KiD

Done a lot of reading but first time poster. I have a 99 with an FM2 gt2560 kit. I recently installed a MS3PNP. Install and set up was a breeze. While attempting to set up idle tune and do all the basics, my fan refuses to turn on.

I am running a mishimoto twin fan which I hardwired into the factory harness. I ran that set up for over a year with no issues. Now that I installed the MS the fan will not turn on. It says the fan is on in tuner studio but it is not (the factory relay is good I checked there first)

I tried the programmable outputs and the fan control both using PWMout2 which should control fan. (Pictures below)

Any help would be greatly appreciated. I didn't want to post a dumb question but I just can't figure out how to get the fan to come on.

Thank you

Dr.Sep

Did you check the relay and the fuse, or confirm you’re getting power to the fans?

KiD

I will check fuses when I get home but don't recall seeing a "fan" fuse on the 99.

poormxdad

I believe there's a relay in the box by the washer fluid tank. I had a similar issue that turned out to be the connector at the fan.

KiD

So... here was my fix (insert🤦‍♂️). I ran a port test until the fan came on. Port injector j ran the fan. Everything is happy now and fan comes on at 195f.

Thanks for the ideas, which ultimately lead me to my fix.