Integrated Control Relay Module: Locations

On the 4.6L (4V) Mustang, a normally closed Low Speed Fuel Pump relay is wired into the Power-to-Pump circuit. With the Low Speed Fuel Pump relay contacts in the normally closed position, full B+ is sent to the pump for high speed operation. For low speed fuel pump operation, the PCM will ground the Low Fuel Pump (LFP) circuit, which opens the relay contacts. With the relay contacts open, power to the fuel pump must now pass through a resistor that is wired into the circuit.

Engine View:

The Constant Control Relay Module is mounted on bracket, behind engine coolant reservoir. This model also has a seperate Fuel Pump Relay. Fuel Pump Relay