Do you need resistance on MS CLT and IAT sensor leads? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 02-04-2012, 08:35 PM   #1
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Default Do you need resistance on MS CLT and IAT sensor leads?

I am keeping my stock PCM for gauges, AC, and fan control.

I've noticed when my MS is plugged in, my Coolant gauge is slightly lower than it normally is. If I unplug it, it pops back up and my fans come on if I am hot enough. So it's clear that the MS is causing my PCM to see lower temps.

The question is, did anyone else have this problem, and does throwing a resistor on the feed to the MS fix the problem.

I didn't have any more 10ks laying around and it was too late to make a trip to radio shack, so I used 1ks and it seemed to help, but not completely as it still seems just a tad lower than it should be.

I can try more resistance, but it just seems weird that none of the install guides I have read mention this. Could be because most people are running stand alone and forgoing the stock gauges.
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Old 02-04-2012, 10:26 PM   #2
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Ok, adding stuff as I find it. I am dumbfounded that no one on the MSP forums ever mentioned this, or there isn't at least a note somewhere on the 3.0v assembly instructions, but I did eventually find this link which answered that question. Now I kind of feel like an idiot for putting in the 1k ohm resistors inline.

http://www.megamanual.com/v22manual/sharesen.htm
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Old 02-05-2012, 09:11 PM   #3
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It's kind of addressed in the "How to make and install your own DIY megasquirt" thread.

https://www.miataturbo.net/useful-saved-posts-8/how-make-install-your-own-diy-megasquirt-13676/ In post #2 , in big bold letters, it states:
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You'll notice I've removed R7 and left the hole vacant, only do this if doing a parallel install with plans to share the stock CLT sensor with the MS. If doing a standalone install leave R7 installed.
Post #7 lists which resistance values to use if sharing sensors.


Glad to see you got it all worked out though.
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Old 02-05-2012, 11:09 PM   #4
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Yeah thanks, this wasn't where I first started. I'll have to write up a much better guide for the msp guys when I have it all done because I am sure 90% of the guys want to keep their stock gauges.
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