Pinpoint Test F : DTC P0657: Notes

Refer to Transmission Controls - MPS6 for schematic and connector information.

Normal Operation and Fault Conditions 

The transmission solenoid power control relay controls vehicle power to all solenoids. Power is routed through the transmission solenoid power control relay (inside the PCM) to all transmission solenoids. If the power circuit to the transmission solenoids or the transmission solenoid power control relay fails open, all solenoids are failed electrically off. Check for open, short to ground or the transmission connector disconnected. The transmission solenoid power control relay disables power to the transmission solenoids when certain transmission Diagnostic Trouble Codes (DTCs) are set.

DTC Fault Trigger Conditions 

Possible Sources 

• Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
• Transmission internal wiring harness frame
• PCM