NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION [AY6A-EL, AY6AX-EL]

id0503k3802100

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 ground less than 5.0 ohms? | Yes | Go to the next step.
No | Repair open ground circuit.
2 | • Inspect the TCC solenoid. (See TORQUE CONVERTER CLUTCH (TCC) CONTROL SOLENOID INSPECTION [AY6A-EL, AY6AX-EL].) • 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 [AY6A-EL, AY6AX-EL].)
3 | • Perform the stall test. (See MECHANICAL SYSTEM TEST [AY6A-EL, AY6AX-EL].) • Is the stall speed within the specified? | Yes | Inspect the ATF condition. If large amount of metal specks are found, replace the transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].) If a large amount of metal specks are not found, replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].)
No | Replace the torque converter. (See TORQUE CONVERTER REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].)
4 | • Verify test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If malfunction remains, inspect the related Service Bulletins and/or On-line Repair 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.