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 slippage, burnt

•  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

•  APP 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.

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Inspect the value at the following PCM PID using the M-MDS. (See PCM INSPECTION[ZJ, ZY, Z6].) (See PCM INSPECTION[LF, L3].) • TSS Is the PID value normal?	Yes	Go to the next step.
1		No	Repair or replace any malfunctioning parts.
2	Disconnect the PCM connector. Is the resistance between the ground terminal at the PCM 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 control circuit at the PCM connector and control valve body connector. Inspect the resistance between shift solenoid A circuit at the PCM 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 circuit.
4	Inspect the shift solenoid. (See SOLENOID VALVE INSPECTION[FN4A-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 (FN4A-EL).) If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).)
5	Inspect the LPS PID value. Is the LPS PID value normal? (See PCM INSPECTION[ZJ, ZY, Z6].) (See PCM INSPECTION[LF, L3].)	Yes	Overhaul the control valve body and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).) If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).)
5		No	Replace the PCM.
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 PCM.