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 MANUALSFORD1988AEROSTAR VAN PASSENGER, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALGAUGESINSTRUMENT PANEL - ELECTRONICTESTINGDIAGNOSTIC TESTINGTEST E
1988 Ford Aerostar Van Passenger, Standard
Test E
1988 Ford Aerostar Van Passenger, StandardSECTION Test E
- Ensure engine is operating properly and is not misfiring. Disconnect negative battery cable, and remove EIC. Using an ohmmeter, measure resistance between pin 4C (circuit 11) and ignition coil. See Figure . Move coil wiring side-to-side to check for intermittent connection.
- If resistance is less than 100 ohms, replace tach/multigauge module and recheck cluster operation. If resistance is greater than 100 ohms, check wiring for open in circuit 11 (pin 4C).
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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.