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.
These DTCs indicate faults are present at time of testing. A hard fault may cause CHECK ENGINE or MIL to illuminate and remain illuminated until fault is repaired. If KOER DTCs are retrieved during a KOER SELF-TEST, identify DTCs and perform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
Ensure engine is at normal operating temperature. Turn ignition switch to OFF position. Ensure test equipment is properly attached. Program NGS tester following manufacturers instructions. Follow operating instructions from NGS tester menu. Perform BPP switch, PSP switch and TCS (if applicable) cycling when instructed.