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 Relay Control CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Battery Voltage - Relay Switch Side | ¹ | ² | -- | -- |
Fuel Pump Supply Voltage | ¹ | ² | ³ | -- |
Fuel Pump Relay Control | P0230 | P0230 | P0230 | -- |
Fuel Pump Relay Ground | -- | P0230 | -- | -- |
Fuel Pump Ground | -- | ² | -- | -- |
¹Blown fuel pump fuse, cranks no start ²Cranks no start ³Fuel pump operates continuously, then discharged battery | ||||
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 is ON. |
| • | The system voltage is between 9-18 volts. |
| • | DTC P0230 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
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
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
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.
Ignition ON, command the fuel pump relay ON and OFF with a scan tool output 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 and scan tool disconnected for 90 seconds, remove the fuel pump relay using J 43244 Pliers .
- Test for less than 5 ohms of resistance between the ground circuit and ground.
- Connect a test lamp between the control circuit and the ground circuit of the fuel pump relay.
- Command the fuel pump relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If all circuits test normal, test or replace the fuel pump relay.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the engine control module (ECM). |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. |
Component Testing
- Ignition OFF, disconnect the fuel pump relay.
- Test for 70-110 ohms of resistance between terminals 85 and 86.
- Test for infinite resistance between the following terminals:
- Install a 20A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms of resistance between terminals 30 and 87.
| ⇒ | If not within the specified range, replace the relay. |
| • | 30 and 86 |
| • | 30 and 87 |
| • | 30 and 85 |
| • | 85 and 87 |
| ⇒ | If not the specified value, replace the relay. |
| ⇒ | If greater than the specified range, replace the relay. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming
