tuning help! - Subaru Enthusiasts Car Club of the Sierras

koobaru · 2009-04-15, 07:59 PM

so, today, knucklesplitter came to reflash my ecu via opensource. well we ran into this error where it kept saying that the programming voltage was too low. it was reading something like 4 volts without the jumper connector connected, and like 1. something when it was connected. when he would do a test write, it completed with no problems, then, when he tried to actually write to the ecu, ERROR anyone know whats up with this?

Dean · 2009-04-15, 08:10 PM

I think the data cable may be missing the flash pin or it is not making good contact for some reason.

I assume your car battery is fully charged.

sperry · 2009-04-15, 10:05 PM

You have a 2002 wrx, don't you? It's a known bug w/ the '02 ecu.

There are all sorts of posts about it on the open source tuning forums. One partial solution is to supply 12v straigt from the battery to the jumper, but even that is inconsistant. I actually built a circuit with a potentiometer in it to be able to tweak the voltage to get mine to work.

I wish Matt has mentioned what he was working on when he borrowed my cable, I would have explained what's up with the 02 ecu!

koobaru · 2009-04-16, 06:14 AM

ok, so i looked up on openecu.org forums. there is an older thread where they were talking about jumpering 12v from battery to some pin, or the jumper block. then they said the "correct" side of the jumper block. its not very clear. can someone clarify?

renosubby · 2009-04-16, 02:30 PM

http://www.tactrix.com/images/0203_W...ector_smwm.JPG
there you go..
I have one BTW

100_Percent_Juice · 2009-04-16, 02:55 PM

^Did you ever get that Evo tuned?

renosubby · 2009-04-16, 03:31 PM

Quote:

Originally Posted by 100_Percent_Juice

^Did you ever get that Evo tuned?

I actually tune now... so it is tuned...LOL

sperry · 2009-04-16, 05:56 PM

Quote:

Originally Posted by renosubby

http://www.tactrix.com/images/0203_W...ector_smwm.JPG
there you go..
I have one BTW

That doesn't supply power from the battery to correct the 02 ecu issue. Using that is what causes the improper voltage errors.

Unfortunately, I don't remember off hand which pin you apply the voltage to (and I'm out of town right now so I can't go look), but I'm pretty sure you can just try both pins until it works since one pin is the input and the other pin is supposed to be 12v anyway.

If putting 12v to the jumper results in an over voltage error, you can try turning the lights on or running the a/c fans. And if that's still not enough, you can add a resistor to the line, which it what I did with that pot so I could adjust it until it works.

Or you can just get an 03 ecu that doesn't put out the incorrect voltage to the jumper to begin with.

koobaru · 2009-04-16, 06:05 PM

tune is complete, well almost. anyway, i just made a jumper and we got it done. thanks guys.

knucklesplitter · 2009-04-16, 09:30 PM

We installed the Subaru jumper plug (just like the Tactrix one) and then applied raw battery voltage from the battery terminal to a t-pin stuck into the jumper plug. It flashed on the first try after that. Kinda a PITA.

2009-04-15, 07:59 PM	#1
koobaru EJ18 Join Date: Feb 2009 Location: sparks Posts: 40 Car: 2002 wrx hybrid	tuning help! so, today, knucklesplitter came to reflash my ecu via opensource. well we ran into this error where it kept saying that the programming voltage was too low. it was reading something like 4 volts without the jumper connector connected, and like 1. something when it was connected. when he would do a test write, it completed with no problems, then, when he tried to actually write to the ecu, ERROR anyone know whats up with this?

2009-04-15, 08:10 PM	#2
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	I think the data cable may be missing the flash pin or it is not making good contact for some reason. I assume your car battery is fully charged. __________________ I am a Commodore PET --- Now get off my lawn you kids...

2009-04-15, 10:05 PM	#3
sperry The Doink Real Name: Scott Join Date: Nov 2002 Location: Portland, OR Posts: 20,335 Car: '09 OBXT, '02 WRX, '96 Miata Class: PDX/TT-6 The way out is through	You have a 2002 wrx, don't you? It's a known bug w/ the '02 ecu. There are all sorts of posts about it on the open source tuning forums. One partial solution is to supply 12v straigt from the battery to the jumper, but even that is inconsistant. I actually built a circuit with a potentiometer in it to be able to tweak the voltage to get mine to work. I wish Matt has mentioned what he was working on when he borrowed my cable, I would have explained what's up with the 02 ecu! __________________ Is you is, or is you ain't, my con-stit-u-ints?

2009-04-16, 02:30 PM	#5
renosubby RIP Real Name: Cory Schander Join Date: Oct 2007 Location: Reno, NV Posts: 163 Car: 2006 STI Class: SM Never dwell on the past, It fucks your future!	http://www.tactrix.com/images/0203_W...ector_smwm.JPG there you go.. I have one BTW __________________ *MAYHEM TUNING* 2006 CGM STI 570WHP 539WTQ 10.6 At 136MPH Sacramento

2009-04-16, 02:55 PM	#6
100_Percent_Juice (40 percent vodka) Real Name: Joel Join Date: Oct 2006 Location: Reno, NV Posts: 4,446 Car: 2004WRX Class: Baby-Hauler/GroceryGetter	^Did you ever get that Evo tuned? __________________ "A power nap is when you sleep on someone who is weaker than you." - Dimitri Martin

2009-04-16, 06:14 AM	#4
koobaru EJ18 Join Date: Feb 2009 Location: sparks Posts: 40 Car: 2002 wrx hybrid	ok, so i looked up on openecu.org forums. there is an older thread where they were talking about jumpering 12v from battery to some pin, or the jumper block. then they said the "correct" side of the jumper block. its not very clear. can someone clarify?

2009-04-16, 06:05 PM	#9
koobaru EJ18 Join Date: Feb 2009 Location: sparks Posts: 40 Car: 2002 wrx hybrid	tune is complete, well almost. anyway, i just made a jumper and we got it done. thanks guys.

2009-04-16, 09:30 PM	#10
knucklesplitter EJ205 Real Name: Matt Taylor Join Date: Jun 2005 Location: Cousin-Fck, Carolina Posts: 1,475 Wish in one hand and sht in the other...	We installed the Subaru jumper plug (just like the Tactrix one) and then applied raw battery voltage from the battery terminal to a t-pin stuck into the jumper plug. It flashed on the first try after that. Kinda a PITA.

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