Fuel Pump Control Module

DTC P2534 (Fuel Pump Control Module)

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 Descriptor
DTC P2534
- Ignition 1 Switch Circuit Low Voltage

Diagnostic Fault Information





Circuit/System Description

The fuel pump flow control module (FPCM) monitors the ignition voltage circuit in order to determine if the voltage is within the normal operating range.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

The FPCM detects that the IGN voltage is less than 6.0 volts.

Action Taken When the DTC Sets

DTC P2534 is a Type B DTC.

Conditions for Clearing the DTC

DTC P2534 is a Type B DTC.

Reference Information
Schematic Reference

Engine Controls Schematics (LS3) ([1][2]Electrical Diagrams)Engine Controls Schematics (LS7) ([1][2]Electrical Diagrams)Engine Controls Schematics (LS9) ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Fuel System Description (LS9) (Description and Operation)Fuel System Description (LS3 or LS7) (Description and Operation)
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 (Programming and Relearning) for scan tool information

Circuit/System Testing

1. Verify that DTC P0562 is not set.

• If DTC P0562 is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).

2. Ignition OFF, disconnect the harness connectors at the FPCM, and X2 at the FPCM relay.
3. Connect a test lamp between the appropriate IGN voltage circuit terminals listed below and ground.

* FPCM terminal 15
* FPCM relay terminal 5

4. Ignition ON, verify the test lamp turns on.

• If the test lamp is OFF, test the IGN voltage circuit a short to ground or an open/high resistance.

5. Ignition OFF, connect the harness connector at the FPCM.
6. Connect a test lamp between the X2 FPCM relay harness connector terminal 5 and ground.
7. Ignition ON, verify the test lamp is ON.

• If the test lamp is OFF, test the IGN voltage circuit an open/high resistance. If the circuit tests normal, replace the FPCM.

8. If all circuits test normal, replace the FPCM relay.

Repair Instructions

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

* Fuel Pump Flow Control Module Replacement (Fuel Pump Flow Control Module Replacement)
* Fuel Pump Flow Control Module Relay Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for FPCM replacement, setup, and programming