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, the 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 • APP 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.
No | Perform the symptom troubleshooting “NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN D OR M RANGE”, or “NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATE IN P, R AND N POSITION”. (See NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN D OR M RANGE [SJ6A-EL].) (See NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATE IN P, R AND N POSITION [SJ6A-EL].)
2 | • Disconnect the TCM connector. (See TCM REMOVAL/INSTALLATION [SJ6A-EL].) • Measure the resistance between the TCM ground terminal 1P, 1X and the body GND. • Is the resistance less than 5.0 ohms? | Yes | Go to the next step.
No | Repair or replace the suspected wiring harness.
3 | • Access the following PCM PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) ― RPM ― APP ― TP ― ECT • Are the PIDs value normal? (See PCM INSPECTION [L8, LF].) | Yes | Go to the next step.
No | Repair or replace the malfunctioning part according to the inspection results.
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.
No | Replace the TFT sensor. (See TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR REMOVAL/INSTALLATION [SJ6A-EL].)
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.
No | Replace the control valve body. (See CONTROL VALVE BODY REMOVAL [SJ6A-EL].) (See CONTROL VALVE BODY INSTALLATION [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 a large amount of metal specks are found, overhaul the transmission and repair or replace any malfunctioning parts. (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION [SJ6A-EL].) (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].)
No | Replace the torque converter. (See TORQUE CONVERTER REMOVAL/INSTALLATION [SJ6A-EL].)
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. (See TCM REMOVAL/INSTALLATION [SJ6A-EL].)