Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic procedure. |
| • | 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 | -- | -- | -- | -- |
Fuel Pump Ground | -- | ² | -- | -- |
¹Open fuel pump fuse, cranks no start ²The engine cranks but does not run 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 2 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 2 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 once 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
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
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:
- Each parameter should toggle between OK and Not Run or Not Run and OK.
| • | Fuel Pump Relay Ckt. Short Gnd Test Status |
| • | Fuel Pump Relay Ckt. Open Test Status |
| • | Fuel Pump Relay Ckt. Short Volts Test Status |
Circuit/System Testing
- Ignition OFF, disconnect the fuel pump relay.
- Ignition ON, verify that a test lamp illuminates between the ground circuit terminal 86 and B+.
- Verify that a test lamp does not illuminate between the ground circuit terminal 85 and the control circuit terminal 86.
- 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 86 and the ground circuit terminal 85. Command the fuel pump ON with a scan tool. Verify the scan tool Fuel Pump Relay Ckt. Short Gnd 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. |
Component Testing
- Measure for 70-110 ohms of resistance between terminals 85 and 86 of the fuel pump relay.
- Measure for infinite resistance between the following terminals of the fuel pump relay:
- Connect a 20A fused jumper wire from the positive terminal of the battery to relay terminal 85. Connect a jumper wire from the negative terminal of the battery to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay.
| ⇒ | If the resistance is not within the specified range, replace the fuel pump relay. |
| • | 30 and 86 |
| • | 30 and 87 |
| • | 30 and 85 |
| • | 85 and 87 |
| ⇒ | If continuity is detected, replace the fuel pump relay. |
| ⇒ | If the resistance measures more than 2 ohms, replace the fuel pump relay. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
