NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION [FS5A-EL]


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 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. 1. Torque converter clutch piston slippage, burnt • Line pressure high • Shift solenoid A malfunction • Shift solenoid E malfunction • Control valve body malfunction • Body GND malfunction • Pressure control solenoid A malfunction 2. Signal malfunction • Vehicle speed sensor malfunction • Sensor GND malfunction • TFT sensor malfunction • APP sensor malfunction • TP sensor malfunction • Input/turbine speed sensor malfunction 3. 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	Inspect the value at the following TCM PID using the WDS or equivalent. (See TCM INSPECTION [FS5A-EL].) • TSS Is the PID value normal?	Yes	Go to the next step.
1		No	Repair or replace any malfunctioning parts.
2	Disconnect the TCM connector. Is the resistance between the ground terminal at the TCM connector and the body ground less than 5.0 ohms?	Yes	Go to the next step.
2		No	Repair the open ground circuit.
3	Inspect the resistance between shift solenoid A and E control circuit at the TCM connector and control valve body connector. Inspect the resistance between shift solenoid A/E circuit at the TCM connector and control valve body connector. Are the resistances less than 5.0 ohms?	Yes	Go to the next step.
3		No	Repair the shift solenoid A and/or E circuit.
4	Inspect the shift solenoid. (See SOLENOID VALVE INSPECTION (PRIMARY CONTROL VALVE BODY) [FS5A-EL].) Is the solenoid valve operating properly?	Yes	Go to the next step.
4		No	Overhaul the control valve body and repair or replace any malfunctioning parts. (See ATX workshop manual [FS5A-EL].) If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual [FS5A-EL].)
5	Inspect the LPS PID value. Is the LPS PID value normal? (See TCM INSPECTION [FS5A-EL].)	Yes	Overhaul the control valve body and repair or replace any malfunctioning parts. (See ATX workshop manual [FS5A-EL].) If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual [FS5A-EL].)
5		No	Replace the TCM.
6	• 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 TCM.