Mitsubishi Grandis. Manual - part 858
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-99
STEP 2. Engine-A/T-ECU replacement
(1) Replace the engine-A/T-ECU.
(2) Test drive the vehicle.
(3) Verify that the condition described by the
customer exists.
Q: Does a malfunction take place again?
YES :
Go to Step 1.
NO :
The inspection is complete.
INSPECTION PROCEDURE 15: Vibration
COMMENTS ON TROUBLE SYMPTOM
If vibration occurs when driving at constant speed or
when acceleration in high range, the cause is
probably an abnormal torque converter pressure, or
a malfunction of the engine system, damper clutch
solenoid valve, valve body or torque converter.
POSSIBLE CAUSES
• Malfunction of damper clutch solenoid valve
• Malfunction of engine system
• Abnormal torque converter pressure
• Malfunction of valve body
• Malfunction of torque converter
• Malfunction of the engine-A/T-ECU
DIAGNOSIS
STEP 1. Check when the vibration occurs.
Q: Does the vibration occur when the damper clutch
is operating?
YES :
Go to Step 3.
NO :
Go to Step 2.
STEP 2. Engine system check
Q: Is the check result normal?
YES :
The inspection is complete.
NO :
Repair the engine system.
STEP 3. Engine-A/T-ECU replacement
(1) Replace the engine-A/T-ECU.
(2) Test drive the vehicle.
(3) Verify that the condition described by the
customer exists.
Q: Does a malfunction take place again?
YES :
Go to Step 4.
NO :
The inspection is complete.
STEP 4. Torque converter check
Check for damaged drive plate, incorrect installation
in the input shaft (inserted at an angle), damaged
splines or damper clutch sealing.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
If repair is possible, repair the damaged
part. If repair is not possible because the
splines on the drive plate or torque
converter are damaged, replace it.
STEP 5. Valve body disassembly clean and
assembly
Check the bolts for looseness and the O-ring,
solenoid valves, springs and valve body for damage.
Q: Is the check result normal?
YES :
The inspection is complete.
NO :
Replace the valve body assembly if the
damages are thought to be irreparable.