P0974

DTC P0973 or P0974

Circuit Description

Shifting from 1st to 4th (O/D) is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1 and SL2 which is controlled by the engine control module (ECM). If an open or short circuit occurs in either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly (fail safe function). The ECM will illuminate the MIL and store the DTC.

DTC Descriptors

This diagnostic procedure supports the following DTC:

* DTC P0973 Shift Solenoid "A" Control Circuit Low (Shift Solenoid Valve S1)
* DTC P0974 Shift Solenoid "A" Control Circuit High (Shift Solenoid Valve S1)

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

P0973

The ECM detects short in solenoid valve S1 circuit two times when valve is operated.

P0974
* The ECM detects an open in solenoid valve S1 circuit two times when solenoid valve in not operated.
* The ECM detects an open or short in the shift solenoid valve SL2 circuit.

Action Taken When the DTC Sets

* DTC P0973 and P0974 are type C DTCs.
* The malfunction indicator lamp (MIL) illuminates the first time the diagnostic runs with the fault active.

Conditions for Clearing the MIL/DTC

The DTC will clear when conditions for setting the DTC have been repaired.