Circuit/System Verification

Engine idling, observe the DTC information with a scan tool. DTC P1668 should not set.
- If DTCs P0654 and P0656 are also set, refer to Symptoms - Instrument Panel, Gages and Console for further diagnosis of the IPC.
If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.