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 57 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EEC (1.8L))COMPUTERIZED ENGINE CONTROLSPOWERTRAIN CONTROL MODULE (PCM)
1991 Mercury Tracer Base, 4D Sedan, Automatic
Powertrain Control Module (Pcm)
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Powertrain Control Module (Pcm)
WARNING: This page is about a different car, the 1994 Mercury Tracer and 1994 Ford Escort. However, it is still accessible from the selected car via links, so may be relevant.
To check PCM ground and power circuits, refer to CIRCUIT TEST PGC in TESTS W/CODES - EEC 1.8L article in the ENGINE PERFORMANCE section.
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.