DTC P1220: Fuel Pump Control Module: Description

This system controls fuel pump operation. The amount of fuel flow delivered from the fuel pump is altered between 2 flow rates by the Fuel Pump Control Module (FPCM) operation. The FPCM determines the voltage supplied to the fuel pump (and therefore fuel flow).

Battery voltage is supplied to the fuel pump during the following conditions:

• During engine cranking.
• When engine coolant temperature is less than 50°F (10°C).
• When engine is running under heavy load and high speed conditions.

About 8 volts is supplied to fuel pump during all other conditions.

The FPCM adjusts the voltage supplied to the fuel pump to control the amount of fuel flow. When the FPCM increases the voltage supplied to the fuel pump, the fuel flow is increased. When the FPCM decreases the voltage, the fuel flow is decreased.