P0742

DTC P0742 TCC (Torque Converter Clutch) Circuit Stuck ON

Circuit Description
Shifting between individual gears takes place by means of overlapping clutch engagement and release.
If two clutches are engaged or released at the same time during shifting, the transaxle or engine could be damaged.
To prevent this damage, TCM monitors the clutch pressure at the shifting point.
Once shifting begins, TCM begins the monitoring after the regular time and inspects the turbine revolution speed. If the revolution speed is not within the specified value, the fault occurs and TCM memorize it.

Conditions for Setting the DTC
- Vehicle shift solenoid fault does not occur.
- Throttle is more than 25%.
- Transmission oil temperature is more than -10°C (14°F).
- System voltage is more than 9 volts.
- No input speed error DTCs P0715, P0716 and P0717.
- No engine speed error DTCs P0725, P0726 and P0727.
- Engine speed is more than 1200 rpm.
- Input speed is more than 1200 rpm and 3500 rpm.
- Engine is running.
- Selector lever is not in N(Neutral), P (Park) position.
- TCC lock-up status is commanded OFF.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
- Open lock up clutch.

Conditions for Clearing the MIL/DTC
- The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- Using a scan tool can clear history DTCs.

Diagnostic Aids

Steps 1-2:

Steps 4 (continued)-6:

- Inspect the poor wiring harness connection for TCM connectors and transaxle wiring connectors.
- Inspect the improperly formed or damaged terminals.