Quick Test 5.0 - Key On Engine Running (KOER)

This test provides "hard" DTCs only.
- Follow the menu screen instructions as they appear.
- If a DTC appears after the key on engine running (KOER) test, a malfunction is present. Refer to the DTC Code Chart for service information.

Performing KOER
- 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 "KOER On-Demand Self Test."
- Follow operating instructions from the NGS menu screen (example: turn key on, etc.) and perform brake on/off (BOO) and cycle the transmission control switch (TCS) on and off, if equipped, rotate steering wheel.
- Record all DTCs displayed.
- Service all 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.