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Old 03-17-2005, 12:44 AM   #1
Costas
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Default P1596 Automatic transmission diagnosis input signal circuit high input

Well, I fixed the fuel temp sensor circuit- only to have this thing come up...anyone now what could be the cause?

Car is a 99 RS/03 2.0 WRX engine. (manual)


Just need to make this code go bye bye- are the automatic WRX ECUs a bit different? My concern is that I may have one of them.

Thanks!
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Old 03-18-2005, 03:23 PM   #2
Zephyr
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Yes they are different as they have a few extra pins that go to the TCU. Try switching ECM's with someone who has a stock WRX and see if it goes away.

Z
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Old 03-18-2005, 03:40 PM   #3
Costas
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Spoke to Dave about this, when we looked at the wiring schematics and manual, that was what was suggested. Although this code wasnt present before (Actually had a fuel temp sensor code, and that was fixed) perhaps something was jiggled while we were tooling around there as this code was not present before the "fix" for the fuel temp
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Old 06-28-2008, 05:48 PM   #4
mannac
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bump


I have this code right now after my swap. It came on after I fueled up after putting about 20 miles on this car.

I swapped an 02 wrx engine into an 02 ts. My car is a manual and I know that the ecu is from an automatic but is there a way I can fix this regardless? I heard this has happened on cars with manuals and the problem was the connector or a bad ground. The tranny connectors are in good shape and I wouldn't know where to start with grounds

I have a feeling if I erase this, it will come back again after a little driving and always be on so I won't know if there's a real problem with my car unless I scan it every so often. Any input would be great

Did the whole swap and this is the only code I got. Man am I in a good mood
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Old 06-30-2008, 02:39 PM   #5
Zephyr
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Simple solution. You need to add one wire to plug B136. It needs to go in pin 1 on that plug. You then need to splice it into the BR wire that comes off of B134 pins 7 and 15. This will solve your problem. Shoot me a PM if you need any more help.

Z
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Old 07-01-2008, 10:24 PM   #6
mannac
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Quote:
Originally Posted by Zephyr View Post
Simple solution. You need to add one wire to plug B136. It needs to go in pin 1 on that plug. You then need to splice it into the BR wire that comes off of B134 pins 7 and 15. This will solve your problem. Shoot me a PM if you need any more help.

Z
alright, thanks!

I'll have to do this sometime this month. For now, I just want to enjoy my 6 months of work
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Old 07-02-2008, 04:18 PM   #7
ciper
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Quote:
Originally Posted by Zephyr View Post
Simple solution. You need to add one wire to plug B136. It needs to go in pin 1 on that plug. You then need to splice it into the BR wire that comes off of B134 pins 7 and 15. This will solve your problem. Shoot me a PM if you need any more help.
Could you explain what the missing signal was and what each of those pins are originally intended for?
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Old 07-02-2008, 04:38 PM   #8
Zephyr
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B136 pin 1, B134 pin 7 and 15 are all grounds. On the automatic harness pin 1 on B136 is no present.
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Old 01-04-2012, 02:53 PM   #9
Johnnyp510
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Quote:
Originally Posted by Zephyr View Post
Simple solution. You need to add one wire to plug B136. It needs to go in pin 1 on that plug. You then need to splice it into the BR wire that comes off of B134 pins 7 and 15. This will solve your problem. Shoot me a PM if you need any more help.

Z
I bought an auto impreza wrx no engine and tranny. Dropped a stick trans and engine out of wagon wrx. Swaped ECM getting p1596, and did wire add advise. No work. Everyone who has this problem says I'm missing a ground. I'm not seeing it any input?
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Old 01-04-2012, 06:41 PM   #10
Zephyr
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What else have you done electrically to the car to make it all work? what are you doing for your VSS, Neutral and reverse lights? Have you removed the dropping resistor and other AT specicfic items? Are you still using an AT bulkhead harness?
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Old 01-04-2012, 11:22 PM   #11
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Quote:
Originally Posted by Zephyr View Post
What else have you done electrically to the car to make it all work? what are you doing for your VSS, Neutral and reverse lights? Have you removed the dropping resistor and other AT specicfic items? Are you still using an AT bulkhead harness?
Yes still using auto bulk head have stick bulk head avoiding that procedure if I can. I've wired vSS from to stick trans to connector at ECM 2 wires third wire to fused power. Start and reverse lights go through auto jump harness that would normal pug into inhibitor switch. Also had to disconnect green with yellow wire at tcm ( vss input) Used in auto but causes speedo to drop out at 14 mph and make oil temp light flash. Nothing done with dropping resistor? Didn't even know about that, or what it's purpose is. Using ECM from car that donated engine and trans. Tried cluster from doner car and cluster from car I'm building. Tried some other things with no success. Not positive but pretty sure something not crossing between stick and auto conversion, p1596 sets pending with in a minute of car running, no drivabilitys associated with code can't get nystate inspection cause of it.
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Old 01-06-2012, 10:21 PM   #12
grkimpreza
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i have an 02 2.5rs and i to had p1596 but ground the br/r wire comeing off of b135 connector pin 4 but now getting a p1595 low input going to try and look tomorrow to fix it
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Old 05-16-2016, 06:13 PM   #13
gm2
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Digging this thread up since it's one of the few references to DTC P1596 and using an auto ECU in a swap. This problem caused me a few days of annoyance and I'd like to correct the information above to help others.

Zephyr was close, but called out the wrong plug in his response to the OP.

B84/1 needs to be pinned and attached to ground. (Connected to B134/7 or B134/15) - This tells the computer the car is a manual.

This connection is not present on the ECU pinout diagram, but is subtly listed on the Engine Electrical System diagram.
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Old Yesterday, 01:57 PM   #14
vascorama
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Hi gm2, can you please post a pic or schematics for this? I have the same problem and im not an electrician, im afraid of doing something wrong if i dont have a diagram. Thanks in advance.
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