TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION [FW6A-EL]

id050315101500

TROUBLESHOOTING ITEM

Torque converter clutch (TCC) non-operation

DESCRIPTION

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

POSSIBLE CAUSE

1.  Signal malfunction

―  APP sensor malfunction

―  Brake switch malfunction

―  CKP sensor malfunction

―  ECT sensor malfunction

2.  Poor GND

3.  Torque converter malfunction

TROUBLESHOOTING ITEM	Torque converter clutch (TCC) non-operation
DESCRIPTION	• TCC does not operate when vehicle reaches TCC operation range.
POSSIBLE CAUSE	1. Signal malfunction ― APP sensor malfunction ― Brake switch malfunction ― CKP sensor malfunction ― ECT sensor malfunction 2. Poor GND 3. Torque converter malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT SIGNAL PARTS FOR MALFUNCTION • Inspect the value at the following PCM PIDs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0].) ― APP (APP sensor) ― BOO (Brake switch) ― ECT (ECT sensor) ― RPM (CKP sensor) • Is there any malfunction? (See PCM INSPECTION [SKYACTIV-G 2.0].)	Yes	Repair or replace any malfunctioning parts according to the inspection result.
1		No	Go to the next step.
2	VERIFY IF MALFUNCTION CAUSE IS TCM GND OR TORQUE CONVERTER • Switch the ignition to off. • Disconnect the TCM connector. • Visually inspect for pin deformity, open circuit, or wiring harness non-insulation between TCM terminal 1B and body GND. • Is there any malfunction?	Yes	Repair or replace any malfunctioning parts according to the inspection result.
2		No	Replace the automatic transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FW6A-EL].)