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  #16  
Old 09-25-2012, 04:02 PM
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Re: Wiring diagrams for 96/OBD2

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Originally Posted by TomsSVX View Post
Closed area network was mandatory for all obdii vehicles. This way all modules associated with powertrain can talk to eachother... take one out and the engine ecu will cry about it

Tom
Are yousure that was true back to 1996? See this link:
http://www.evoscan.com/technical-veh...rea-networking

I have uncovered one difference in the wiring. I had to look at the wiring of a 1997 legacy tcu to find it. The tcu pin that used to run to the power mode light for obd1 models runs to the atf temp light on obd2 models and the pin that used to run to the atf temp light now runs to pin 80 on the obd2 ecu. The tcu sends some sort of diagnostic signal on that line to the ecu but I have no clue what. Could it just be the blinks that used to be sent to the atf temp light on obd1 models? Maybe there is a way to drive that pin on the ecu to make it happy.

As far as I can tell, those are the only lines that may prevent an obd1 tcu from plugging into an obd2 car. Obd2 tcus also monitor the supply voltage on the tps but the obd1 tcu does not and that pin on the obd1 tcus is a NC so it shouldn't matter.
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Tony

1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything
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  #17  
Old 09-26-2012, 12:40 PM
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Re: Wiring diagrams for 96/OBD2

I really want to test the above theory about driving pin 80 in the ECU with a diagnostic waveform equivalent to the "Power Light" flashes one gets in an OBD1 car when you start the engine:

"If a malfunction occurs in any self-diagnosis components, POWER light will flash when engine is started and running for 8 seconds. Power indicator light will come on for 2 seconds and will either signal a self-diagnosis malfunction (blinking for 8 seconds) or okay signal (light will go out). If light does not flash after initial 2 seconds, system is okay. In case of malfunction, trouble code is output as light flashes."

I would like to get a copy of the wiring diagram for a 96 or 97 SVX. All I am working of off now is the wiring diagram of a 97 Legacy and the pinouts of the ECU and TCU for both OBD1 and OBD2 SVXs. Really, I just need to know which of the diagnostic wires from the TCU (B56 pins 11 and 12) go to the ATF Temp warning light and which goes to pin 80 in the ECU.

The waveform probably isn't quite as simple as that power up sequence quoted above but it may not be very different. Maybe the 2 second pulse is the same but the code number is sent after that if there is a problem so that the ECU know what the problem is instead of that there just IS a problem.
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Tony

1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything
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  #18  
Old 09-26-2012, 01:12 PM
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Re: Wiring diagrams for 96/OBD2

Quote:
Originally Posted by Huskymaniac View Post
I would like to get a copy of the wiring diagram for a 96 or 97 SVX. All I am working of off now is the wiring diagram of a 97 Legacy and the pinouts of the ECU and TCU for both OBD1 and OBD2 SVXs. Really, I just need to know which of the diagnostic wires from the TCU (B56 pins 11 and 12) go to the ATF Temp warning light and which goes to pin 80 in the ECU.
If you really want to find some wiring diagrams, this batch of files is a good place to start looking: http://www.subaru-svx.net/forum/showthread.php?t=60472
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project

'97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod

Now a mod "over there" ............Photo album
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  #19  
Old 09-26-2012, 02:40 PM
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Re: Wiring diagrams for 96/OBD2

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Originally Posted by icingdeath88 View Post
If you really want to find some wiring diagrams, this batch of files is a good place to start looking: http://www.subaru-svx.net/forum/showthread.php?t=60472
Those files are for a 1994 (OBD1) car, correct? I need OBD2 wiring diagrams. There are the files from that Russian source. It appears as though MOST of those files are accurate. The ONE exception I have found is the wiring diagram for the TCU. Figures.

But, based on the other diagrams, primarily the ECU ones, I am 99% confident that I was right on my original assumption of the "diagnostic" pins. Connector 55 pin 12 of the OBD2 TCU goes to the ATF temp light and connector 55 pin 11 of the OBD2 TCU goes to pin 80 on the ECU connector. That means that, if an OBD1 TCU were to be used in an OBD2 car, connector 68 (same as 55) pin 11 would have to be swapped with pin 12 as this was the ATF temp light pin for the OBD1 TCU. Also, connector 68 pin 12 would have be non-connected (or connected to a lamp installed elsewhere for power mode indication) and the appropriate diagnostic waveform would need to be sent to ECU pin 80 through TCU connector 55 pin 11.

For people with a 5MT swap in OBD2 cars, if that correct waveform can be determined and sent to pin 80 on the ECU, the CEL would probably not come on for them either.
__________________
Tony

1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything
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  #20  
Old 09-26-2012, 02:52 PM
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icingdeath88 icingdeath88 is offline
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Re: Wiring diagrams for 96/OBD2

Quote:
Originally Posted by Huskymaniac View Post
Those files are for a 1994 (OBD1) car, correct? I need OBD2 wiring diagrams. There are the files from that Russian source. It appears as though MOST of those files are accurate. The ONE exception I have found is the wiring diagram for the TCU. Figures.
Most of the files are for OBD1 cars, but there is also some information for a 97. Worth having a look at least.
__________________
'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project

'97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod

Now a mod "over there" ............Photo album
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