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HOMESERVICE MANUALSFORD1987TEMPO GL, 4D SEDAN, 2.3 X, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM2.3L HSC/CFI TESTINGQUICK TESTKEY ON/ENGINE OFF (KOEO) SELF-TESTNOTES
1987 Ford Tempo GL, 4D Sedan, 2.3 X, Automatic

Key On/Engine Off (KOEO) Self-Test: Notes

1987 Ford Tempo GL, 4D Sedan, 2.3 X, AutomaticSECTION Notes
NOTE: Continuous memory codes recorded in this step will be used for diagnosis in CONTINUOUS SELF-TEST test procedures.

Correct test results for system are dependent on the correct operation of several related non-EEC components and systems. It may be necessary to correct faults in these areas before EEC-IV will pass QUICK TEST  .

Verify that vehicle has been properly prepared. See PREPARATION  and EQUIPMENT HOOK-UP  . Turn ignition on to start SELF-TEST. DO NOT depress throttle during test. Observe and record all service codes.

  1. If engine does not start, go to TEST A - NO START  , step 1). If KEY ON/ENGINE OFF (KOEO) code and continuous memory indicate a pass (code 11), go to TIMING CHECK  .
  2. If any KOEO code is displayed with continuous memory code 11, KOEO SELF-TEST indicates a fault. Record codes and go to TEST RESULTS & ACTION TO TAKE in this test.
  3. If any (KOEO) or any continuous memory code is displayed, (KOEO) SELF-TEST and continuous memory indicate a fault. Record codes, but DO NOT repair continuous memory codes at this time. All (KOEO) and KEY ON/ENGINE RUNNING (KOER) SELF-TEST codes MUST be repaired first. Go to TEST RESULTS & ACTION TO TAKE in this test.
  4. If (KOEO) code 11 displayed with ANY continuous memory code (except 15), continuous memory indicates a fault. Record codes, but DO NOT repair continuous memory codes at this time. (KOEO) and (KOER) SELF-TEST codes MUST be repaired first. Go to TIMING CHECK  . If engine idles rough, go to DIAGNOSIS BY SYMPTOM TEST  .
  5. If (KOEO) code 11 is displayed and continuous memory code is 15, go to TEST PP - NO CODES/CODES NOT LISTED  , step 9). If no codes are displayed, repeat SELF-TEST to verify that no service codes are present. If codes are not displayed, go to TEST PP - NO CODES/CODES NOT LISTED  , step 1).

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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.