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 42 (ENGINE CONTROLS - TESTS W/CODES - EEC-V (4.6L))ADDITIONAL SYSTEM FUNCTIONSNON-GENERIC OBD II PARAMETER IDENTIFICATION (PID)
1991 Mercury Tracer Base, 4D Sedan, Automatic
Non-Generic OBD II Parameter Identification (PID)
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Non-Generic OBD II Parameter Identification (PID)
WARNING: This page is about a different car, the 1994 Mercury Cougar and 1994 Ford Thunderbird. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tester using the following steps:
- Select vehicle and engine selection menu. See Figure .
- Select year, engine, model and any additional information requested by scan tester.
- Select GENERIC OBD II OPTIONS. Press CONT button if monitors are not complete.
- Select DIAGNOSTIC DATA LINK.
- Select PCM - POWERTRAIN CTRL MODULE.
- Select DIAGNOSTIC TEST MODES.
- Select PID DATA MONITOR AND RECORD.
- Turn ignition on or start engine and allow to idle.
- Follow operating instructions from scan tester menu.
- Select PIDs and press START.
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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.