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 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 CONDITION:)

- 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 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 6: Torque Converter Clutch Solenoid Valve.





(1)
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.

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 6: 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 "LOCK" (OFF) position.

Q. Is the solenoid valve operating properly?

YES Go to Step 2.

NO Repair or replace the torque converter clutch solenoid valve. Valve Body Disassembly and Assembly [4A/T] or Valve Body [5A/T].
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. Symptom Chart or refer to [3.8L Engine], Diagnosis - Symptom Chart - Driving Symptom Chart.
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. Refer to Hydraulic Pressure Test, Hydraulic Pressure Test.

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. Transaxle Disassembly and Assembly [4A/T] or Transaxle [5A/T]. Then check the symptom.

Q. Is the symptom eliminated?

YES The procedure 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. Valve Body Disassembly and Assembly [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?

YES The procedure is complete.

NO Go to Step 6.

STEP 6. Replace the PCM.

When the PCM is replaced, register the encrypted code. Immobilizer System.

Q. Is the symptom eliminated?

YES The procedure is complete.
NO Start over at Step 1.