P025A

DTC P025A

Diagnostic Instructions

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

DTC Descriptor

DTC P025A
- Fuel Pump Flow Control Module Enable Circuit

Diagnostic Fault Information






Circuit/System Description

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

Conditions for Running the DTC

* The ignition is ON.
* Battery voltage is greater than 11.5 volts.

Conditions for Setting the DTC

The FPCM detects low or no voltage on the fuel control enable signal circuit.

Action Taken When the DTC Sets

DTC P025A is an A type DTC.

Conditions for Clearing the DTC

DTC P025A is an A type DTC.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the FPCM.
2. Ignition OFF, install a test lamp between the control circuit terminal 13 and ground.
3. Ignition ON, verify that a test lamp illuminates for 2 seconds.

^ If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

4. If all circuits test normal, replace the FPCM.

Repair Instructions

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