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, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALGAUGESINSTRUMENT PANEL - ELECTRONICTESTINGDIAGNOSTIC TESTINGTEST C
1988 Ford Aerostar Van Passenger, Automatic
Test C
1988 Ford Aerostar Van Passenger, AutomaticSECTION Test C
- Turn ignition to "RUN" position and observe display. If all display segments light normally, and then display returns to normal operation, go to next step.
- Ensure "ENGLISH/METRIC switch is in English released position. Depress and hold "GAUGE SELECT" switch in, while turning ignition to "RUN" position. Verify that display shows all zeros and note number of bar segments lit on tachometer display. Release "GAUGE SELECT" switch.
- If 24 bar segments were lit on tachometer display, replace tach/multigauge module and recheck cluster operation. If module does not respond when "GAUGE SELECT" switch is depressed, go to Test T. If normal display was shown (8 bar segments lit on tachometer and one bar lit on multigauge), go to next step.
- Ensure "ENGLISH/METRIC switch is in English (released) position. Depress and hold "GAUGE SELECT" switch in, while turning ignition to "RUN" position. Advance to display portion of test by pushing "GAUGE SELECT" switch until Test display appears, 8 segments and a number 69. See Fig 1 .
- Continue advancing through each step of Test Display by depressing "GAUGE SELECT" button. Verify that the displays match the following. See Fig 2 . If all Test Display Patterns are correct, system is okay. If display areas are incorrect, replace tach/multigauge module 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.