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International Automotive Technicians Network
Re: No Engine ECM or Emissions ECM
Posted to HD/Fleet Forum on 2/24/2021

If you have the interface and cable, connect into the Cummins J1939 triangular connector on the engine - If nothing, check ECM power supply both battery and ignition (and the ECM ground of course). If the ECM is powered and switched on, and at least the engine... Login to read more.