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HOMESERVICE MANUALSFORD1993PICKUP F250, 2D PICKUP, 5.0 N, STANDARD, M5OD-R2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 5 (ENGINE CONTROLS - TESTS W/CODES - EEC-IV)QUICK TESTKOEO SELF-TEST
1993 Ford Pickup F250, 2D Pickup, 5.0 N, Standard, M5OD-R2

KOEO Self-Test

1993 Ford Pickup F250, 2D Pickup, 5.0 N, Standard, M5OD-R2SECTION KOEO Self-Test
WARNING: This page is about a different car, the 1994 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.

Ensure engine is at normal operating temperature. If engine does not start (or stalls after starting), continue KOEO SELF-TEST.

Perform the following step(s) as applicable:

  • On gasoline vehicles, DO NOT  depress throttle.
  • On vehicles with Brake On/Off circuit, apply and release brake pedal after vehicle ID code is given.
  • On vehicles with Power Steering Pressure (PSP) switch, turn steering wheel 1/2 turn and release after vehicle ID code is given.
  • On vehicles with Transmission Control Switch (TCS), cycle TCS switch after vehicle ID code is given.

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, service KOEO codes. See SERVICE CODE REFERENCE CHARTS. If PCM will not output codes, go to CIRCUIT TEST QA. If service codes are retrieved:

  • Service codes in order retrieved. See SERVICE CODE REFERENCE CHARTS.
  • If vehicle has a no-start condition, see CIRCUIT TEST AA.
  • If vehicle displays a Code 11 or 111 (pass code), go to KOER SELF-TEST.
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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.