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 60 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EEC-IV (3.0L))IGNITION SYSTEMEI SYSTEM (LOW DATA RATE)TEST 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 Mercury Topaz, 1994 Mercury Sable, 1994 Ford Tempo, and 1994 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
Following test equipment is necessary to complete EI system tests.
- EI Diagnostic Cable (Rotunda 007-00044)
- Spark Tester (D89P-6666-A)
- Digital Volt-Ohmmeter (DVOM)
- Remote Starter Switch
- 2 Breakout Boxes (T83L-50-EEC-IV)
- High Voltage Spark Tester (A spark plug with a broken side electrode is not sufficient to check for spark and may lead to incorrect results.)
- Tachometer
- Tachometer Adapter (Rotunda 007-00061)
- Incandescent 12-Volt Test Light
- Inductive Type Timing Light
- EI Module Tester (007-00071, If Available)
- EI Sensor/Coil Tester (007-00072, If Available)
NOTE:
A 12-volt incandescent (high voltage) test light should not be used to test CID, IDM, PIP or SPOUT circuit signals.
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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.