Possible Causes

The fuel pump driver module modulates voltage to fuel pump to achieve proper fuel pressure. Voltage for fuel pump is supplied by the power relay or FPDM power supply relay. Possible causes for DTC P0230 are:

• Open or shorted fuel pump circuit.
• Damaged fuel pump relay.
• Damaged PCM.
• Open VPWR circuit to fuel pump relay.

Possible causes for DTC P0231 are:

• Open in B+ circuit to fuel pump relay.
• Fuel pump relay contacts open.
• Open in FP PWR circuit between fuel pump relay and connection to FPM circuit.
• Damaged fuel pump relay.
• Damaged PCM (engine will start).

Possible causes for DTC P0232 (no start) are:

• Inertia Fuel Shutoff (IFS) switch not reset or electrically open.
• Open circuit between fuel pump and FPM circuit connection to FP PWR circuit.
• Poor fuel pump ground.
• Fuel pump electrically open.

Possible causes for DTC P0232 (engine starts) are:

• Fuel pump secondary circuit short to power.
• Fuel pump relay contacts always closed.
• Open in FPM circuit between PCM connection to FP PWR circuit.
• Damaged PCM.