P0741

CIRCUIT DESCRIPTION

The Powertrain Control Module (PCM) controls the Torque Converter Clutch Solenoid Valve (TCC Sol. Valve) pulse width modulation (PWM). The solenoid controls the hydraulic fluid for TCC apply and release. When the TCC is applied, the engine is coupled directly to the transmission through the TCC. The TCC slip speed should be near 0.

If the PCM detects high torque converter slip when the TCC is commanded ON, then DTC P0741 sets. DTC P0741 is a Type B DTC.

CONDITIONS FOR SETTING THE DTC

^ No MAF DTCs P0101, P0102, or P0103 are set.
^ No Throttle Position (TP) sensor DTCs P0121, P0122, or P0123 are set.
^ No Vehicle Speed (VSS) sensor DTCs P0502, or P0503 are set. No Automatic Transmission Input Speed (A/T ISS) sensor DTCs P0716, or P0717 are set.
^ No TCC Stuck ON DTC P0742 is set.
^ No Automatic Transmission Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) DTC P1810 is set.
^ No TCC PWM Sol. Valve DTC P1860 is set.
^ The engine has been running for more than 5 seconds.
^ The TFP Val. Position Sw. indicates D4.
^ The TCC Sol. Valve is commanded ON at maximum duty cycle.
^ The throttle angle is greater than 8°.
^ Not in fuel shut off
^ The transmission gear ratio indicates 2nd, 3rd, or 4th gear.
^ The transmission fluid temperature is -18-130°C (0-266°F).
^ Delivered torque is between 43-202 Nm (32-150 lb ft).
^ The TCC slip must not exceed torque limits.

ACTION TAKEN WHEN THE DTC SETS

^ The PCM illuminates the Malfunction Indicator Lamp (MIL) after two consecutive trips with a failure reported.
^ SERVICE ENGINE SOON, SERVICE TRANSMISSION displays on the Driver Information Center (DIC).
^ The PCM inhibits Torque Converter Clutch.
^ The PCM inhibits 4th gear if the transmission is in hot mode.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The PCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.
^ A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.
^ The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM.

DIAGNOSTIC AIDS

^ Inspect the transmission fluid level.
^ The transmission may be in hot mode. Inspect the transmission fluid lines to the radiator. The lines may be pinched, plugged or twisted.

TEST DESCRIPTION

The numbers below refer to the step numbers on the diagnostic table.

2. This step inspects the transmission fluid to ensure that it is at the proper level.
5. This step verifies that the TCC engages when commanded ON by the scan tool.