NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION [JA5AX-EL]


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 fail-safe is operating. Verify DTC at first. If TCC operates when driving at high speeds only, the malfunction (improper adjustment) is in D and/or M ranges switch circuit or TR switch circuit. Note • If the TCC or piston is stuck, inspect them. In addition, inspect the oil cooler for foreign particles which may have mixed in with the ATF. • TCC piston slipped, burned - Line pressure low • Incorrect throttle position signal • Input/turbine speed sensor malfunction • TFT sensor malfunction • Sensor ground malfunction • VSS malfunction • Malfunction of output solenoid valve system (Sticking) • TCC solenoid valve malfunction • Malfunction of control valve body system (Poor operation, sticking) • TCC piston hydraulic pressure system malfunction • Malfunction of TP sensor (Not operating linearly) • Malfunction of input/turbine speed sensor or VSS Note • Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted.


STEP	INSPECTION		ACTION
1	• Turn ignition switch to ON. • Does gear position lamp indication correspond to selector lever position?	Yes	Go to next step.
1		No	Go to symptom troubleshooting 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 TCM. • Is resistance between ground terminals 1C, 1Y at TCM connector and body ground less than 5.0 ohm?	Yes	Go to next step.
2		No	Repair open ground circuit.
3	• Remove torque converter. • Inspect torque converter. (See ATX Workshop Manual.) • Is torque converter okay?	Yes	• Overhaul control valve body and repair or replace any defective parts. (See ATX Workshop Manual.) • If problem remains, replace or overhaul transaxle and repair or replace any defective parts. (See ATX Workshop Manual.)
3		No	• Replace torque converter.
4	• Verify test results. - If okay, return to diagnostic index to service any additional symptoms. - If malfunction remains, inspect related Service Informations and perform repair or diagnosis. • If vehicle repaired, troubleshooting completed. • If vehicle not repaired or additional diagnostic information not available, replace TCM.

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