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Old 08-06-2009, 03:29 PM   #1
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Default 91' automatic tps problem with megasquirt

I'm pulling all the stuff together to turbo my 91' so I just ordered a MS1 PCB3.0 kit. My car used to be an automatic, but I swapped it out for a 5spd. All I did was swap the transmission so all the automatic electronics are still in it.

I thought I read somewhere that the automatic trans has a potentiometer tps and the manual has a simple on/off tps that only indicates full throttle. So my question is, a) is that correct about the tps and b) if it is correct what circuitry modification will I have to do to make it work (or if it is the same as 94 and up to wire the mega squirt that way)

-Spencer
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Old 08-06-2009, 03:35 PM   #2
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a) Yes.

b) No mods, same as '94-'95. Connect MS pin 26 (Vref) to ECU pin 2K (grn/red). Connect MS pin 22 (TPS) to ECU pin 2M (red/blk). Then just calibrate the sensor in MegaTune.
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Old 08-06-2009, 03:49 PM   #3
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Sweet, thanks for the info. Looking forward to being turbo'd
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Old 08-06-2009, 03:57 PM   #4
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Be sure to drink your Ovaltine.
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Old 08-06-2009, 04:31 PM   #5
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Wait so the auto na's befor the 1.8 had a better tps? HUH that's good to know!!
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Old 08-08-2009, 06:01 AM   #6
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Yes, the automatic uses a variable TPS which gives better throttle response, but the MSPNP doesn't usually use this feature and they work fine.
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