P0657

DTC P0657

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptor
DTC P0657
- Solenoid Control High Circuit Group 1

Circuit/System Description

The PCM performs continuous self checks of all internal circuits. The PCM provides ignition positive voltage to the throttle actuator control (TAC) motor on circuit 1. DTC P0657 sets when the powertrain control module (PCM) has determined that the control module has an internal fault in the ignition voltage supply circuit 1.

Conditions for Running the DTC

* The ignition is ON.
* DTC P0657 runs continuously once the above condition is met.

Conditions for Setting the DTC

DTC P0657 sets when the internal voltage of the TAC motor ignition supply circuit is incorrect.

Action Taken When the DTC Sets

DTC P0657 is a type A DTC.

Conditions for Clearing the DTC

DTC P0657 is a type A DTC.

Diagnostic Aids

Inspect the PCM for water contamination. Water entering the PCM can cause damage and corrosion to the circuit boards and to internal components. Repair the source of the water entry before the installation of a replacement PCM.

A DTC P0657 can set if an incorrect PCM is installed in the vehicle. Install the correct PCM according to the vehicle and/or the engine type and equipment options.

Reference Information
Schematic Reference

Engine Controls Schematics (Electrical Diagrams)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

Ignition ON, observe the DTC information with a scan tool. Verify DTC P0657 does not set this ignition cycle.

If DTC P0657 is set, replace the PCM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning) for control module replacement, setup, and programming