NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION [AY6A-EL, AY6AX-EL]

id0503k3801700

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 position 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 accelerator opening signal • Input/turbine speed 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) • Input/turbine speed sensor or VSS malfunction • Brake switch malfunction (always ON) • CKP sensor malfunction • CHT sensor malfunction • Operation of fail-safe function. ― Short to power or ground at TCC control solenoid related circuit. Note • Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See BASIC INSPECTION [AY6A-EL, AY6AX-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 | Go to No.27 “GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN D OR M POSITION”, or No.28 “GEAR POSITION INDICATOR LIGHT ILLUMINATE IN P, R OR N POSITION”.
2 | • Disconnect the TCM. • Is the resistance between the TCM ground terminal A9 and the body ground less than 5.0 ohms? | Yes | Go to the next step.
No | Repair open ground circuit.
3 | • Perform the PID/DATA Monitor Record Procedure and access following PCM and TCM PIDs while the vehicle is in TCC operation condition. (See PCM INSPECTION [MZI-3.7].) (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [AY6A-EL, AY6AX-EL].) PCM PIDs: ― APP1 ― APP2 ― BOO ― CHT TCM PIDs: ― TCCC ― THOP ― TSS ― OSS • Are they normal? | Yes | Go to the next step.
No | Repair or replace malfunctioning part according to inspection result.
4 | • Inspect the TCC solenoid. (See TORQUE CONVERTER CLUTCH (TCC) CONTROL SOLENOID INSPECTION [AY6A-EL, AY6AX-EL].) • Is the TCC solenoid normal? | Yes | Go to the next step.
No | Inspect the coupler component. If normal, replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].)
5 | • Perform the stall test. (See MECHANICAL SYSTEM TEST [AY6A-EL, AY6AX-EL].) • Is the stall speed within the specified? | Yes | Inspect the ATF condition. If large amount of metal specks are found, replace the transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].) If a large amount of metal specks are not found, replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].)
No | Replace the torque converter. (See TORQUE CONVERTER REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].)
6 | • Verify test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If malfunction remains, inspect the related Service Bulletins and/or On-line Repair 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.