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Old 03-27-2011, 02:39 AM   #1
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Default Squirting a former automatic car

My head is exploding from the massive amounts of info on MS. I'm trying to find out understand the differences there are in the wire harness from a 90-93 (federal) 1.6 automatic car.

My car in particular has been converted to a stick before I ever drove it and as far as I can tell it has a 4 wire VTPS that is wired different in the harness than manual cars. And looks to be the only difference ...I think.

Some diagrams show "if car is prewired for VTPS must unplug stock tps" which confuses me even more.

From what I can figure out if/when I build it (or buy and modify one) pin 22 on the MS would go to 2m on the ECU harness and pin 26 would go to 2k? The black green wire would just be left alone and the red (1n connector on the auto harness) would be left alone.

Any and all help is much appreciated,
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Old 03-28-2011, 05:27 PM   #2
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Does it have the manual or automatic wiring harness? An automatic harness would have a torque converter lock-up output on one of the pins '93 California cars used for sequential injection, a different TPS wiring setup (the note about unplugging a stock TPS means a stock manual transmission TPS), and that's about it as far as MS installs are concerned.
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Old 03-28-2011, 06:00 PM   #3
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I did the exact same thing to my car. It is exactly as Matt said. You have to look at the pins for the VTPS and wire them right.

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Old 08-19-2011, 01:53 AM   #4
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Just thought I'd update this, did exactly as redrider said.

Originally Posted by redrider 706
The image in the harness building section of miata turbo FAQ wiki shows that +5vref connected to 1N. That is wrong. The +5vref from the megasquirt should be connected to 2K and the tps input if from 2M. Do not connect anything to 1N. 1N is shorted to ground when the throttle is closed.
Here is how the auto harness should look for the TPS to work.
2M is the blue TPS (instead of 2L)
2k is grey 5vref (instead of 1n)

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Squirting a former automatic car-90-93-autoharness.jpg  
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