NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION [5R55S]

id0503c1802100

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

•  TCC control solenoid malfunction

•  Control valve body malfunction

•  Body ground malfunction

2.  Signal malfunction

•  Sensor ground malfunction

3.  Torque converter malfunction

Note

•  Before the following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspections are conducted.
(See BASIC INSPECTION [5R55S].)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Disconnect TCM. Is the resistance between TCM ground terminal CO and body ground, and between TCM ground terminal CL and body ground less than 5.0 ohms?	Yes	Go to the next step.
1		No	Repair the wiring harness.
2	Measure the resistance between the following TCM and AT connector terminals. • TCM terminal A and AT connector terminal F • TCM terminal CK and AT connector terminal H Is the resistance less than 5.0 ohms?	Yes	Go to the next step.
2		No	Repair the TCC control solenoid circuit.
3	Inspect the TCC control solenoid. (See SOLENOID VALVE INSPECTION [5R55S].) Is the solenoid valve operating properly?	Yes	Go to the next step.
3		No	Replace TCC control solenoid. If the problem remains, overhaul the transmission and repair or replace any malfunctioning parts.
4	Inspect the PCA, PCB and PCC PID values. (See PID/DATA MONITOR INSPECTION [5R55S].) Are the PCA, PCB and PCC PID values normal?	Yes	Clean and inspect main control, if parts are damaged replace main control. If the problem remains, overhaul the transmission and repair or replace any malfunctioning parts.
4		No	Replace the TCM.
5	• Verify 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 repaired, the troubleshooting is completed. • If the vehicle the not repaired or additional diagnostic information is not available, replace the TCM.