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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 72 (Diagnosis) >> Description & Operation >> Electronic Control System >> Key On, Engine Running (KOER) Self-Test

Key On, Engine Running (KOER) Self-Test

WARNING: This page is about a different car, the 2001 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: PCM will not perform KOER self-test if any KOEO DTCs are present and not repaired.

KOER on-demand self-test is a functional test of PCM performed with ignition key on, engine running. A check of certain inputs and outputs is made during operating conditions and normal operating temperature. The Brake Pedal Position (BPP) switch, Transmission Control Switch (TCS) and Power Steering Pressure (PSP) switch tests are part of KOER on-demand self-test and must be performed during this operation (if applicable). See BPP, PSP & TCS TEST PROCEDURES  . A fault must be present at time of testing for KOER on-demand self-test to detect a fault.

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