Fuel Pump Control Module (M45 & Q45)
When ignition is turned on and engine is cranking or running, fuel pump relay is activated. Battery voltage is directed from the fuel pump relay to Fuel Pump Control Module (FPCM) and fuel pump. The FPCM adjusts the voltage supplied to fuel pump according to engine conditions. FPCM supplies battery voltage to the fuel pump under the following conditions:
- During engine cranking.
- When engine coolant temperature is less than 50°F (10°C).
- Engine is running under heavy load and high speed conditions.