P0230

Circuit Description

The PCM provides ignition positive voltage to control the fuel pump relay. The PCM has the ability to detect an electrical malfunction on the relay control circuit. When the ignition switch is first turned on, the PCM energizes the fuel pump relay which applies power to the fuel pump. The fuel pump relay will remain on as long as the engine is running or cranking and the PCM is receiving reference pulses. If no reference pulses are present, the PCM de-energizes the fuel pump relay within 2 seconds after the ignition is turned on or the engine is stopped. With the engine stopped, the fuel pump can be turned on by using the scan tool output controls function. If an electrical malfunction is detected, the PCM will set DTC P0230.

Conditions for Running the DTC

^ The ignition is on.
^ System voltage is between 9.0 and 18.0 volts.

Conditions for Setting the DTC

^ The PCM detects an electrical malfunction on the fuel pump relay control circuit.
^ The condition is present for 0.5 second.

Action Taken When the DTC Sets

^ The PCM will illuminate the MIL during the second consecutive trip in which the diagnostic has been run and failed.
^ If equipped with traction control, the PCM will command the Electronic Brake and Traction Control Module (EBTCM) via the serial data circuit to turn OFF traction control, and the EBTCM will illuminate the TRACTION OFF lamp.
^ The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data.

Conditions for Clearing the MIL/DTC

^ The PCM will turn the MIL OFF during the third consecutive trip in which the diagnostic has been run and passed.
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.

Diagnostic Aids

Check for the following conditions:

Important: Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.

^ Poor terminal connection.
Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Use a corresponding mating terminal to test for proper tension. Refer to Diagrams.
^ Damaged harness.
Inspect the wiring harness for damage. If the harness appears to be OK, observe the sensor display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the sensor display may indicate the location of the fault.
^ Inspect the PCM and the engine grounds for clean and secure connections.

If the DTC is determined to be intermittent, reviewing the Fail Records can be useful in determining when the DTC was last set.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table:

2. Listen for an audible click when the relay operates. Command both the on and off states. Repeat the commands as necessary.
3. Verifies that the PCM is providing voltage to the relay.
4. Tests for an open in the ground circuit to the relay.
5. Tests if voltage is constantly being applied to the relay.
12. The PCM utilizes Electrically Erasable Programmable Read only Memory (EEPROM). When the PCM is replaced, the new PCM must be programmed.