QT2 ENGINE RUNS ROUGH AT IDLE WITH KEY ON ENGINE RUNNING OR CONTINUOUS MEMORY DTC(s): CHECK INJECTOR FAULT (INJxF) PID(s)

NOTE: An injector circuit fault could result in unrelated DTC(s) being received from the PCM.

Key on, engine off.
Access the INJxF PIDs (the "x" indicates the injector number). There will be one INJxF PID for each engine cylinder.

Do any of the INJxF PIDs indicate a fault (or Yes)?

Yes	No
An injector circuit fault exists. KEY OFF. Disregard DTC(s). Natural Gas applications: GO to A: Natural Gas Fuel Control STEP HA27. All Others: GO to H: Fuel Control STEP H46.	No fault detected by injector fault PIDs. KEY OFF. GO to QT1 and follow the YES Action To Take for all others.