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 P0230: Fuel Pump Primary Circuit MalfunctionDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Battery Voltage - Relay Switch Side | ¹ | ² | -- | -- |
Fuel Pump Reference Voltage | ¹ | ² | ³ | -- |
Fuel Pump Relay Control | P0230 | P0230 | P0230 | -- |
Fuel Pump Relay Ground | -- | P0230 | -- | -- |
Fuel Pump Ground | -- | ² | -- | -- |
¹Open fuel pump fuse, cranks no start ²Cranks no start ³Fuel pump operates continuously, then discharged battery | ||||
Circuit/System Description
The engine control module (ECM) enables the fuel pump relay when the ignition switch is turned ON. The ECM will disable the fuel pump relay within 3 seconds unless the ECM detects ignition reference pulses. The ECM continues to enable the fuel pump relay as long as ignition reference pulses are detected. The ECM disables the fuel pump relay within 3 seconds if ignition reference pulses cease to be detected and the ignition remains ON.
The ECM monitors the voltage on the fuel pump relay control circuit. If the ECM 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 P0230 runs continuously when the above conditions are met. |
Conditions for Setting the DTC
| • | The ECM 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 P0230 is a type B DTC.
Conditions for Clearing the MIL/DTC
DTC P0230 is a type B DTC.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, engine OFF, command the fuel pump relay ON and OFF several times using the scan tool output control function. You should either hear or feel the relay click with each command.
Circuit/System Testing
- Ignition OFF, remove the affected fuel pump relay.
- Ignition ON, engine OFF, probe the control circuit of the fuel pump relay with a test lamp that is connected to a known ground. Command the fuel pump relay ON and OFF with a scan tool. The test lamp should turn ON and OFF with each command.
- Connect a test lamp between the control circuit of the fuel pump relay and the ground circuit of the fuel pump relay. Command the fuel pump relay ON and OFF with a scan tool.
| ⇒ | If the test lamp does not turn ON and OFF, test for an open/high resistance or a short to ground in the fuel pump relay control circuit or an intermittent or a poor connection at the ECM. If the circuit tests normal, replace the ECM. |
| ⇒ | If the test lamp remains illuminated with each command, test for a short to voltage in the control circuit of the fuel pump relay or an intermittent or a poor connection at the ECM. If the circuit tests normal, replace the ECM. |
| ⇒ | If the test lamp does not turn ON and OFF, repair the open/high resistance in the ground circuit of the fuel pump relay. |
| ⇒ | If the test lamp does turn ON and OFF, test for an intermittent and for a poor connection at the fuel pump relay, or a faulty fuel pump relay. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup and programming |
