Key On Engine Running (KOER) Self-Test

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 manufacturer's instructions. Follow operating instructions from NGS tester menu. Perform BPP switch, PSP switch and TCS (if applicable) cycling when instructed.