Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | 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 CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Battery Voltage - Relay Switch Side | ¹ | ³ | -- | -- |
Fuel Pump Supply Voltage | ¹ | ³ | ² | -- |
Fuel Pump Relay Control | P2632 | P2632 | P2632 | -- |
Fuel Pump Relay Ground | -- | P2632 | -- | -- |
Fuel Pump Ground | -- | ³ | -- | -- |
¹Open fuel pump fuse ²Fuel pump operates continuously, then discharged battery ³Fuel pump operates will not operate | ||||
Circuit/System Description
The control module enables the fuel pump relay when the ignition switch is turned ON. The control module will disable the fuel pump relay within 2 seconds unless the control module detects ignition reference pulses. The control module continues to enable the fuel pump relay as long as ignition reference pulses are detected. The control module disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and the ignition remains ON.
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
| • | The ignition voltage is between 9-18 volts. |
| • | DTC P2632 runs continuously when the above conditions are met. |
Conditions for Setting the DTC
| • | The control module detects that the commanded state of the driver and the actual state of the control circuit do not match. |
| • | The above condition is met for a minimum of 2.5 seconds. |
Action Taken When the DTC Sets
DTCs P2632 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTCs P2632 is a Type B DTC.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
J 43244 Relay Puller Pliers
Circuit/System Verification
Important: An open or a short to voltage in the control circuit will cause both the Ckt. Open Test Status and the Ckt. Short Volts Test Status parameters to display Fault.
| • | Ignition ON, command the fuel pump relay ON and OFF with a scan tool while observing the following control circuit status parameters: |
| - | Fuel Pump Relay Ckt. Short Gnd Test Status |
| - | Fuel Pump Relay Ckt. Open Test Status |
| - | Fuel Pump Relay Ckt. Short Volts Test Status |
| • | Each parameter should toggle between OK and Not Run or Not Run and OK. |
Circuit/System Testing
- Ignition OFF, disconnect the fuel pump relay.
- Ignition ON, verify that a test lamp illuminates between the ground circuit terminal and B+.
- Verify that a test lamp does not illuminate between the ground circuit terminal and the control circuit terminal.
- Remove the test lamp.
- Command the fuel pump relay ON with a scan tool. Verify the scan tool fuel pump relay Ckt. Short Grnd Test Status parameter is OK.
- Install a 3A fused jumper wire between the fuel pump relay control circuit terminal and the ground circuit terminal. Command the fuel pump ON with a scan tool. Verify the scan tool fuel pump relay Ckt. Short Grnd Test Status parameter is Fault.
- If all circuits test normal, test or replace the fuel pump relay.
| ⇒ | If the test lamp does not illuminate, test the ground circuit for a short to voltage or an open/high resistance. |
| ⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
| ⇒ | If not the specified value, test the fuel pump relay control circuit for a short to ground. If the circuit tests normal, replace the ECM. |
| ⇒ | If not the specified value, test the fuel pump relay control circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
