P0742

Diagnostic Chart:

Wiring Diagram:

Circuit Description

The PCM energizes the Torque Converter Clutch Solenoid Valve (TCC Sol. Valve) by creating a ground path on circuit 422. When grounded (energized), the TCC Sol. Valve stops converter signal oil from exhausting. This causes converter signal oil pressure to increase and move the TCC apply valve. The TCC Sol. Valve is de-energized when the PCM no longer provides a ground path. When the TCC Sol. Valve is de-energized, the valve will exhaust fluid and release the TCC.

When the PCM detects 3 occurrences of essentially no TCC slip, indicating the TCC is applied when commanded OFF, then DTC P0742 sets. DTC P0742 is a type B DTC.

Conditions for Setting the DTC

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

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

^ No TCC PWM solenoid electrical DTC P1860.

^ No TCC enable solenoid electrical DTC P0740.

^ Not in fuel shut off.

^ The engine speed is more than 500 RPM for 5 seconds.

^ The PCM has commanded the TCC OFF.

^ The commanded gear is not 1st.

^ The transmission gear range indicates 2nd, 3rd or 4th.

^ The throttle angle is 14-50%.

^ The engine torque is 95-271 N.m (7-200 lb. ft).

^ The engine speed is 800-4000 RPM.

^ The vehicle speed is 32-112 km/h (20-70 mph).

^ The last gear range change occurred more than 3 seconds ago.

^ Speed ratio is 0.58 to 1.0.

^ The TCC slip speed is -20 to +25 RPM, 3 occurrences for 5 seconds each.

Action Taken When the DTC Sets

The PCM illuminates the Malfunction Indicator Lamp (MIL).

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.

Diagnostic Aids

^ Check for PRNDL DTC P0705. This DTC affects transmission operation and may set DTC P0742.

Inspect the transmission fluid for debris.

Test Description

The number below refers to the step number on the diagnostic table.

2. A TCC slip speed, in the range shown, indicates that this DTC is current. Refer to the Diagnostic Aids. Inspect for PRNDL DTC P0705.