NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION [AW6A-EL, AW6AX-EL]

NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION [AW6A-EL, AW6AX-EL]SM2445409

NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION [AW6A-EL, AW6AX-EL]

id050310802100

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 piston 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. ― TCC slippage, burnt • Line pressure low • Incorrect accelerator opening signal • VSS malfunction • Input/turbine speed sensor malfunction • Sensor GND malfunction • TCC control solenoid malfunction • Coupler component malfunction • Control valve body malfunction ― Torque converter malfunction ― Centrifugal hydraulic pressure clutch is not operating properly

Diagnostic procedure

STEP	INSPECTION		ACTION
1	• Disconnect the TCM. • Is the resistance between the TCM ground terminal A9 and the body GND less than 5.0 ohms?	Yes	Go to the next step.
1		No	Repair open ground circuit.
2	• Inspect the TCC control solenoid. (See SOLENOID VALVE INSPECTION [AW6A-EL, AW6AX-EL].) • Is the TCC control solenoid normal?	Yes	Go to the next step.
2		No	Inspect the coupler component. If normal, replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [AW6A-EL, AW6AX-EL].)
3	• Perform the stall test. (See MECHANICAL SYSTEM TEST [AW6A-EL, AW6AX-EL].) • Is the stall speed below specified value?	Yes	Inspect the ATF condition. • If large amount of metal specks are found, overhaul the transaxle and repair or replace any malfunctioning parts. (See Automatic Transaxle and Transfer Workshop Manual AW6A-EL AW6AX-EL.) • If a large amount of metal specks are not found, replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [AW6A-EL, AW6AX-EL].)
3		No	Replace the torque converter. (See TORQUE CONVERTER REMOVAL/INSTALLATION [AW6A-EL, AW6AX-EL].)
4	• Verify test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If malfunction remains, inspect the related Service Information and perform repair or diagnosis. • If the vehicle is repaired, troubleshooting completed. • If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.