code 31 TPS

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prodrive
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code 31 TPS

Post by prodrive »

i got a code 31.(91ss with jdm ver2 ej20g and ecu)
it comes on right after ignition on.
clear the code but still comes back.
perform input and output test.
i got 4.6v on closed and 0.5v on WOT
any idea?
vrg3
Vikash
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Re: code 31 TPS

Post by vrg3 »

Are you measuring the voltage at the ECU pins or at the TPS?

How does the car drive? Does it stumble when you first press the throttle?
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
prodrive
First Gear
Posts: 176
Joined: Mon Nov 16, 2009 5:49 am
Location: socal

Re: code 31 TPS

Post by prodrive »

i measured it from ecu pins.
car drive normal but it stumble when i first press the throttle.
vrg3
Vikash
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Re: code 31 TPS

Post by vrg3 »

Hmm, that's odd. All I can think of is that either the harness connector isn't making good contact with the ECU pin, or there's a problem inside the ECU.

It might be possible to pull the contact out of the harness connector and kind of bend the metal slightly to make it grip the ECU pin more firmly.

Did the problem just come up out of nowhere one day?
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
prodrive
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Posts: 176
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Location: socal

Re: code 31 TPS

Post by prodrive »

problem started after i did ej20g swap
vrg3
Vikash
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Re: code 31 TPS

Post by vrg3 »

Oh, so it's been there the whole time... How did you wire in the EJ20G ECU? Just used the stock wiring and modified it for the extra ignition channels? If that's what you did, and there was no code before, I guess that means the ECU is more likely. You don't have access to another ECU to test, do you?
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
prodrive
First Gear
Posts: 176
Joined: Mon Nov 16, 2009 5:49 am
Location: socal

Re: code 31 TPS

Post by prodrive »

found the problem.
worn out or loose pins cause code31.
replaced all three pins and problem fixed.
thanks
vrg3
Vikash
Posts: 12517
Joined: Sun Nov 03, 2002 2:13 am
Location: USA, OH, Cleveland (sometimes visiting DC though)
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Re: code 31 TPS

Post by vrg3 »

Nice work.
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
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