Diagnostic Aids

WARNING: This page is about a different car, the 2002 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.

Perform this test only when directed here by QUICK TEST or SYMPTOM DIAGNOSIS. This test is intended to diagnose the following:

Fuel supply system.
Engine vacuum.
Fuel pressure.
Fuel filter.
Fuel return.
Fuel supply.
Fuel injectors.

NOTE: See SYMPTOM DIRECTORY table for proper diagnostic step.

SYMPTOM DIRECTORY

Symptom	Go To Step
Fuel System Pressure Test	1)
No Fuel Pressure	3)
Low Fuel Pressure	20)
High Fuel Pressure	30)
Fuel Injector Test	40)

INERTIA FUEL SHUTOFF SWITCH TESTING

Switch Condition	Resistance
Open (Tripped)	More Than 10 k/ohms
Closed (Set)	Less Than 5 Ohms

Fig 1: Identifying Fuel Pump Assembly Connector Terminals

Courtesy of FORD MOTOR CO.

Fig 2: Identifying Left Side Engine Compartment Relay Block

Courtesy of FORD MOTOR CO.

Fig 3: Identifying Fuel Pump Relay Terminals

Courtesy of FORD MOTOR CO.

Fig 4: Identifying Inertia Fuel Shutoff Switch Harness Connector Terminals

Courtesy of FORD MOTOR CO.