Do you need resistance on MS CLT and IAT sensor leads?
#1
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.
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.
#2
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
http://www.megamanual.com/v22manual/sharesen.htm
#3
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:
Post #7 lists which resistance values to use if sharing sensors.
Glad to see you got it all worked out though.
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:
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.
Glad to see you got it all worked out though.
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