NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION [5R55S]

id0503c1801700

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 is burned

(1) Input sensor system malfunction

•  ECT sensor

•  TFT sensor

•  Sensor ground

(2) Output solenoid valve system malfunction (Sticking)

•  TCC control solenoid malfunction

(3) Main control malfunction (Poor operation, stuck)

•  TCC hydraulic pressure system

•  Improper pressures

•  Fluid pump malfunction

•  Converter malfunction

2.  Accelerator pedal position sensor malfunction (Not operating linearly)

3.  Brake switch malfunction (Always ON)

4.  TCM malfunction

Note

•  Before the following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspections are conducted.
(See BASIC INSPECTION [5R55S].)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Check the value at the following. (See PCM INSPECTION (Thailand, General (L.H.D. R.H.D.) specs.) [WL-C, WE-C].) (See PID/DATA MONITOR INSPECTION [5R55S].) PCM PIDs (using IDS/PDS): • APP • VSS TCM PIDs (using IDS/PDS): • TFT Are they normal?	Yes	Go to the next step.
1		No	Repair or replace any malfunctioning parts.
2	Disconnect the TCM connector. Is the resistance between TCM ground terminal CO and body ground, and between TCM ground terminal CL and body ground less than 5.0 ohms?	Yes	Go to the next step.
2		No	Repair the wiring harness.
3	Measure the resistance between TCM terminal A and AT connector terminal H, and between TCM terminal CK and AT connector terminal F. Are the resistances less than 5.0 ohms?	Yes	Go to the next step.
3		No	Repair the TCC control solenoid circuit. Reconnect the TCM connector.
4	Inspect the TCC control solenoid. (See SOLENOID VALVE INSPECTION [5R55S].) Are the TCC control solenoids operating properly?	Yes	Replace TCM.
4		No	Replace TCC control solenoid. If the problem remains, overhaul the transmission and repair or replace any malfunctioning parts.
5	• Verify 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 repaired, the troubleshooting is completed. • If the vehicle the not repaired or additional diagnostic information is not available, replace the TCM.