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Home >> Mercury >> 1988 >> Tracer 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> MPFI System >> Quick Test >> Key On/Engine Off (KOEO) Self-Test

Key On/Engine Off (KOEO) Self-Test

NOTE: DO NOT  depress throttle during KOEO self-test.

This is a test of electronic engine control system, conducted with power (voltage) applied and engine not running. Activate self test and record all codes displayed. Erase codes and repeat self-test. Diagnose only codes that occur during repeat self-test. After codes have been noted, proceed to KOEO & ENGINE RUNNING SELF-TEST CHART.

Fig 1: KOEO & Engine Running Self-Test Chart
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