P0742

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. When the TCC Sol. Valve is de-energized, the valve will exhaust fluid and release the TCC.

When the PCM detects 3 occurrences of TCC slip between -20 and +50 RPM for 5 seconds, 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 TP DTCs P0122 or P0123.
- No VSS DTCs P0502 or P0503.
- No Torque Converter Clutch Pulse Width Modulation (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 indicates 2nd, 3rd or 4th.
- The throttle angle is between 14-50%.
- The engine torque is 95-271 N.m (70-200 lb. ft).
- The TCC slip speed is -20 to +50 RPM, for 3 occurrences of greater than 5 seconds.
- The engine speed is 800-4,000 RPM.
- The vehicle speed is 32-112 km/h (2070 mph).
- The speed ratio is 0.65-1.18.
- The last gear range change occurred more than 3 seconds ago.

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. DTC P0705 affects transmission operation. This may set DTC P0742 falsely.
- 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.