Quick Test 3.0 - Key on, Engine Off (KOEO)

CAUTION: Do not replace parts based on a code, perform Pinpoint Tests first.

- The key on engine off (KOEO) test provides "hard" diagnostic trouble codes (DTCs) present at the time of testing.
- Always service the "hard" DTCs first.

Performing KOEO
- Perform visual inspection and vehicle preparation as required.
- Select "Vehicle and Engine Selection" menu.
- Select year, engine, model with the appropriate qualifier if needed, for example, transmission or 49 state /Cal.
- Select "Diagnostic Data Link" menu.
Select "Diagnostic Test Mode" menu.
- Select "KOEO On-Demand Self Test."
Follow operating instructions from the NGS menu screen.
- Record all DTCs displayed.
Service non-transmission DTCs first as they can directly affect the operation of the transmission. Road test the vehicle and repeat Quick Test to verify the repair.