kags1969

Well if i remember right, all you need to do is ground out the pins on the ecu in order to trigger the fans. There are two ecu pins for the fans, one is for the a/c fan, but if you jumper them, when one turns on they both turn on. Seems like its 1R and ?? on the stock ecu pin out on a 1990 model.

Philip

kags1969

Well in order to run the MS as a full standalone, you need to control the Fuel, Timing at a minimum. Controlling the fan through the ecu to come on and go off at certain temps is a good thing. I am a little confused about m1/m2 fan works. On a 94+ car you can jumper two wires on the ecu. These are pull down to ground and they trigger a relay that turns on the fans. You wire them together so that if one is pulled to ground, they are both pulled to ground and both fans come on.

I am trying to figure out how the MS can run this operation. If I can control fuel/timing and the radiator fan from the ecu, then it would funcition as a standalone for me... bye bye maf...

The thermresistor on the back of the head is the one that controls the fan, and I know it runs throught the ecu, b/c it will throw a specific code if it is bad. In my mind I just have to get the MS to pull down based on that signal and I am cooking with gas.

Chris

PS Two fans are better then one, so if I can trigger them both at the same time, even better.

medisyn

Why not just leave the Stock ECU in the car to control the fans and as a backup incase you have issues with the MS? As far as I know the stock ecu will be nice and happy just turning on the fans. And you can still have no afm/maf

ecugrad

Why not wire the fans so they run all the time? I did it in my CRX with no ill effects.

Aussie Driver

I built up a thermo switch from Jaycar to control the fans in my car. I'm not too keen on wasting a MS output for anything that can be easily controlled by something else.

Steve

sabretooth

I have the Jaycar voltage switch operating my thermofan, also. It works perfectly.