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NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION [FN4A-EL]

id0503a1802100

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 slipped, burned • Line pressure high • Shift solenoid A malfunction • Control valve body malfunction • Body GND malfunction • Pressure control solenoid malfunction 2. Signal malfunction • Vehicle speed sensor malfunction • Sensor GND malfunction • TFT sensor malfunction • TP sensor malfunction or mis-adjustment • Input/turbine speed sensor malfunction 3. Torque converter malfunction Note • Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Check the value at the following PIDs using the WDS or equivalent. (See PCM INSPECTION [WITHOUT WU-TWC].) (See PCM INSPECTION [WITH WU-TWC].) - TSS • Are PID values normal? | Yes | Go to next step.
No | Repair or replace any defective parts.
2 | • Disconnect PCM. • Is resistance between ground terminal at PCM connector and body ground less than 5.0 ohms? | Yes | Go to next step.
No | Repair open ground circuit.
3 | • Check resistance between shift solenoid A control circuit at PCM connector and control valve body connector. • Check resistance between shift solenoid A circuit at PCM connector and control valve body connector. • Are the resistance less than 5.0 ohms? | Yes | Go to next step.
No | Repair shift solenoid A circuit.
4 | • Inspect Shift solenoid. (See SOLENOID VALVE INSPECTION [FN4A-EL].) Is the solenoid valve operating properly? | Yes | Go to next step.
No | Overhaul control valve body and repair or replace any defective parts. (See ATX workshop manual (FN4A-EL) [1623-10-98E].) If problem remains, overhaul transaxle and repair or replace any defective parts. (See ATX workshop manual (FN4A-EL) [1623-10-98E].)
5 | • Check LPS PID value. (See PCM INSPECTION [WITHOUT WU-TWC].) (See PCM INSPECTION [WITH WU-TWC].) • Is LPS PID value normal? | Yes | Overhaul control valve body and repair or replace any defective parts. (See ATX workshop manual (FN4A-EL) [1623-10-98E].) If problem remains, overhaul transaxle and repair or replace any defective parts. (See ATX workshop manual (FN4A-EL) [1623-10-98E].)
No | Replace PCM.
6 | • Verify test results. - If normal, return to diagnostic index to service any additional symptoms. - If malfunction remains, inspect related Service Information and perform repair or diagnosis. • If vehicle repaired, troubleshooting completed. • If vehicle not repaired or additional diagnostic information not available, replace PCM.