Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

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

Wiring Harness Circuits (B+, GND & VPWR To Fuel Pump Relay; FP, FPM, FP PWR, FP RTN & FPDM PWR). See Fig 1-Fig 5 .
Faulty Inertia Fuel Shutoff (IFS) Switch
Faulty Fuel Pump Driver Module (FPDM)
Faulty Power Supply Relay Inside Constant Control Relay Module (CCRM)
Faulty Powertrain Control Module (PCM)

Fig 1: Identifying Fuel Pump Driver Module Circuits & Connector Terminals (Aviator)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying Fuel Pump Driver Module Circuits & Connector Terminals (Focus, Crown Victoria, Grand Marquis, Sable, Taurus & Town Car)

Courtesy of FORD MOTOR CO.

Fig 3: Identifying Fuel Pump Driver Module Circuits & Connector Terminals (Mustang)

Courtesy of FORD MOTOR CO.

Fig 4: Identifying Fuel Pump Driver Module Circuits & Connector Terminals (ZX2)

Courtesy of FORD MOTOR CO.

Fig 5: Identifying Fuel Pump & Rear Electronics Module Circuits & Connector Terminals (LS & Thunderbird)

Courtesy of FORD MOTOR CO.