Diesel exhaust fluid (def) line heaters are internal of the def lines. The heater electrical connectors are located near the def line couplings. Webi have a code for heater line 1 open circuit. I have ran through all of the cummins troubleshooting steps and i've come to a wall in where to go. My voltage across the. Webthis diagnostic is typically line heater 3 open circuit. Check for multiple codes. If spn 4356/fmi 5 and spn 4354/fmi 5 are present, repair open between pin 9 of the. Webjan 4, 2022 · ohm test and load test the wiring from the ecm to the def dosing unit. You most certainly have a rubbed or corroded wire or bad connection somewhere between.
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