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Old 04-05-2009, 09:08 PM   #1
winston856
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Default Tell me all you can about P1722 CEL

I've got a 4EAT to 5MT swap in my '96 LGT, everything works fine except I have this stupid CEL that keeps sticking around every time I clear the codes.

LGT's only came with Auto's in '96 hence the swap, the donor car was a '95 legacy 2.2L that we took the trans and everything out of. I got a cruise control brain out of a '97 or '98 outback 5MT since my 4EAT one wouldn't work.

We converted the AT ecu to a MT and I had a P1702 code, well recently I bought an ECU for a '97 LGT 5MT and plopped it in there. Now the code I have is a P1722 which is slightly different than the P1702.

It's got to be something simiple because the car runs well, only exception is the cold start, I have to keep my foot on the clutch to keep fast idle at 1500RPM, if I let my foot off it goes up to 2500rpm's, but I can let the clutch out and push it back down and they will drop down to about 1000rpm, then I can let the clutch out and the rpm's rise up to about 1800 then settle back down to about 1100 ish. Kinda weird but I'm used to it now.

Anyway, can somebody lend me a hand here? Is it just a wire to snip or what? I've got emissions coming up pretty soon and want to be CEL free
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Old 04-06-2009, 02:14 PM   #2
Zephyr
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Chances are there is a pin on the ECU that needs to be grounded indicating that the car has a MT.
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Old 04-07-2009, 01:05 PM   #3
winston856
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That's what I thought but I have the Ecu out of a manual car so I shouldn't have to ground anything right?
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Old 04-07-2009, 02:07 PM   #4
Zephyr
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doesn't matter what ECU you are running you still need to have that ground wire in there. It should go to pin 81 if the pinout for the 97 is the same as the 98. this then gets tapped into the same group of wires as pins 19, 42 and 46.
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Old 04-15-2009, 05:58 PM   #5
Sir Punk
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I have the same problem. do you also get P1116? I get them both after I reset and only after the second time I turn on the car.

what do you do to ground it? Or I guess I know how to do that but what do you ground it to?
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Old 04-16-2009, 11:53 AM   #6
Zephyr
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Since you have done a AT to MT conversion there are now a few unused pins down by the ECU. Remove one of these pins and move it to the indicated pin on the daigram that is missing. About 8-12 inches up from the ECU strip back the wire on the Black/Red wire that is the ground and splice it into that circuit. Problem solved.
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Old 04-29-2009, 01:55 PM   #7
Sir Punk
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Quote:
Originally Posted by Zephyr View Post
Since you have done a AT to MT conversion there are now a few unused pins down by the ECU. Remove one of these pins and move it to the indicated pin on the daigram that is missing. About 8-12 inches up from the ECU strip back the wire on the Black/Red wire that is the ground and splice it into that circuit. Problem solved.
could you please point out which ones. I don't see pin 81, 42 and 46.
do you know exactly the function of them?

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Old 04-29-2009, 03:03 PM   #8
Zephyr
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On the 99 RS it is a different pin as you have a three plug ECU. On the Legacy and earlier Impreza you have one large plug that goes into the ECU. On the 99 it should be Plug 135 pin 25. This wire will tap into the Black/Red wires coming off of Plug 135 pin 6, Plug 136 pin 21 and 22.
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Old 05-03-2009, 02:16 PM   #9
Sir Punk
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ok I got to the ECU, I also looked at this page

I see the AT/MT and is the pin that you pointed out. Now, do you know which pins I could remove? there's nothing coming out of 135 pin 6, 136 pin 21 and 22 are red/black as you described. what were you pointing those out?

how do I go about removing a pin, I tried to pull but didn't come out, I just don't wanna break the wire.

also 136 was making a sparkle, I am concerned about that.
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Old 05-03-2009, 04:02 PM   #10
Zephyr
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The 99 does not have a pin at 135 position 6, I was looking at a 00 diagram. You can use any of the wires that run to the TCU. You really need a diagram not just a pinout. There is usually a "lock" that needs to be pulled up or removed on the ECU plug, once that is released you can us a pick to release the pin from the plug.
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