Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 5 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EEC-IV)IGNITION SYSTEMEI SYSTEM (LOW DATA RATE) (MUSTANG 2.3L)TEST EQUIPMENT
1991 Mercury Tracer Base, 4D Sedan, Automatic
Test Equipment
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Test Equipment
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 1993 Mercury Tracer, 1993 Mercury Topaz, 1993 Mercury Sable, 1993 Mercury Grand Marquis, and 1993 Mercury Cougar. However, it is still accessible from the selected car via links, so may be relevant.
Following test equipment is necessary to complete ICM ignition system tests.
- EI (Low Data Rate) Diagnostic Cable (007-00044)
- Spark Tester (D81P-6666-A & D89P-6666-A)
- Digital Volt-Ohmmeter (DVOM)
- Remote Starter Switch
- 2 EEC-IV Breakout Boxes (T83L-50-EEC-IV)
- EEC-IV Breakout Box 2.3L Overlay
- ICM Adapter Tachometer (007-00061)
- Inductive Type Timing Light (DO NOT use advance knob, if equipped, as it will not work correctly with EI ignition systems.)
- 12-Volt Test Light (Incandescent Type)
- Test Light (LED Type) Or Logic Probe (LED Type)
- ICM Tester (007-00071)
- ICM Coil/Sensor Tester (007-00072)
NOTE:
A 12-volt incandescent test light should not be used to test CID, IDM, PIP or SPOUT circuit signals. It will load circuit and may cause incorrect measurements or faulty ICM/PCM operation.
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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.