Variation in TPS each time I look
#21
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No offense Mike, but I don't have a car sitting in front of me to look at to know which is top or bottom. I gave you a screenshot of the wiring diagram that shows a picture of the connector (with positions) and even gave you the colors.
That said, I think we are 99% sure that you are getting 5v to the TPS.
What is interesting though is the .5v that you are getting on the top wire.
![](https://www.miataturbo.net/attachments/megasquirt-18/110214d1397949410-variation-tps-each-time-i-look-screen-shot-2014-04-19-6.15.50-pm.jpg)
According to that, the wire you are getting .5v from SHOULD be a ground. Instead of metering voltage, check resistance to ground. I am guessing this has something to do with your problem.
That said, I think we are 99% sure that you are getting 5v to the TPS.
What is interesting though is the .5v that you are getting on the top wire.
![](https://www.miataturbo.net/attachments/megasquirt-18/110214d1397949410-variation-tps-each-time-i-look-screen-shot-2014-04-19-6.15.50-pm.jpg)
According to that, the wire you are getting .5v from SHOULD be a ground. Instead of metering voltage, check resistance to ground. I am guessing this has something to do with your problem.
#22
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I will double check in the morning when I have better light but those are different colors than I have. It looks like mine are B/LG = 5v, B/R = Ground, G/B = .5v
I will verify everything tomorrow to be sure. But I wired the VRef to the B/LG, Ground to B/R and TP Signal to G/B
Thank you for your help (sorry, I was out to dinner earlier)
I will verify everything tomorrow to be sure. But I wired the VRef to the B/LG, Ground to B/R and TP Signal to G/B
Thank you for your help (sorry, I was out to dinner earlier)
#24
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You sure brain? That's not the way it looks in the wiring diagram.
B/R = Black with Red stripe = sensor ground
G/B = Green with Black stripe = signal
LG/R = Light-Green with Red stripe = vref
I am confused though because black/light green doesn't show up as a throttle related wire. Mind you, my wiring diagrams aren't for a 2003 but I have one for both a 2000 and a 2001 and they both agree with the colors and signals I posted here.
EDIT:
Rather than argue about it I just went outside and metered my own.
![](https://www.miataturbo.net/attachments/megasquirt-18/110235d1397967839-variation-tps-each-time-i-look-throttle_plug.jpeg)
My wires meter out as:
B/R = Black with Red stripe = sensor ground (ground)
G/B = Green with Black stripe = signal (happens to be just under 5v at the moment for some reason)
LG/R = Light-Green with Red stripe = vref (5v)
B/R = Black with Red stripe = sensor ground
G/B = Green with Black stripe = signal
LG/R = Light-Green with Red stripe = vref
I am confused though because black/light green doesn't show up as a throttle related wire. Mind you, my wiring diagrams aren't for a 2003 but I have one for both a 2000 and a 2001 and they both agree with the colors and signals I posted here.
EDIT:
Rather than argue about it I just went outside and metered my own.
![](https://www.miataturbo.net/attachments/megasquirt-18/110235d1397967839-variation-tps-each-time-i-look-throttle_plug.jpeg)
My wires meter out as:
B/R = Black with Red stripe = sensor ground (ground)
G/B = Green with Black stripe = signal (happens to be just under 5v at the moment for some reason)
LG/R = Light-Green with Red stripe = vref (5v)
Last edited by Chiburbian; 04-20-2014 at 12:28 AM.
#31
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I wasn't looking to be honest. All 90-97s use b/lg as a sensor ground wire and that went out the window in 99. so when I saw the reference to that I was like well there's an issue.
Looks like I was still correct about the wiring issue, lol.
Looks like I was still correct about the wiring issue, lol.
Last edited by Braineack; 04-21-2014 at 08:15 AM.
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