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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 73 (Automatic Transmission - Diagnosis - 4R100) >> Description & Operation >> Electronic Control System >> Key On, Engine Running (KOER) Self-Test

Key On, Engine Running (KOER) Self-Test

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2002 Lincoln Navigator, 2002 Ford Expedition, 2001 Lincoln Navigator, 2001 Ford RV Cutaway, and 2001 Ford Pickup. 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 self-test is a functional test of PCM performed with ignition key on, engine running. A check of certain input and output devices is made during operating conditions and normal operating temperature. The Brake Pedal Position (BPP) switch, Power Steering Pressure (PSP) switch and Transmission Control Switch (TCS) tests are part of KOER self-test and must be performed during this operation (if applicable). See BPP SWITCH, PSP SWITCH & 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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