Test Equipment

Following equipment is recommended for performing EEC system circuit tests. DO NOT attempt to test this system without proper equipment. Damage to vehicle components may result if improper equipment is used.

Digital Volt-Ohmmeter (DVOM) with minimum 10-megohm input impedance.
A breakout box and breakout box adapter (T92C-6000-AH) is required to perform tests on system. Test pin number mentioned in circuit tests refers to test pin number on breakout box. Breakout box Adapter (T92C-6000-AH) has an A/B position selector switch. Ensure switch is in correct position for each test step. If no switch position is given, switch can be in either position. Once breakout box has been installed during a test sequence, it may stay connected for remainder of that test, unless stated otherwise. Aftermarket breakout boxes are also available.
Vacuum gauge with 0-30 in. Hg range and resolution (units on scale) of 1 in. Hg.
Tachometer with 0-6000 RPM range, +/- 40 RPM accuracy, and a resolution of 20 RPM.
Vacuum pump with 0-30 in. Hg range.
Timing light.
Spark Tester (D81P-6666-A or ST-125) is required. A modified side electrode spark plug is not sufficient for these procedures.
Fuel Injection Pressure Gauge (T80L-9974-A).
12-volt test light (non-powered type).
Jumper wire about 15" long.

NOTE: Following circuit tests and illustrations are provided courtesy of Ford Motor Co. For complete EEC system wiring diagrams, see the WIRING DIAGRAMS - 2.5L article in the ENGINE PERFORMANCE section.