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Home >> Ford >> 1983 >> Ranger 2.0 C >> Repair and Diagnosis >> Engine Performance >> System >> 2.8L EEC IV Testing >> Testing & Diagnosis >> Quick Tests >> Key On/Engine Off (KOEO) Test
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Key On/Engine Off (KOEO) Test

Turn ignition switch on. Reconnect grounded jumper wire to self-test input terminal. Observe and record On Demand and Continuous codes. When more than 1 code is displayed, always repair problems in the order that codes were displayed. DO NOT  depress throttle during test. Repair codes as follows: