System Description

WARNING: This page is about a different variant/trim than selected.

The ECM uses signals from the throttle position sensor, air-flow meter, turbine (input) speed sensor, intermediate (counter gear) speed sensor and crankshaft position sensor to help determine the engagement timing of the lock-up clutch. The ECM monitors the engagement of the clutch using the turbine (input) speed sensor, intermediate (counter gear) speed sensor and crankshaft position sensor.

Then the ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM memory to detect shift solenoid valve SL, valve body and torque converter clutch mechanical problems.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P0740-7F	Torque Converter Clutch Actuator Stuck Off	Both conditions are met (2-trip detection logic): Lock-up does not occur when requested. No. 3 ATF pressure switch is on.	Shift solenoid valve SL remains closed Transmission wire Valve body is blocked Torque converter assembly Automatic transaxle (clutch, brake or gear etc.) Line pressure is too low	Comes on	DTC stored	SAE: P0741