P1744 FORD, LINCOLN, MAZDA, MERCURY: TORQUE CONVERTER CLUTCH SYSTEM STUCK IN OFF POSITION
POST UPDATED IN May, 2023
P1744 FORD, LINCOLN, MAZDA, MERCURY: TORQUE CONVERTER CLUTCH SYSTEM STUCK IN OFF POSITION
A TCC solenoid (Torque Converter Clutch) valve is energized while in D4 by the TCM (Transmission Control Module) in response to signals provided from the vehicle speed and the ECM (Engine Control Module). This controls the operation of the lock-up piston.
When the TCC solenoid valve is activated, the torque converter lock-up clutch is activated accordingly, and a 1 to 1 RPM ratio is created between the transmission input shaft and the torque converter rotational speed. However, the lock-up operation is disabled when the transmission fluid temperature is too low. When the accelerator pedal is depressed (below 2/8) in lockup condition, the engine speed should not have abrupt changes, otherwise, there is no lockup.
DTC P1744 OBDII is set on Ford, Lincoln, Mazda, and Mercury vehicles due to the ECM encountering excessive slipping conditions from the transmission or when the TCC solenoid is not functioning.
P1744 OBD2 diagnostic code is set for one of the following reasons:
To solve the P1744 OBDII fault code you should take into account the following: