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Home >> Lincoln >> 1987 >> Mark VII Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (1.9L CFI EEC IV Testing) >> Quick Test >> Key On/Engine Running (KOER) Self-Test >> Code Output

Code Output

WARNING: This page is about a different car, the 1987 Mercury Lynx, 1987 Ford Escort EXP, and 1987 Ford Escort. However, it is still accessible from the selected car via links, so may be relevant.
  1. Deactivate SELF-TEST (disconnect jumper wire). Start engine and run it at 2000 RPM for 2 minutes to warm up HEGO sensor. Turn engine off and wait 10 seconds
  2. Start engine. Insert jumper to activate SELF-TEST. The engine ID code will be displayed.
  3. If a Dynamic Response code occurs, briefly accelerate engine to wide open throttle (WOT). DO NOT  depress throttle during test unless a Dynamic Response code occurs. The KEY ON/ENGINE RUNNING (KOER) SELF-TEST  service codes will then be displayed. Observe and record all codes.
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