P1255

DTC P1255

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P1255
- Fuel Pump Control Module Driver High Temperature

Circuit/System Description

The engine control module (ECM) supplies voltage to the fuel pump power control module when the ECM detects that the ignition is on. The voltage from the ECM to the fuel pump power control module remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received, the fuel pump power control module supplies a varying voltage to the fuel tank fuel pump module in order to maintain the desired fuel pressure.

Conditions for Running the DTC

* The ignition voltage is greater than 9 V.

* The engine is cranking or running.

* The fuel pump enable circuit is commanded ON.

* The DTC runs continuously when the conditions above are met.

Conditions for Setting the DTC

The fuel pump power control module detects a driver temperature greater than 302°F (150°C) for less than 0.5 s.

Action Taken When the DTC Sets

DTC P1255 is a Type A DTC.

Conditions for Clearing the DTC

DTC P1255 is a Type A DTC.

Diagnostic Aids

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Sunshade - Left

Description and Operation

Fuel System Description Fuel System Description

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.

2. Verify DTC P0231, P0232, or P023F is not set.

• If any of the DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

• If none of the DTCs are set

3. Verify that the area where the fuel pump power control module is located is free of debris, clutter, or any insulating material that would cause the fuel pump power control module to overheat.

• If any debris, clutter, or other material is found

1. Clear the area where the fuel pump power control module is located.

2. Clear the DTC and test drive the vehicle.

3. Verify DTC P1255 is not set.

• If DTC P1255 is set, replace the fuel pump power control module.

• If DTC P1255 is not set

4. All OK.

• If no debris, clutter, or other material is found

4. Clear the DTC and test drive the vehicle.

5. Verify DTC P1255 is not set.

• If DTC P1255 is set
Replace the fuel pump power control module.

• If DTC P1255 is not set.

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Fuel Pump Power Control Module Replacement Fuel Pump Power Control Module Replacement