P2632

DTC P2632

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 P2632
- Fuel Pump Relay 2 Control Circuit

Diagnostic Fault Information






Circuit/System Description

The fuel pump is located on the left frame rail between the fuel tanks. The engine control module (ECM) provides ignition positive voltage to the coil side of the fuel pump relay. The ECM energizes the fuel pump relay, which applies power to the fuel transfer pump. Fuel is transferred from the rear fuel tank to the front fuel tank in order to ensure all of the usable fuel volume is available to the engine.

The control module monitors the voltage on the fuel pump relay control circuit. If the control module detects an incorrect voltage on the fuel pump relay control circuit, a fuel pump relay control DTC sets.

Conditions for Running the DTC

Ignition is ON.

Conditions for Setting the DTC

* The ECM detects an incorrect voltage on the control circuit of the fuel pump relay.
* The above condition exists for 1 second.

Action Taken When the DTC Sets

DTC P2632 is Type C DTC.

Conditions for Clearing the DTC

DTC P2632 is Type C DTC.

Circuit/System Verification

1. Turn ON the ignition, with the engine OFF.
2. The fuel pump relay should click when the fuel pump is commanded ON and OFF with a scan tool.
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Turn OFF the ignition.
2. Remove the fuel pump relay and turn ON the ignition, with the engine OFF.
3. Connect a test lamp between the control circuit of the fuel pump relay and ground.
4. Command the fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF with each command.

• If the test lamp remains illuminated, test the fuel pump relay control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
• If the test lamp does not turn ON and OFF with each command, test the fuel pump relay control circuit for a short to ground or an open. If the circuits test normal, replace the ECM.

5. Connect a test lamp between the control circuit of the fuel pump relay and the ground circuit of the relay.
6. Command the fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF with each command.

• If the test lamp does not turn ON and OFF with each command, test the fuel pump relay ground circuit for an open or high resistance.
• If the test lamp turns ON and OFF with each command, replace the fuel pump relay.

Repair Instructions

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

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