Cooling fan coming on at 125

[challengermike]

What would cause my cooling fan to come on at 125 according to my scanmaster reading.I have a TT 5.6 chip.It was always coming on at 150 since i built the car and i thought that was normal,but other people say erics chips are set for 166.This car does have a replacement ecm from napa in it since i put it together.Im not sure if it would be an ecm,sensor or wiring problem.

[daveismissing]

Low speed or high speed?

[Steve Wood]

being that it gets it's low speed command  from the chip via the ecm, the first question I would have is-the ecm coolant sensor reading properly?  Does your temperature gauge read the same as the scanmaster?

diagrams for fan wiring on my site under Troubleshootin g...

[challengermike]

Ok so i sent the emc to eric and he plugged it into his car and it worked fine.So i got it back today and started to try to figure out what was going on.I did figure it out and it was

[Steve Wood]

I saw Eric's reply.  We have all done things like that.  I have done it many times so don't feel bad.  The main thing is that you got it working right.