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Home >> Ford >> 2011 >> Edge Limited, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1848 (Engine Controls - Diagnostic Methods (Diesel)) >> Quick Test Description >> Key ON Engine OFF (KOEO) Self-Test

Key ON Engine OFF (KOEO) Self-Test

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

The KOEO self-test is a functional test of the PCM carried out with the ignition ON and the engine OFF. This test checks that all inputs and outputs (circuits, sensors, regulators, relays, and solenoids) connected to the PCM are electrically operating without a concern.

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