Engine fan won't shut off 99 379 w/ a 60 series

On the contrary, while there are external switches that control the fan clutch. The ECM can and does send a signal to also turn the fan clutch on. I believe I have successfully tested all the external switches proplerly, and also looked at all the ECM I/O parameters that can power up the circuit, everything looks in spec. I appreciate all the advice. Hopefully I can catch someone on here with more knowledge of the DDDL platform then me. (Which isnt much) Thanks to all that replied.

 

Do you know what parameter in the input/output changes that setting?

 

A little background.... I bought the truck and immediately it needed a new ecm. While the engine fan sounded like it was running occasionally, I was never personally driving the truck very much. About a month ago, the fan clutch bearing failed, so I replaced with oem new. At the same time I went through the truck and replaced the dash bulbs, that is when I noticed the engine fan light was always on. I then replaced the air solenoid, still on. I then checked all external sensor and switch wiring, still on. I then found and replaced engine fan relay, still on. I have looked @ the truck while hooked up to DDDL and didn't see anything out of spec. But, I am not familiar enough with the software or platform to know where to look to see if it is programmed for a horton hub.

 

No, I am saying I am going to assume it was on the entire time, I just don't think the bonehead driving it noticed, and it didn't come under my radar till I replaced the burnt out "engine fan" warning bulb the same day I installed the new Horton.

 

I bought it and had it installed at a trustworthy detroit shop that I have a good relationship with. They are trying to help me with it. But it was a year ago, so I don't expect them to take it in without it costing me. (Which might be what I get stuck with) I am just trying to work through it on my own witha little advice from other. *Stepping over a dollar to save a dime! LMFAO