NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION

id050300802100

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

•  Accelerator pedal position sensor malfunction

•  TP sensor malfunction

•  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 M-MDS. (See PCM INSPECTION [ZJ, ZY].) • TSS Are PID values okay?	Yes	Go to next step.
1		No	Repair or replace any defective parts.
2	Disconnect PCM. Is resistance between GND terminal at PCM connector and body GND less than 5.0 ohms?	Yes	Go to next step.
2		No	Repair open GND 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.
3		No	Repair shift solenoid A circuit.
4	Inspect shift solenoid. (See SOLENOID VALVE INSPECTION.) Is the solenoid valve operating properly?	Yes	Go to next step.
4		No	Overhaul control valve body and repair or replace any defective parts. If problem remains, overhaul transaxle and repair or replace any defective parts.
5	Check LPS PID value. Is LPS PID value okay? (See PCM INSPECTION [ZJ, ZY].)	Yes	Overhaul control valve body and repair or replace any defective parts. If problem remains, overhaul transaxle and repair or replace any defective parts.
5		No	Replace PCM.
6	• Verify test results. ― If okay, return to diagnostic index to service any additional symptoms. ― If malfunction remains, inspect related Service informations and perform repair or diagnosis. • If vehicle not repaired, trouble shooting completed. • If vehicle not repaired or additional diagnostic information not available, replace PCM.