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Old 09-06-2013, 08:55 PM   #1
dcnatty1
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Default TPS problems

Whats up guys Ive recently purchased an 89 CRX with a z6 swap in it. Its still 0bd0 but has been converted from DPFI to MPFI. My question/problem is that I changed out my TPS today and when calibrating it, its reading 4.5v at closed throttle. Ive changed out many TPS and I know its supposed to be set @ .45v closed throttle. Its weird bc its like it is reading backwards, instead of going from .45 @closed throttle to 4.5v @ WOT its going 4.5v to .45v. If anyone has any idea why please let me know. Thanks in advance for any advice.
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Old 09-06-2013, 10:48 PM   #2
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Default Re: TPS problems

id say flip the TPS wires, the outside 2 o_o thats usually what causes that problem but since its already had a MPFI swap the harness for the TPS should already be flipped.

id say check the TPS wiring and cut/strip and just soft connect the wires (twist them together) and then test that to see if its getting the correct readings. if so then solder the connections and then heat shrink it for protection!
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Old 09-07-2013, 06:31 AM   #3
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Default Re: TPS problems

You are using a CRX DX (DPFI) TPS. Those spin backwards so they read 4.5 volts when closed. You need a MPFI TPS from just about any other Honda/Acura that use the same style TPS.
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Old 09-07-2013, 08:50 AM   #4
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Default Re: TPS problems

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Originally Posted by Spaceballsthelunchbox View Post
You are using a CRX DX (DPFI) TPS. Those spin backwards so they read 4.5 volts when closed. You need a MPFI TPS from just about any other Honda/Acura that use the same style TPS.
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Old 09-09-2013, 05:44 AM   #5
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Default Re: TPS problems

I switched it to a blox TPS bc it was jumping at partial throttle. I will check the harness and get back with you guys. Thank you for the advice.
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Old 09-09-2013, 06:35 AM   #6
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Default Re: TPS problems

Isn't the Z6 OBD1 though? Thought you'd have to convert to OBD1 to run a MPFI D series motor.

BUT, the TPS is probably caused by the outside wires not being switched during the conversion. Easy fix. Try what was previously said. Good luck.
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Old 09-18-2013, 03:31 AM   #7
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Its running on a pm6 si ecu. I didn't do the conversion on the car, I bought it that way. I switched the 2 yellow wires around and it solved the problem thanks for the info guys.
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Old 09-18-2013, 05:29 AM   #8
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Default Re: TPS problems

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Originally Posted by dcnatty1 View Post
Its running on a pm6 si ecu. I didn't do the conversion on the car, I bought it that way. I switched the 2 yellow wires around and it solved the problem thanks for the info guys.
So weird that it came like that, with the TPS not right. Quick and easy fix at least. Does it have VTEC? It would need a chipped pm6 then.
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Old 09-18-2013, 10:39 AM   #9
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Thought you'd have to convert to OBD1 to run a MPFI D series motor.
No, not at all.
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Old 09-18-2013, 11:20 AM   #10
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Default Re: TPS problems

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No, not at all.
Let me pull half the shoe out of my mouth, a VTEC D series motor. I wasn't thinking of the D16A3 in the CRX Si when I posted that. But I also forgot about chipping the PM6 to support a rpm switch to activate VTEC. That would let you stay OBD0.

Gosh, so many set ups and so hard to keep track of it all. My mistake.
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Old 09-18-2013, 02:22 PM   #11
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no vtec bc its not chipped and yes lol there are so many different setups they are hard to keep up with lol. I was unaware that the obd0 ecu ciuld he chipped. Who do I need to contact to have it chipped?
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Old 09-18-2013, 02:55 PM   #12
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Default Re: TPS problems

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no vtec bc its not chipped and yes lol there are so many different setups they are hard to keep up with lol. I was unaware that the obd0 ecu ciuld he chipped. Who do I need to contact to have it chipped?
Well, honestly, anyone can chip it. I would do it for free if I had a chip burner. It's desoldering and resoldering in a chip. Basically.

You should check out pgmfi.org to find out about chipping the PM6 and the 1 wire VTEC. It's quite amazing stuff really.
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Old 09-18-2013, 06:00 PM   #13
dcnatty1
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Default Re: TPS problems

I'm familiar with chipping the obd1 ecu, but not the obd0 lol. Thank you for the info. The vrec is wired and ready.
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Old 09-18-2013, 08:23 PM   #14
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Default Re: TPS problems

Glad you fixed it. The previous owner probably sold it thinking it was an expensive fix, hope you got it for a good deal.
For the VTEC, just get an ebay jumper harness and P28 ecu Or an OBD0 PR3 VTEC ecu should work fine, that'll be the cheaper choice. If I'm wrong there, somebody please tell me
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Old 09-19-2013, 09:04 PM   #15
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Default Re: TPS problems

Yeah he didnt really know much about them and needed back seats so i got a great deal. I traded a bone stock dpfi hatch that I had $200 in Thanks for all the help guys I really appreciate it.
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