Possible Causes

WARNING: This page is about a different car, the 2003 Mazda B4000, 2003 Mazda B3000, and 2003 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.

Possible causes are:

DTC P0230

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

DTC P0231

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).

DTC P0232 (No Start)

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.

DTC P0232 (Engine Starts)

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.