NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION [SJ6A-EL]

id050307801700

12

Torque converter clutch (TCC) non-operation

DESCRIPTION

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

POSSIBLE CAUSE

•  Basically, TCC does not operate when the fail-safe is operating. Verify the DTC at first. If the TCC operates when driving at high speeds only, the malfunction (improper adjustment) is in the M range switch circuit or TR switch circuit.

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.

•  TCC slippage, burnt

―  Line pressure low

•  Incorrect throttle position signal

•  Incorrect accelerator pedal position signal

•  Incorrect engine speed signal

•  Incorrect engine coolant temperature signal

•  Incorrect engine torque signal

•  Turbine sensor malfunction

•  VSS malfunction

•  Output solenoid valve system malfunction (Sticking)

•  TCC control solenoid malfunction

•  Control valve body system malfunction (Poor operation, sticking)

•  TCC hydraulic pressure system malfunction

•  Accelerator pedal position sensor malfunction (Not operating linearly)

•  Turbine sensor or VSS malfunction

•  Operation of fail-safe function.

―  Short to power or GND at TCC control solenoid related circuit.

Note

•  Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION [SJ6A-EL].)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	• With the ignition switch at the ON position. • Does the gear position indicator light indication correspond to the selector lever position?	Yes	Go to the next step.
1		No	Go to No.27 “GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M RANGE”, or No.28 “GEAR POSITION INDICATOR LIGHT ILLUMINATES IN D RANGE OR P, N, R POSITIONS”.
2	• Disconnect the TCM. • Is the resistance between the TCM ground terminal 1P, 1X and the body GND less than 5.0 ohms?	Yes	Go to the next step.
2		No	Repair open ground circuit.
3	• Access the following PCM PIDs using the M-MDS. ― RPM ― APP ― TP ― ECT • Are PIDs value normal?	Yes	Go to the next step.
3		No	Inspect and repair suspected PID related part.
4	• Inspect the TFT sensor. (See TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR INSPECTION [SJ6A-EL].) • Is the TFT sensor normal?	Yes	Go to the next step.
4		No	Replace the TFT sensor.
5	• Inspect the TCC control solenoid. (See SOLENOID VALVE INSPECTION [SJ6A-EL].) • Is the line pressure control solenoid normal?	Yes	Go to the next step.
5		No	Replace suspected solenoid. (See Automatic Transmission Workshop Manual SJ6A-EL.)
6	• Remove the torque converter. (See TORQUE CONVERTER REMOVAL/INSTALLATION [SJ6A-EL].) • Inspect the torque converter. • Is the torque converter normal?	Yes	Inspect the ATF condition. • If large amount of metal specks are found, overhaul the transaxle and repair or replace any malfunctioning parts. (See Automatic Transmission Workshop Manual SJ6A-EL.) • If a large amount of metal specks are not found, replace the control valve body. (See CONTROL VALVE BODY REMOVAL [SJ6A-EL].) (See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)
6		No	Replace the torque converter.
7	• Verify test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If malfunction remains, inspect the related Service Information and perform repair or diagnosis. • If the vehicle is repaired, troubleshooting completed. • If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.