Quick Test 5.0 - Key On Engine Running (KOER)

The Key On Engine Running (KOER) Quick-Test provides hard Diagnostic Trouble Codes (DTCs) only.
Some special considerations for KOER Quick Test include the following:
- Follow the menu screen instructions as they appear.
- If a DTC appears after the KOER test, a malfunction is present.

PERFORMING KOER
- Perform visual inspection and vehicle preparation as required.
- Select "Vehicle and Engine Selection" menu.
- Select year, engine, and model with the appropriate qualifier, if needed; for example, 49-State/California.
- Select "Diagnostic Data Link" menu.
- Select " Diagnostic Test Mode" menu.
- Select "KOER On-Demand Self-Test."
- Follow operating instructions from the New Generation Star (NGS) menu screen and perform Brake Pedal Position (BPP) and cycle the Transmission Control Switch (TCS) on and off, if equipped.
- Record all DTCs displayed.
- Repair all non-transaxle DTCs first as they can directly affect the operation of the transaxle. Road test and repeat the Quick Test to verify repair.