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 B
1988 Ford Aerostar Van Passenger, Standard
Test B
1988 Ford Aerostar Van Passenger, StandardSECTION Test B
- Turn ignition to "RUN" position. If display is backlit but blank, check for proper operation of speedo/odometer. If speedo/odometer operates properly, go to step 2). If not operating properly, go to step 5).
- Disconnect negative battery cable. Remove EIC, and prevent connector from shorting. Reconnect negative battery cable. Turn ignition to "RUN" position.
- Using a voltmeter, check voltage at circuit 489 (Pin 1C). See Figure . If greater than 10 volts, go to step 4). If less than 10 volts, check circuit 489 for open between cluster pin 1C and splice.
- Using an ohmmeter, check for continuity between circuit 397 (Pin 2C) and negative battery cable. If continuity is present, replace tach/multigauge module and recheck cluster operation. If no continuity exists, check for open in cluster ground circuit 397 (Pin 2C).
- Check for bad fuse in circuit 489, If fuse is bad, go to step 6) before replacing fuse. If fuse is okay, go to step 2).
- Before replacing fuse, turn ignition off and disconnect negative battery cable. Connect ohmmeter between circuit 489 and fuse ground. If continuity is present, replace fuse and recheck cluster operation. If continuity is not present, correct short in circuit 489. Replace fuse and recheck cluster operation.
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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.