P0741

DTC P0741 Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve SL)

DESCRIPTION
The ECM uses the signals from the throttle position sensor, air flow meter, turbine (input) speed sensor, intermediate (counter) shaft speed sensor and crankshaft position sensor to monitor the engagement condition of the lock-up clutch.

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

P0741:

MONITOR DESCRIPTION
Based on the signals from the throttle position sensor, air flow meter and crankshaft position sensor, the ECM sends a signal to the shift solenoid valve SL to regulate the hydraulic pressure and provide smoother gear shifts. The shift solenoid valve SL responds to commands from the ECM. The valve controls the lock-up relay valve to perform torque-converter lock-up and flexible lock-up functions.

The ECM compares the engine rpm (NE) signal and the input turbine speed signal to detect torque converter lock-up. The ECM then compares the lock-up status against the lock-up schedule in the ECM memory. If the ECM does not detect lock-up at the appropriate time, it will conclude that there is a malfunction in shift solenoid valve SL. The ECM will illuminate the MIL.

MONITOR STRATEGY

MONITOR STRATEGY:

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS (PART 1):

TYPICAL ENABLING CONDITIONS (PART 2):

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS: