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Home >> Ford >> 1988 >> Bronco II 4WD, Standard, M5OD-R1 >> Repair and Diagnosis >> Engine Performance >> System >> EEC-IV CEC System >> Quick Test >> Key On Engine Running (KOER) Self-Test >> KOER Test Results

KOER Test Results

  1. If no codes are displayed, repeat SELF-TEST to verify that no service codes are present, and then go to TEST D14  , step 1). If a code 98 appears in the Engine ID segment, with any other code, go back and perform KEY ON/ENGINE OFF (KOEO) SELF-TEST  and obtain a code 11 for KOEO portion of QUICK TEST. The code 98 indicates the vehicle DID NOT pass the KOEO test.
  2. If Engine ID code is 2, 3 or 4 (20, 30 or 40 with STAR tester), and code 11 is displayed, KOER SELF-TEST portion is okay. If symptom was an intermittent, go to CONTINUOUS MONITOR SELF-TEST  . If symptom is present, go to DIAGNOSIS BY SYMPTOM TEST  .
  3. If Engine ID code is 2, 3 or 4 (20, 30 or 40 with STAR tester), and any code other than 11 appears, KOER SELF-TEST indicates a fault. Perform the test indicated in the KEY ON ENGINE RUNNING (KOER) - TEST MENU  table for that specific engine.
  4. Start with the first code displayed. If the tests refer you to other checks, perform them as instructed. When more than one code is displayed, repair problems in the order that codes are displayed. Whenever a repair is made, repeat QUICK TEST  .
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