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 4 (ENGINE CONTROLS - TESTS W/CODES - EEC-IV)SELF-DIAGNOSTIC SYSTEMRETRIEVING CODES
1991 Mercury Tracer Base, 4D Sedan, Automatic
Retrieving Codes
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Retrieving Codes
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 1992 Mercury Tracer, 1992 Mercury Topaz, 1992 Mercury Sable, 1992 Mercury Grand Marquis, and 1992 Mercury Cougar. However, it is still accessible from the selected car via links, so may be relevant.
Service codes are retrieved from EEC-IV system through self-test connector. Various methods and test equipment may be used to access these codes:
- Analog Volt-Ohmmeter (VOM).
- Scan tester.
- In-Dash Malfunction Indicator Light (MIL) or CHECK ENGINE light.
SELF-TEST CONNECTOR LOCATIONS
| Application | Location |
|---|---|
| Continental & Mark VII | Right Front Fender Apron |
| Cougar & Thunderbird | In Front Of Right Shock Tower |
| Crown Victoria & Grand Marquis | Left Inner Fender, Above Wheelwell |
| Escort 1.9L & Tracer 1.9L | Right Rear Of Engine, Near Cowl |
| Town Car | Left Firewall, On Wiper Cover |
| Mustang | Left Shock Tower, Near Ignition Coil |
| Probe 3.0L | Left Rear Of Engine Compartment |
| Sable & Taurus | Right Rear Of Engine, Below Map Sensor |
| Tempo & Topaz | Right Rear Of Engine Compartment, Near Cowl |
RENDER: 1.0x
NO RELATED
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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.