MS PNP in: No Tach?
 

Hello guys,

My buddy just installed my MS PNP(its for a '95)in my car last night. He read the manual and did everything step by step. He said the car runs much better than it did with the old ECU.

The only thing that is a problem is the tach doesn't work. He tried to go back and redo the whole setup again but still nothing. I'm currently deployed so I can't work on it right now but I just call him and talk from there. From my understanding after you do everything in the manual all should work great.

Any help is greatly appriciated.

1k ohm resistor in the diagnostic box did it for me. Look up an old thread about this in the MS section.

I don't understand why it wouldn't run though? I read the manual too, watched all the videos, and it should run just like the original ECU. Just seems a lil puzzling to me.

Who did you buy it from??

From DIYAutotune. Its the PNP for the 94-95.

Then you posted in the wrong section (I think). There should be a PNP sub-section. I thought it was one of the MS assembled by Brain or other builders. I had the same issue when I installed mine. However, I have an MS not a PNP.

Good luck.

Oh, I see it now. Guess I didn't see it when making this. 12 hrs of work will do that to ya. lol Could a mod please move this for me?

The tachometer should work correctly with the MSPNP. Does the tach work with the stock computer? How many wires go to each coil pack (3 or 4)?

From last I heard it was working perfect before the ECU change. He said that everything on the system runs way better but the tach just doesn't work. I'm not sure on the coil pack question as I won't be home until March. I'll ask my friend to look right now.

Check the label on the bottom of the MSPNP - what revision do you have?

Asked my buddy and he said its mm9495 v1.01.

No revision letter code? If so, you have an early one (about 3 years old - was it bought used?) that didn't have the 95.5 tach output mod. In that case, you'll need to take the wire at pin 1F and splice it to the 2I wire.

Would jumping the diagnostic box work in this case?

I literally just bought it from you guys. IDK if it has a revision code or not. I'll have to ask my buddy on that one. I'm 7500 miles away so I can't say.

"Update"

So I talked to my friend and did some research. It turns out that half way through 95 they switched coil packs. Mine was made in Jul 95 so it has the 4 wires going to each coil pack. My question is what do I have to do to make my tach work?

Under advanced settings, there should be a selection labeled "tach out". is it turned on?

I'll ask my bud to check it out. Thanks brain.

Ok, so this is what he sees under the Tach Out tab:

K gives me options, x2jso, x3jso, x4jso, x5jso, output3, pin10

Which one should he pick?

I believe it's X2 (JS0). DIY can confirm.

Confirmed - it should use JS0 for tach output.