MVA 4 Speed - Automatic Transmission

DTC P0778

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 Descriptor

This diagnostic procedure supports the following DTC:

DTC P0778 Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2)

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

The ECM detects an open or short in the shift solenoid valve SL2 circuit.

Action Taken When the DTC Sets

* DTC P0778 is a type C DTC.
* 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.