NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION [GF4AX-EL]


16	Judder upon torque converter clutch (TCC) operation
DESCRIPTION	• Vehicle jolts when TCC engaged.
POSSIBLE CAUSE	• Poor TCC engagement due to slippage because the TCC is stuck or 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. 1. Torque converter clutch piston slippage, burnt • Line pressure low • TP sensor malfunction or mis-adjustment • VSS malfunction • Input/turbine speed sensor malfunction • Sensor GND malfunction • TCC solenoid valve malfunction • Control valve body malfunction 2. Torque converter malfunction Note • Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted.


STEP	INSPECTION		ACTION
1	Connect the WDS or equivalent to DLC-2. Inspect for abnormal value change at the following PCM PIDs when judder occurs. • TFT • TP • TSS • VSS Are the PIDs values normal?	Yes	Go to the next step.
1		No	Inspect for intermittent open or short of related wiring harness and sensor.
2	Turn the ignition switch to the ON position. Connect the WDS or equivalent to DLC-2. Simulate TCC PID for ON. Is operating sound of the TCC control solenoid heard?	Yes	Go to the next step.
2		No	Inspect connection of the TCC control solenoid terminal on the ATX for bent terminals, damage, corrosion or looseness. Inspect for stuck TCC control solenoid valve? (See Operating Inspection (On-vehicle Inspection).) If the shift solenoids are normal, inspect for open or short circuit between the PCM terminal 65 and the TCC control solenoid valve terminal D.
3	Remove the torque converter. Inspect the torque converter. (See ATX Workshop Manual (GF4AX-EL)) Is the torque converter normal?	Yes	Replace the control valve body and repair or replace any malfunctioning parts. (See ATX Workshop Manual (GF4AX-EL)) If any problem remains, replace the transaxle and repair or replace any malfunctioning parts. (See ATX Workshop Manual (GF4AX-EL))
3		No	Replace the torque converter.
4	• Verify the 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 is completed. • If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.