P0741

DTC P0741 TORQUE CONVERTER CLUTCH SOLENOID PERFORMANCE (SHIFT SOLENOID VALVE SL)

SYSTEM DESCRIPTION

DTC Detection Condition:

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

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Based on the signals from the throttle position sensor, the airflow meter and the crankshaft position sensor, the ECM sends a signal to the shift solenoid valve SL to regulate the hydraulic pressure and provide smoother gearshifts. 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 of shift solenoid SL. The ECM will illuminate the MIL.

Step 1 - 3:

INSPECTION PROCEDURE