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HOMESERVICE MANUALSFORD1994AEROSTAR VAN WINDOW EXTENDED, 4.0 X, RWDREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSDIAGNOSIS - A4LDQUICK TESTKOEO SELF-TEST
1994 Ford Aerostar Van Window Extended, 4.0 X, RWD

KOEO Self-Test

1994 Ford Aerostar Van Window Extended, 4.0 X, RWDSECTION KOEO Self-Test

Ensure engine is at normal operating temperature. If engine does not start (or stalls after starting), continue KOEO SELF-TEST  . DO NOT  depress throttle on gasoline vehicles. Turn ignition off. Wait 10 seconds. Ensure test equipment is properly attached. Turn ignition on (engine off). Record all KOEO and Continuous Memory Codes.

If a Code 11 or 111 (pass code) is not retrieved in KOEO portion of test, service KOEO codes at this time. Service any engine codes recorded before servicing transmission codes (code Nos. 566 and 629). If PCM will not output codes, see the appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section. If service codes are retrieved observe the following procedures:

  • If CHECK ENGINE or SERVICE ENGINE SOON light is on, service codes in order retrieved.
  • On vehicles equipped with DIS and EDIS ignition systems, see the appropriate SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE section if Continuous Memory Code 211, 212, 215, 216, 217, 232 or 238 is retrieved during KOEO SELF-TEST  . Repair ignition system as necessary.
  • For 1993 models, see SYSTEM/COMPONENT TESTS - GASOLINE
  • For 1994 models, see SYSTEM/COMPONENT TESTS
  • If vehicle has a no-start condition, go to CIRCUIT TEST AA, AB or AC in the appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section.

RENDER: 1.0x

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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.