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Old 04-03-2017, 09:46 AM   #1
ImprezaJoe
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Join Date: May 2011
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2003 Impreza WRX
Sonic Yellow

Default P0246 - At a loss

My 03 wrx threw a P0246 a while back causing it to boost to wastegate pressure but no more. On this forum I read some older posts by a guy named Broxma who had the same issue and determined it was the switching mechanism in his ecu that shorted. He fixed it by replacing the ecu. Well I replaced my ecu with another 03 wrx ecu and now this one has thrown a P0246 code. I've checked and double checked the wiring to my 3 port ebcs (mac valve) and determined that is not the problem. I've also used a multimeter to check voltages (and referenced Broxma's thread to make sure I've got the right numbers) and everything checked out. I'm at a loss. My car seems to be eating ecu's and I can't seem to figure out the short.

Has anyone else had experience with this CEL?
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Old 04-05-2017, 10:52 AM   #2
Charlie-III
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Default

Did the issues start when the new valve was installed?
If yes, maybe the wiring is wrong.
If no, check the wiring to see if it has a short in it.

Sounds like a wiring issue or short that is taking out ECU's.
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Old 04-07-2017, 09:19 AM   #3
ImprezaJoe
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2003 Impreza WRX
Sonic Yellow

Default

I used this thread as a reference:https://forums.nasioc.com/forums/sho....php?t=1346749

The issue appeared before I wired in my 3 port ebcs. I bought the 3 port thinking my stock bcs was shot but it turns out that wasn't the case. I stumbled upon the referenced thread and purchased another ecu to fix the problem (2/21/17). That worked fine until recently when it threw the same code. I bought a 3rd ecu and installed it yesterday, but immediately threw the code upon hitting boost. Car still boosts to wastegate 7 psi. I know for a fact it is an electrical issue because I overboost to the moon if I unplug the vac hose to the wastegate.

My thoughts are that I've got a short between the BCS and the ecu that is making it return a much higher voltage than what is "acceptable" to the ecu. I think that is the cause of my 3 fried ecus. I checked the power wire (yellow/blue) to the BCS and found the reading to be about 12.3-12.5 volts with the key in the ON position.

I tried to run the ground from the BCS to a chassis ground without using the ecu ground wire but it threw the p0246 code upon turning the car on (before I even drive or hit boost). I'm no EE but I think that means the ECU is looking for a return voltage to either enable or disable the BCS.

I'll be chasing the ground wire this weekend to determine if my issue is grounding related. Because of all the headache this issue has given me I plan to continue documenting my tests/findings and hopefully post a final solution to this code.

Joe

Last edited by ImprezaJoe; 04-07-2017 at 01:13 PM. Reason: proofreading
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