P0741

Diagnostic Chart:

Wiring Diagram:

Circuit Description

The Torque Converter Clutch Solenoid Valve (TCC Sol. Valve) is a pulse width modulated solenoid. The Powertrain Control Module (PCM) energizes the TCC Sol. Valve by grounding circuit 418. When vehicle operating conditions are appropriate for TCC application, the PCM begins the TCC duty cycle at approximately 68%. The PCM then increases the duty cycle up to 93%, 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) Sensor DTCs P0121, P0122, or P0123.

^ No Automatic Transmission Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) DTC P1810.

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

^ No TCC Stuck ON DTC P0742.

^ No TCC release DTC P1887.

^ Time since the last manual gear select lever change is greater than 3 seconds.

^ The TFP Val. Position Sw. indicates 2, 3, or D.

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

^ The TP is 10-75%.

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

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

^ The TCC slip speed is 300 RPM, or greater, for 5 seconds, two consecutive times.

Action Taken When the DTC Sets

^ The PCM does illuminates the Malfunction Indicator Lamp (MIL) after two consecutive trips with a failure reported.

^ DTC P0741 is stored in the PCM history.

^ The PCM inhibits TCC engagement.

^ The PCM freezes shift adapts from being updated.

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 wiring for poor electrical connections at the PCM. Inspect the wiring for poor electrical connections at the transmission 20-way connector. Look for the following conditions:

- A bent terminal

- A backed out terminal

- A damaged terminal

- Poor terminal tension

- A chafed wire

- A broken wire inside the insulation

^ When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change.

Test Description

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

2. DTCs P0719, P0753, and P0758 also set if the power circuit is open.

7. This Step verifies the PCM's ability to command the TCC Sol. Valve.

9. This Step tests for correct component, and circuit, resistance.