NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION [FN4A-EL]

id050301801700

12

Torque converter clutch (TCC) non-operation

DESCRIPTION

•  TCC does not operate when vehicle reaches TCC operation range.

POSSIBLE CAUSE

•  Basically, the TCC does not operate when the fail-safe is operating. Verify the DTC first.

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 burnt

(1) Input sensor system malfunction

•  Input/turbine speed sensor

•  ABS wheel-speed sensor

•  TFT sensor

•  Sensor GND

(2) Output solenoid valve system malfunction (Sticking)

•  Shift solenoid A malfunction

•  Shift solenoid E malfunction

(3) Control valve body malfunction system (Poor operation, stuck)

•  TCC hydraulic pressure system

2.  APP sensor malfunction (Not operation liner)

3.  Input/turbine speed sensor or ABS wheel-speed sensor malfunction

4.  Brake switch malfunction (Always ON)

5.  ECT sensor 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	Does the gear position indicator light indication correspond to the selector lever position with the ignition at the ON?	Yes	Go to the next step.
1		No	Perform the symptom troubleshooting “NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M POSITION” or “NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATES IN P, R, N AND D POSITION”. (See NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M POSITION [FN4A-EL].) (See NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATES IN P, R, N AND D POSITION [FN4A-EL].)
2	Inspect the following PID values using the M-MDS: (See PCM INSPECTION [MZR 1.6].) (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [PCM (FN4A-EL)].) • APP • TSS • VSS Are the PID values normal?	Yes	Go to the next step.
2		No	Repair or replace any malfunctioning parts.
3	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.
3		No	Repair or replace the wiring harness for a possible open circuit.
4	Measure the resistance between shift solenoid A and E control circuit at PCM connector and control valve body connector. Are the resistances less than 5.0 ohms?	Yes	Go to the next step.
4		No	Repair or replace the shift solenoid A or E control circuit.
5	Inspect the shift solenoid A and E. (See SOLENOID VALVE INSPECTION [FN4A-EL].) Are the shift solenoids operating properly?	Yes	Replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 1.6].)
5		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.
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].)