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 MANUALSFORD1987AEROSTAR VAN WINDOW, 2.3 A, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALGAUGESINSTRUMENT PANEL - ELECTRONICTESTINGDIAGNOSTIC TESTINGTEST H
1987 Ford Aerostar Van Window, 2.3 A, Automatic
Test H
1987 Ford Aerostar Van Window, 2.3 A, AutomaticSECTION Test H
- Disconnect negative battery cable. Remove EIC and prevent connections from shorting. Using an ohmmeter, measure resistance between pins 13C and 14C. See Figure . If resistance is 14-163 ohms, replace tach/multigauge module and recheck cluster operation. If resistance is not between 14 and 163 ohms, go to next step.
- Disconnect negative battery cable. Lower fuel tank to gain access to fuel sending unit connector. Unplug fuel sending unit connector. Measure resistance between pins 13C and 14C. If resistance is not 14-163 ohms, replace tach/multigauge module and recheck cluster operation. If resistance is higher than 163 ohms, go to next step.
- Disconnect negative battery cable. Lower fuel tank to gain access to fuel sending unit connector. Unplug fuel sending unit connector. Measure resistance between pins 13C and 14C of cluster. If resistance is greater than 10,000 ohms, replace fuel sending unit and recheck cluster operation. If resistance is less than 10,000 ohms, correct short in harness.
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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.