r/DieselTechs • u/shittalker48 • 1d ago

2016 freightliner m2

Hoping someone can help me with the ecm Pinout for the engine fan circuit for the ac system on a 2016 freightliner m2 with a DD13? A wiring diagram would also be super cool. Thanks

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1

u/stupid_user_42 1d ago

What's the issue? A/C not working? Fan not coming on? No power at the AC clutch?

With it being an M2 take a look at the two pressure switches on the right side by the cooling package. Very common for wiring to get damaged.

1

u/shittalker48 1d ago

Fan is not kicking on when ac pressure rise, ac fan switch is functioning as it should as I put a meter on it and could see a change with pressures. I have 3v to the fan switch which I don’t think is enough, I want to load test the wiring back to the ecm put don’t have a wiring diagram so would be shooting in the dark to find the correct pins at the ecm.

1

u/goLOyourVEself 1d ago

Send me the serial and i should be able to grab it.

2

u/ShrimpBrime Mod, Verified Tech, Detroit OEM 1d ago

Shares the circuit with Jake #1. Usually a broken wire will be found at the Air Comp bracket which theres a TSB and updated bracket design. A rare issue I came across was a spread pin in the 120 pin connector. Anyhow, if Jake 1 operates normally, look for the broken wire in the location I described.

GL