The engine control module (ECM) provides ignition voltage to the coil side of the fuel pump relay whenever the engine is cranking or running. The control module enables the fuel pump relay as long as the engine is cranking or running, and ignition system reference pulses are received. If no ignition system reference pulses are received, the control module turns OFF the fuel pump. The fuel pump relay control circuit is equipped with a feedback circuit that is pulled up to 2.5 volts within the ECM. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage.

The ECM detects the fuel pump relay control circuit is open, shorted to ground, or shorted to a voltage for greater than 4 seconds.

DTC P0230 is a Type C DTC.

DTC P0230 is a Type C DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

DTC Type Reference

Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Engine Control Module Scan Tool Information

1. Ignition ON, command the Fuel Pump Relay ON and OFF with a scan tool. You should hear an audible click.
2. Attempt to start the engine. Observe the DTC information with a scan tool. DTC P0230 should not set.
3. 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.

1. Ignition OFF, disconnect the fuel pump relay.
2. Test for less than 5 ohms between the relay coil ground circuit terminal 85 and ground.

⇒	If greater than the specified range, repair the relay coil ground circuit for an open/high resistance.

3. Connect a test lamp between the control circuit terminal 86 and ground.
4. Ignition ON. The test lamp should turn ON for approximately 3 seconds and then OFF. Repeat as necessary in order to verify test lamp operation.

⇒	If the test lamp remains OFF all the time, test the control circuit for a short to ground or an open/high resistance. If circuit/connections test normal, replace the ECM.

⇒	If the test lamp remains ON all the time, test the control circuit for a short to voltage. If circuit/connections test normal, replace the ECM.

5. If all circuits/connections test normal, test or replace the fuel pump relay.

1. Test for 70-110 ohms between terminals 85 and 86 of the fuel pump relay.

⇒	If not within the specified range, replace the fuel pump relay.

2. Test for infinite resistance between the following terminals of 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.

3. 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. Test for less than 2 ohms between terminals 30 and 87 of the relay.

⇒	If greater than the specified range, replace the fuel pump relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.