I gave away a 1.6 rear end, some airbag shit, a bunch of emissions crap, and basically a bunch of shit you don't want.

I don't know if i can give that up...maybe.

does anyone know what the 3-pins on the NB water temp sensor do?

Any chance one of those could be used in place of the NA front sensor?

Fingers crossed so I don't have to give money to a machine shop.

I tried jumping 1R and 1Q and I still get no fan when i take both circuits to GND. I'm really confused and tired. I almost melted down the motor last night when driving home from the bar.

Can I use one of the other outputs to trigger the fan? I could use the boost control output, but not sure which to configure.

Thanks for the help as usual.

this shit is fucking gay. WTF does a nigga have to do to get a god damn fan working?!?!?!?!?!?!?!?!?!?!?!?!

c'mon, my back is against the wall.

If the fans come on with closure to ground manually, why haven't you wired up a switch in the mean time til you figure out the megasquirt issue? This would keep you from "melting down" your brand new expensive engine.

Edit:
I just realized this is a 3 page thread that I didn't read through...you may have alrdy done this.

It's really pretty simple:

http://img19.picoodle.com/img/img19/...nm_da22b13.png

If grounding the black / green wire at 1R isn't turning on the fan, then something's wrong and you need to troubleshoot it. Is the cooling fan relay good? Is there power getting to the socket where it should be from the 30A "cooling fan" fuse and from the main relay? Is the fan plugged in? That kind of stuff.

I can gnd the front sensor connetor and 1 fan turns on
I can turn the fans on with the AC switch
pin 1r to gnd and I get nothing
pin 1q to gnd and I get nothing
yes, its hot at the fuse.
the fan relay works in my other miata just fine
front sensor is not hooked up because supposedly ms doesn't use it
I think every connection is good

thanks for the help.

just bumping this again in hopes that someone can help me. I've wasted about 2 hours on it today retracing steps and can't figure it out. If the relay works, the fuse works, and the wires are connected with continuity at GND, shouldn't the fan switch on? I'm almost certain the problem lies in the car.

Anyone care to tell me how to crack open the computer and check the circuitry?

One of these

http://blog.stackoverflow.com/wp-con...rewdrivers.jpg

The fan activation circuitry is just a simple transistor and a couple of resistors, you'll need a decent multimeter to test the transistor. As an educated guess it'll be located on the custom breakout board that DIY designed for the pnp. Probably labeled too.

hey hustler did you ever figure this out?

i'm having the same issue...

I have a multimeter but can't do much more than check continuity with it. Which reminds me that I have continuity with GDN at that pin, so I know MS is working correctly.

I'm pretty much "over working on this thing.

do you have the front clt sensor / gnd fan switch hooked up?

nope, i deleted the sensor altogether when i did my reroute... after my swap i was just grounding the sensor plug and keeping the fan on constantly...

i'm also having issues with my fuel pump not turning on... if i jump the fuel pump in the diag box, car starts no problem, the moment i remove the jumper the car dies....

but today i was dicking with it, and was idling it with the fuel jumper in place, and noticed the my coolant temp was well above the 175 diy engagment point, the light on megatune indicating output 2 was green and "on"... but the fan didn't turn on... i did everything you did.. i know the fan works because it turns on when i ground it, the relay is working because i can here it triggering when i ground and unground the sensor plug... but ms won't turn it on...

-J

ok hey hustler, you know how on the ecu there is a big yellow plug and little yellow plug...

there is one black and green wire on the little plug... i ground it and my fan turned right on....

so that means it has to be a megaquirt issue right?

hey hustler... i was talking to someone and this might work as a temporary fix for you...

at pepboys, they sell kits that allow you to add electrical fans to older cars... basically the kit include a thermo sensor that clips into the radiator... you can wire it to where the front clt sensor plugs in... so that when the temp rises in the radiator the thermo switch will complete the ground, and the fan will turn on...
its about 25-30 bucks...

-J

I just had a moment of brilliance!!!!

How can I make the "boost control" output switch to GND and operate the fans? I'm going to wire it into the factory "front" sensor until I have more time to diagnose. At least then I don't have to worry about overheating the car in traffic, and I can manually switch on both fans via the AC switch on the track if necessary.

i'm not so lucky, i've been communicating with the diy guys via email, and after checking all the volt readings with them, they want me to send it in....

so now i'm filing a claim with ups.... f' me for buying a used unit....*sigh*

This is pretty straight forward. You'll connect the EBC output(pin 7 on the "center" connect that we supply with the MSPNP.) to the fan relay signal wire.

Then you'll need to switch everything around in the software. What you need to do here is open up MegaTune, with the MSPNP powered up. Then go to "file" and then "Codebase and output functions" and then look for the "X4(JS2)" pin setting on that screen. Switch it from "boost control" to "Output 1"

Then you'll go to the "more settings" menu tab, and choose "outputs" then go the "output 1" on that screen, and turn it on, and fill in all of the variables you want.

The outputs section of the MS1/extra manual will explain how to set that one up a bit better, MSnS-Extra Hardware Manual Note that you do not need to build that circuit, you're only on that page to read about what the variable settings do to help you set this up for your car

OK, I'm in a little over-my-head here. What must I do to just set up this circuit to switch to GND when I want the fan to come on at 205*f?