NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION [AW6A-EL, AW6AX-EL]

id050310802100

16
Judder upon torque converter clutch (TCC) operation
DESCRIPTION
•  Vehicle jolts when TCC is engaged.
POSSIBLE CAUSE
•  Poor TCC engagement due to either slippage because the TCC piston is stuck or the line pressure is low.
Caution
•  If the TCC is stuck, inspect it. In addition, inspect the oil cooler for foreign particles which may have mixed in with the ATF.
―  TCC slippage, burnt
•  Line pressure low
•  Incorrect accelerator opening signal
•  VSS malfunction
•  Input/turbine speed sensor malfunction
•  Sensor ground malfunction
•  TCC control solenoid malfunction
•  Control valve body malfunction
―  Torque converter malfunction
―  Centrifugal hydraulic pressure clutch is not operating properly

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Disconnect the TCM.
•  Is the resistance between the TCM ground terminal A9 and the body GND less than 5.0 ohms?
Yes
Go to the next step.
No
Repair the open ground circuit.
2
•  Inspect the TCC solenoid.
•  Is the TCC solenoid normal?
Yes
Go to the next step.
No
Inspect the coupler component.
If normal, replace the control valve body.
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [AW6A-EL, AW6AX-EL].)
3
•  Perform the stall test.
•  Is the stall speed below specified value?
Yes
Inspect the ATF condition.
•  If large amount of metal specks are found, overhaul the transaxle and repair or replace any malfunctioning parts.
(See Automatic Transaxle and Transfer Workshop Manual [AW6-EL, AW6X-EL].)
•  If a large amount of metal specks are not found, replace the control valve body.
No
Replace the torque converter.
(See TORQUE CONVERTER REMOVAL/INSTALLATION [AW6A-EL, AW6AX-EL].)
4
•  Verify test results.
―  If normal, return to the diagnostic index to service any additional symptoms.
―  If the malfunction remains, inspect the related Service Information and perform repair or diagnosis.
•  If the vehicle is repaired, troubleshooting completed.
•  If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.