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p0405 low volts egr circuit, need schematic or experience on 12v feed circuit
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wolfdogg
User
Apr 29, 2011, 12:29 AM
Post #1 of 12
(4327 views)
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p0405 low volts egr circuit, need schematic or experience on 12v feed circuit
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i have a p0405 DTC that is persistent.
its a 2007 chevy equinox 3.4l
i have isolated the problem to what i assume to be the 12v supply wire seems to have a bad connection.
when i meter the supply line it, i reads 11.74 volts, and when i put it under load, ie.. a test light, it drops to 0 volts. i managed to test that i am getting the same scenario on the red wire on the engine control module, which from what i tested is the correct wire that leads to the egr feed. i metered it there on the engine control module, and registered the near 12v, but when i put a test light on it, it cant supply the load, and drops to near 0v.
is this normal behavior for this wire? the reason i used the test light is because i read it in here http://www.obd-codes.com/p0405 , and the reason i mention this is i can see an instance where the amperage capacity of the load from the main cpu might not be delivering that which will power up the test light, but i DOUBT this. so i assume the connection is faulty somewhere previous to this.
what i dont have is the schematic, but i need it. i cant seem to find it online, and the correct images at the autozone.com repair manual arent loading for me currently. what i want to see is where that supply line traces to.
what i havent figured yet is wether the red line i tested on the engine control module is the feed out, or feed in to the module itself. all i can say is if im facing the engine from the front, the module sits on the right side above the battery, and the connector i found the wire in was the left hand connector, as opposed to the right hand connector. maybe somebody knows if this is the feed or not. i can say that the guage of wire was the same so i assume its the output of the module, and the direct feed to the egr 12v hot.
So, where im at now, is im assuming the problem lies either in, or before the engine control module, since i have not yet determined wether i metered the input or output on the module. assuming its the input, then i would assume the supply somewhere presious to this module has a bad connection. i need someone to tell me where all the connectors are that lead up to this from the cpu.
also, i havent found the cpu yet, i guess its near the glovebox. once i find the schematics, and the cpu, i want to meter and test with the test light the output that runs this circuit.
any experience here that might have a tip as a known bad connector, or a symptom of a bad computer module?
(This post was edited by wolfdogg on Apr 29, 2011, 12:30 AM)
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wolfdogg
User
May 2, 2011, 12:45 AM
Post #2 of 12
(4303 views)
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Re: p0405 low volts egr circuit, need schematic or experience on 12v feed circuit
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bump, alot of critiquing my advice going on here, how about a little help?
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Hammer Time
Ultimate Carjunky
/ Moderator
May 2, 2011, 5:19 AM
Post #3 of 12
(4297 views)
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Re: p0405 low volts egr circuit, need schematic or experience on 12v feed circuit
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You're an electronic engineer. What do you need us for?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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zmame
Veteran
/ Moderator
May 2, 2011, 4:28 PM
Post #4 of 12
(4282 views)
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Re: p0405 low volts egr circuit, need schematic or experience on 12v feed circuit
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well one thing i do know if 12v is supplied by a module you don't put it under load with module connected. You will need to isolate the circuit and run a load through the circuit if it can light up a bulb (like 3157 bulb) then the circuit is ok.
I don't have access to diagrams for this vehical.. you will need to buy a haynes manual or pay online though mitchell or somone to get diagrams.
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Mr.scotty
Enthusiast
May 2, 2011, 9:51 PM
Post #5 of 12
(4269 views)
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Re: p0405 low volts egr circuit, need schematic or experience on 12v feed circuit
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I believe Alldeta has a program that you can buy at like autozone that's just for one vehicle.
I forget how much it is though.
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Your only as good as your tools!
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Hammer Time
Ultimate Carjunky
/ Moderator
May 3, 2011, 4:26 AM
Post #6 of 12
(4263 views)
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Re: p0405 low volts egr circuit, need schematic or experience on 12v feed circuit
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Autozone owns Alldata
http://www.alldatadiy.com/
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Mr.scotty
Enthusiast
May 3, 2011, 4:16 PM
Post #7 of 12
(4254 views)
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Re: p0405 low volts egr circuit, need schematic or experience on 12v feed circuit
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I might just buy the one for 5years when i need it.
It'd be much cheaper to do that then the shop one witch is like $170 bucks a month i believe it is.
Is this software much better then say a haynes or chiltons manual?
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Your only as good as your tools!
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zmame
Veteran
/ Moderator
May 3, 2011, 4:21 PM
Post #8 of 12
(4251 views)
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Re: p0405 low volts egr circuit, need schematic or experience on 12v feed circuit
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Diagrams are better through mitchell or alldata vs haynes.. I dont like haynes wiring diagrams.
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Mr.scotty
Enthusiast
May 3, 2011, 4:23 PM
Post #9 of 12
(4250 views)
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Re: p0405 low volts egr circuit, need schematic or experience on 12v feed circuit
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Is mitchell cheaper then Alldeta?
Yeah I don't like haynes diagrams either ( very crappy).
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Your only as good as your tools!
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zmame
Veteran
/ Moderator
May 3, 2011, 4:27 PM
Post #10 of 12
(4247 views)
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Re: p0405 low volts egr circuit, need schematic or experience on 12v feed circuit
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I don't know what there worth.. I don't pay for that stuff I just goto the shop next to ours when I need diagrams.
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Mr.scotty
Enthusiast
May 3, 2011, 4:33 PM
Post #11 of 12
(4243 views)
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Re: p0405 low volts egr circuit, need schematic or experience on 12v feed circuit
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Heh.. lucky you!
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Your only as good as your tools!
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wolfdogg
User
May 11, 2011, 11:16 PM
Post #12 of 12
(4208 views)
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Re: p0405 low volts egr circuit, need schematic or experience on 12v feed circuit
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THANKS FOR THE TIPS GUYS. in this case, i did isolate the circuit, i had to disconnect the egr to test the line.
looks like the pintile sensor is bad, i tested the POT across an ohm meter, and when its pressed in to about 80% of the way, i found that the circuit goes into Open Loop. so looks like thats why the code is stating low volts. its the pintile return circuit.
i needed the schematic, but got some help on that from chevroletforums from somebody else that had the schematic. once i had that, it was all down hill from there.
thanks again.
(This post was edited by Hammer Time on May 12, 2011, 4:24 AM)
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