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HOMESERVICE MANUALSFORD1988AEROSTAR VAN PASSENGER, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMEEC-IV CEC SYSTEMQUICK TESTTEST D11 - "CHECK ENGINE" LIGHT/MESSAGE-MALFUNCTION INDICATOR
1988 Ford Aerostar Van Passenger, Automatic

Test D11 - "Check Engine" Light/Message-Malfunction Indicator

1988 Ford Aerostar Van Passenger, AutomaticSECTION Test D11 - "Check Engine" Light/Message-Malfunction Indicator

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: fuses, bulb, or socket. This circuit test checks STO-MIL circuit and ECA.

Fig 1: "CHECK ENGINE" Light (Malfunction Indicator) Circuit
G72376
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.