Diagnostic Aids

WARNING: This page is about a different variant/trim than selected.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:

Fuel Pump Relay
Inertia Fuel Shutoff (IFS) Switch
Wiring Harness Circuits (B+, FP, FPM, FP PWR, GND, LFP & VPWR)
Powertrain Control Module (PCM)

Fig 1: Identifying Fuel System Circuits (Blackwood, Crown Victoria, Econoline, Escape, Expedition, Grand Marquis, Navigator & Pickup - Except F150 Lightning 5.4L SC)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying Fuel System Circuits & Connector Terminals (Explorer, Explorer Sport, Explorer Sport Trac, Mountaineer, Ranger & Windstar)

Courtesy of FORD MOTOR CO.

Fig 3: Identifying Fuel System Circuits & Connector Terminals (Excursion & Town Car)

Courtesy of FORD MOTOR CO.

Fig 4: Identifying Fuel System Circuits & Connector Terminals (Pickup - F150 Lightning 5.4L SC)

Courtesy of FORD MOTOR CO.

Fig 5: Identifying Inertia Fuel Shutoff Switch Terminals

Courtesy of FORD MOTOR CO.

NOTE: On F150 Lightning 5.4L SC, Inertia Fuel Shutoff (IFS) switch relay may also be referred to as crash fuel shutoff relay.