NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION [FS5A-EL]

id050308801700

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

•  VSS

•  Input/turbine 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 operating linear)

3.  Input/turbine speed sensor or VSS malfunction

4.  Brake switch malfunction (Always ON)

5.  ECT sensor malfunction

Note

•  Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FS5A-EL].) (See BASIC INSPECTION [FS5A-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 RANGE” or “NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATE IN P, R, N POSITION AND D RANGE”. (See NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M RANGE [FS5A-EL].) (See NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATES IN P, R, N POSITION AND D RANGE [FS5A-EL].)
2	Inspect the following PCM and TCM PID values using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [MZR 2.0, MZR 2.5].) (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FS5A-EL].) PCM PID: • APP TCM PIDs: • THOP • OSS • TSS Are the PID values normal? (See PCM INSPECTION [MZR 2.0, MZR 2.5].)	Yes	Go to the next step.
2		No	Repair or replace any malfunctioning parts.
3	Disconnect the TCM connector. Measure the resistance between ground terminal at the TCM 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 the TCM connector and control valve body connector. Is the resistance 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 [FS5A-EL].) Are the shift solenoids operating properly?	Yes	Replace the TCM. (See TCM REMOVAL/INSTALLATION [FS5A-EL].)
5		No	Overhaul the control valve body and repair or replace any malfunctioning parts. (See ATX workshop manual [FS5A-EL].) If any problem remains: • Overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual [FS5A-EL].)
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 TCM. (See TCM REMOVAL/INSTALLATION [FS5A-EL].)