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

id050301802100

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.  TCC piston slipped, burnt

•  Line pressure high

•  Shift solenoid A malfunction

•  Pressure control solenoid malfunction

•  Control valve body malfunction

•  Body GND malfunction

2.  Signal malfunction

•  APP sensor malfunction

•  Input/turbine speed sensor malfunction

•  ABS wheel-speed sensor malfunction

•  TFT sensor malfunction

•  Sensor GND 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. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [PCM (FN4A-EL)].) (See BASIC INSPECTION [FN4A-EL].)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Inspect the TSS PID value using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [PCM (FN4A-EL)].) Is the PID value normal?	Yes	Go to the next step.
1		No	Repair or replace any malfunctioning parts.
2	Disconnect the PCM connector. Measure the resistance between ground terminal at the PCM connector and body ground. Is the resistance less than 5.0 ohms?	Yes	Go to the next step.
2		No	Repair or replace the wiring harness for a possible open circuit.
3	Measure the resistance between shift solenoid A control circuit at PCM connector and control valve body connector. Measure the resistance between shift solenoid A circuit at PCM connector and control valve body connector. Are the resistances less than 5.0 ohms?	Yes	Go to the next step.
3		No	Repair or replace the shift solenoid A control 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. If any problem remains: • Overhaul the transaxle and repair or replace any malfunctioning parts.
5	Inspect the LPS PID value using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [PCM (FN4A-EL)].) Is the PID value normal?	Yes	Overhaul the control valve body and repair or replace any malfunctioning parts. If any problem remains: • Overhaul the transaxle and repair or replace any malfunctioning parts.
5		No	Replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 1.6].)
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. (See PCM REMOVAL/INSTALLATION [MZR 1.6].)