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HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 29 (ENGINE CONTROLS - TESTS W/CODES - EEC 2.5L)CIRCUIT TESTSTEST EQUIPMENT
1991 Mercury Tracer Base, 4D Sedan, Automatic

Test Equipment

1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Test Equipment
WARNING: This page is about a different car, the 1994 Ford Probe. However, it is still accessible from the selected car via links, so may be relevant.

Following equipment is recommended for testing EEC system. 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 (007-00057 or T92C -6000) is required to perform certain 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. Complete EEC system wiring diagrams may be found in WIRING DIAGRAMS .
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.