P0741

CIRCUIT DESCRIPTION

The Torque Converter Clutch Solenoid Valve (TCC Sol. Valve) is a pulse width modulated solenoid. When vehicle operating conditions are appropriate for TCC application, the Powertrain Control Module (PCM) begins the TCC duty cycle at approximately 42%. The PCM then increases the duty cycle up to 90%, in order to achieve full TCC apply pressure. When the TCC Sol. Valve is de-energized, the solenoid blocks filtered 2-3 drive fluid, and allows TCC signal fluid to exhaust. When energized, the solenoid modulates fluid into the TCC signal fluid circuit. When fully energized, modulation stops, and the solenoid blocks both 2-3 drive fluid and TCC signal fluid exhaust.

When the PCM detects a high TCC slip speed when the TCC is commanded ON, then DTC P0741 sets. DTC P0741 is a type B DTC.


CONDITIONS FOR SETTING THE DTC

^ No Throttle Position (TP) DTCs P0121, P0122 or P0123.

^ No Vehicle Speed Sensor (VSS) DTCs P0502 or P0503.

^ No TCC Stuck ON DTC P0742.

^ No Transaxle Fluid Pressure (TFP) Val. Position Sw. DTC P1810.

^ No TCC Release DTC P1887.

^ The time since the gear select lever change is greater than 6 seconds.

^ The Transaxle Fluid Pressure (TFP) Val. Position Sw. indicates 2, 3 or D.

^ The PCM commands the TCC ON for greater than 3 seconds.

^ The TP is greater than 8%.

^ The transmission fluid temperature (TFT) is 20-130°C (68-266°F).

^ The commanded gear is 2nd, 3rd, or D.

^ The TCC slip speed is greater than 250 RPM for 8 seconds, two consecutive times.


ACTION TAKEN WHEN THE DTC SETS

^ The PCM illuminates the Malfunction Indicator Lamp (MIL).

^ The PCM inhibits TCC engagement.

^ The PCM freezes shift adapts from being updated.

^ DTC P0741 is stored in the PCM history.


CONDITIONS FOR CLEARING THE MIL/DTC

^ The PCM turns OFF the MIL after three consecutive trips 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.

3. This step verifies that the TCC engages when commanded On by the scan tool.