Test Notes

Signal Functions
The Fuel Pump Control (FPC) is the control circuit from the PCM used to energize the fuel pump relay. At key on, the relay is energized for 20 seconds, and all the time when rpm is detected. The Fuel Pump Monitor (FPM) circuit is downstream of the inertia switch and is used by the PCM to monitor voltage going to the fuel pump.

DTC Descriptions
P0230 = Fuel pump relay driver circuit fall
P0231 = Fuel pump relay driver failed ON - was not detected on the FPM circuit when the fuel pump was commanded ON
P0232 = Fuel pump relay driver failed OFF - voltage was detected on the FPM circuit when fuel pump was commanded OFF