Powertrain Management
DTC P2632
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 P2632
- Fuel Pump Relay 2 Control Circuit
Diagnostic Fault Information
Circuit/System Description
The control module enables the secondary fuel pump relay when the ignition switch is turned ON. The control module will disable the secondary fuel pump relay within 2 seconds unless the control module detects ignition reference pulses. The control module continues to enable the secondary fuel pump relay as long as ignition reference pulses are detected. The control module disables the secondary fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and the ignition remains ON.
Conditions for Running the DTC
* The ignition voltage is between 11-32 volts.
* DTC P2632 runs continuously when the above condition is 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
DTC P2632 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P2632 is a Type B DTC.
Reference Information
Schematic Reference
Engine Controls Schematics (except L96) [1][2]Electrical DiagramsEngine Controls Schematics (L96) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
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
Special Tools
J-43244 - Relay Puller Pliers
Circuit/System Verification
Note: 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.
1. Ignition ON, command the Fuel Pump 2 Relay ON and OFF with a scan tool while observing the following control circuit status parameters:
* Fuel Pump 2 Relay Ckt. Short Gnd Test Status
* Fuel Pump 2 Relay Ckt. Open Test Status
* Fuel Pump 2 Relay Ckt. Short Volts Test Status
Each parameter should toggle between OK and Not Run or Not Run and OK.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the secondary fuel pump relay.
2. Ignition ON, verify that a test lamp illuminates between the ground circuit terminal 85 and B+.
• If the test lamp does not illuminate, test the ground circuit for a short to voltage or an open/high resistance.
3. Verify that a test lamp does not illuminate between the ground circuit terminal 85 and the control circuit terminal 86.
• If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Remove the test lamp.
5. Command the Fuel Pump 2 Relay ON with a scan tool. Verify the scan tool Fuel Pump Relay 2 Ckt. Short Gnd Test Status parameter is OK.
• If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
6. Install a 3 A fused jumper wire between the secondary fuel pump relay control circuit terminal 86 and the ground circuit terminal 85. Command the fuel pump ON with a scan tool. Verify the scan tool Fuel Pump 2 Relay Ckt. Short Gnd Test Status parameter is Fault.
• If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
7. If all circuits test normal, test or replace the secondary fuel pump relay.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)
* Control Module References Control Module References for ECM replacement, setup and programming