P0230
DTC P0230
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* 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 Circuit
Diagnostic Fault Information
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 DTCs.
Conditions for Clearing the MIL/DTC
DTC P0230 is a Type B DTCs.
Circuit/System Verification
Ignition ON, command the fuel pump relay ON and OFF with a scan tool. Listen/feel for relay to click.
Circuit/System Testing
1. Ignition OFF, remove the fuel pump relay from the underhood electrical center.
2. Connect a test lamp between the control circuit and a good ground.
3. Command the fuel pump relay ON and OFF with a scan tool. The test lamp should turn ON and OFF with each command.
• If the test lamp is always OFF, test the control circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. 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.
• If the test lamp is always 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.
Component Testing
1. Measure for 70-110 ohms of resistance between terminals 85 and 86 of the fuel pump relay.
• If the resistance is not within the specified range, replace the fuel pump relay.
2. Measure 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 15-amp 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 than2 ohmsbetween terminals 30 and 87 of the 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. Verification Tests
* Refer to Programming and Relearning for ECM setup and programming. Programming and Relearning
* Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center)