Aisin 81-40LE - Automatic Transmission (European Emissions)

DTC P0742 (European Emissions)

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0742 Torque Converter Clutch (TCC) System - Stuck On

Conditions for Setting the DTC

* Lockup solenoid is stuck ON
* Drive (D) range is selected
* Engine water is normal temperature
* 20 seconds have passed since the transaxle was placed in Drive (D)
* Engine revolution is 600 RPM or greater
* No failure of input speed sensor, engine revolution, water temperature signal, solenoid electrical, ranger sensor, throttle signal

Action Taken When the DTC Sets

The transmission control module (TCM) will request the illumination of the malfunction indicator lamp (MIL) and store the DTC when the TCM detects failures on 2 consecutive ignition cycles.

Conditions for Clearing the DTC

* The TCM turns off the MIL when no further failures are detected on the next ignition cycles.
* The scan tool can clear the DTC from the TCM history.
* The TCM clears the DTC from the TCM history memory after 40 consecutive ignition cycles without fault.

Cause of Failure

* Lockup solenoid
* Inside automatic transmission (A/T)
* Inside valve body
* TCM