Aisin 81-40LE - Automatic Transmission

DTC P0601 or P1790

DTC Descriptors

This diagnostic procedure supports the following DTCs:

* DTC P0601 or P1790 Control Module Read Only Memory (ROM)
* DTC P1790 2nd Break Control Solenoid

Conditions for Setting the DTC

The transmission control module (TCM) detects a difference between the calculated checksum data and the rear checksum data.

Action Taken When the DTC Sets

The TCM will request the illumination of the Hold/Malfunction Indicator Lamp (MIL) and store the DTC when the TCM detects a failure on the first ignition cycle.

Conditions for Clearing the DTC

* The TCM turns off the Hold/Malfunction Indicator Lamp (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

* The harness or connector between the TCM and the engine control module (ECM)
* The ECM
* The TCM