Body.
If repair is not possible, replace the valve body assembly. Then check for the symptom.
If the symptom is eliminated, diagnosis is complete. If the symptom is not eliminated, go to Step 6.

STEP 6. Replace the PCM.
Replace the PCM. On 2000 models, the immobilizer-ECU should be replaced together with it. Refer to Ignition Switch and Immobilizer System. Confirm that the malfunction symptom is eliminated.
If malfunction is eliminated, diagnosis is complete.