General Information

Engine Control
P0685 ECM/PCM Power Relay Control Circuit /Open - General Information

Component Location





General Description

The PCM controls the ground path of the main relay control coil. The other side of the main relay coil is connected to fuse B+ (Battery Voltage).

DTC Description

The PCM checks the main relay control circuit every 10 seconds. If the PCM detects an open or short in the control circuit it will set a DTC P0685.

DTC Detecting Condition





** If Main relay has a fault (ex. when the engine is running),
the DTC's, P0638/P0685/P1295/P2106, can set at the same time.

- P0638 Throttle Actuator Control Range/Performance(Bank 1)
- P0685 ECM/ECM Power Relay Control Circuit /Open
- P1295 Throttle Actuator Control System - Power Management
- P2106 Throttle Actuator Control System - Forced Limited Power

Specification

Diagnostic Circuit Diagram