TPS problem 94 chassis
Hey guys so I have a 1994 Miata chassis with an NB engine. I am trying to calibrate the TPS with the 94-95 mspnpv2 and it is reading too high (1023).
I have an 99/00 skunk2 throttle body and I am using an NB tps (I believe the 94 TPS harness will not plug into the NB tps?) I followed this reference and tested the harness if it is receiving the correct amount of voltage. The harness is receiving the right amount of voltage: The 1994-1997 chassis did come with a 0-5v variable TPS. It is a standard 3-wire TPS with an additional fourth wire (red) which serves as a wide-open switch. Your standalone ECU will likely not use this fourth wire, so if you are changing the pigtail to a 99-05 style, simply heat-shrink over this unused wire. If you are using your 94-97 throttle body, there are no wiring changes necessary. If you are using the 99-05 sensor, wiring colors are listed below: 5v Reference: 94-05: Light Green/Red Signal: 94-97: Red/Black 99-05: Green/Black Ground: 94-97: Black/Blue 99-05: Black/Red https://www.miataturbo.net/engine-pe...athread-80469/ Another question, I have 2 mspnpv2's. Can I simply use my 92 mspnpv2 on my 94 chassis? The 92 mspnp has my original map. |
92 MSPNP won't work in the 94 without a patch harness, the pinouts are different.
If you let your car sit for a few hours, is the TPS immediately at 1023? I ask because a grounding issue would cause the TPS signal to go from 0 to 1023 slowly after you turn the key on. Let your car sit overnight and check the TPS signal immediately when you key the car to ON. |
Originally Posted by Onyxyth
(Post 1317973)
92 MSPNP won't work in the 94 without a patch harness, the pinouts are different.
If you let your car sit for a few hours, is the TPS immediately at 1023? I ask because a grounding issue would cause the TPS signal to go from 0 to 1023 slowly after you turn the key on. Let your car sit overnight and check the TPS signal immediately when you key the car to ON. The TPS showed 1023 at no throttle and at WOT throttle. I assumed it was the tps so I was tapping it to see if it made a difference.. it stayed the same. The TPS was fine when I pulled it from the other 92 shell. When I tried starting it, megasquirt was showing me that the rpms were not kicking either. |
I forgot to mention, I used a speaker wire to jump the tps and car has no spark now...
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your wiring created a 5v fault to ground.
this may help you (this is a 1.6L reference doc): https://www.miataturbo.net/attachmen...ine=1458836112 |
Originally Posted by Braineack
(Post 1318055)
your wiring created a 5v fault to ground.
this may help you (this is a 1.6L reference doc): https://www.miataturbo.net/attachmen...ine=1458836112 |
2 Attachment(s)
Updaate:
I downloaded the new mS2/Extra 3.4.1 release Firmware from Megasquirt Downloads Firmware and Software - Megasquirt EFI Car is reading tps even though I do not have a jumper on it. I was able to calibrate it without any jumper.. odd.. I calibrated the IAT, Injectors, wideband, and set the timing to 4g63. I am receiving no spark. I do have fuel ( I can hear the pump priming at key on).. I attached my MSQ file and a composite logger. fyi, I am not sure if I did the composite logger correctly, but I'll do it again if necessary. |
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second log. Cranking, then after a few cranks it would stop..
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changed cas... tried to start it, heard a loud "poof" sound and still doesn't start.
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