Quick Test 3.0 - Key ON, Engine OFF (KOEO)

CAUTION: Do not replace parts based on a code. Perform pinpoint tests first.

Some special considerations for Key On, Engine Off Quick Test include the following:
- The KOEO test provides hard Diagnostic Trouble Codes (DTCs) present at the time of testing.
- Always repair 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.
- Repair non-transmission DTCs first since they can directly affect the operation of the transmission. Road test and repeat Quick Test to verify the repair.