Key ON-Engine Running (KOER) Test

When activated, the Key ON, Engine Running (KOER) test checks the anti-lock brake control module and system circuitry by testing its integrity and processing capability, and verifies that the various sensors and actuators are connected and operating properly. Code patterns will be indicated through the Data Link Connector (DLC) and the anti-lock brake warning indicator will indicate the type of failure.

To continue with testing, go to the Quick Tests. Quick Check/Symptom Tests