EGR- Valve

Sebi_Marius · 07-27-2006

Hello to everybody,

I have a problem with EGR valve at my Opel Corsa C 1.2(benzine) and I need a documentation(pdf format eventually) about how this valve work. In the present I guess EGR valve is stucked in "open" position because the engine has a lack of power. I didn't check visual the valve, I mean remove it and see inside, because I did some checks before:
-coil resistance has about 9.5 ohms(so it is ok)
-potentiometer resistance has 3.5Kohms(ok)

So the valve is ok. I measurred the voltage supply at EGR, with connector disconnected and I have only 3.5V instead of 12V(according to the documentation). Where this 12V comes from? This is what I am looking for! It comes from ECU or what?

So this is my problem. If you have some documentation I trully thank you!
Best regards!

gtjames · 07-27-2006

If your EGR was stuck open it would have a hard time ideling. Lacking power would probably be your least concern. Just a heads up. I would probably check your fuel pressure.

Sebi_Marius · 07-28-2006

gtjames, sorry but I don't understand why I should check the fuel pressure. The engine works almost fine, except the lack of power, and the main problem right now is that missing 12V at the connector. I place here a link where you will find what to do before removing and visually inspecting the EGR valve:

http://www.msi-motor-service.com/xim...047_EN_WEB.pdf

So, EGR valve passed the checks. What is wrong is voltage supply to EGR valve(see the document). My voltmeter shows 3.5V between pin5 and ground instead of 12V. So here I have a problem and what I am searching for is a documentation, a wiring diagram where I could see where that voltage comes from...

guyopel · 07-28-2006

Your EGR valve is stuck open because of carbon , this is a common problem . This valve is pulse - modulated to open the valve slowly from full close to full open . I would suggest that you remove the EGR to clean . The signal to the EGR comes from the PCM.HTH

Sebi_Marius · 07-28-2006

Guyopel, the EGR valve is working like it is stucked open but maybe this is its normal position when that voltage is missing. I don't blame carbon residue so quick because, like I said, I don't have 12V on EGR's coil. What is PCM.HTH?

guyopel · 07-28-2006

Open is the not normal position of the EGR . Carbon build up is the most common problem . I would suggest you look
at that first . You are miss diag. the voltage operation of the EGR valve .The PCM is your cars computer .The EGR is not just 12volts on 12volts off. like a simple bulb etc. HTH

Sebi_Marius · 07-28-2006

It is write that the coil should have 12V all the time at pin 5. What close and open the valve is the potential at pin 1, which is "controlled ground". Here, the ECU put a voltage near the value at pin 5 or not. This is how I understood it works!

guyopel · 07-28-2006

Sorry but you have it wrong .

Sebi_Marius · 07-31-2006

I solved my problem putting directly 12V on EGR' s coil. Somehow I guess I forced it to unstuck. Now the engine is "breathing" nice

alpharm · 09-28-2006

Try in the future to look for "clean" fuel in the gas stations.
For the EGR the main damage is caused because of this

07-27-2006	#1 (permalink)
Sebi_Marius Opeler Join Date: Jul 2006 Location: Romania Posts: 5	Unanswered: EGR- Valve Hello to everybody, I have a problem with EGR valve at my Opel Corsa C 1.2(benzine) and I need a documentation(pdf format eventually) about how this valve work. In the present I guess EGR valve is stucked in "open" position because the engine has a lack of power. I didn't check visual the valve, I mean remove it and see inside, because I did some checks before: -coil resistance has about 9.5 ohms(so it is ok) -potentiometer resistance has 3.5Kohms(ok) So the valve is ok. I measurred the voltage supply at EGR, with connector disconnected and I have only 3.5V instead of 12V(according to the documentation). Where this 12V comes from? This is what I am looking for! It comes from ECU or what? So this is my problem. If you have some documentation I trully thank you! Best regards! Last edited by Sebi_Marius; 07-27-2006 at 10:26 AM.

07-27-2006	#2 (permalink)
gtjames Member Join Date: Aug 2005 Location: Bonney Lake, WA Posts: 137	egr? If your EGR was stuck open it would have a hard time ideling. Lacking power would probably be your least concern. Just a heads up. I would probably check your fuel pressure. __________________ Don't believe everything you think. Last edited by gtjames; 07-27-2006 at 09:01 PM.

07-28-2006	#4 (permalink)
guyopel Member Join Date: Feb 2003 Location: Duluth,Ga. Posts: 649 Real Name: John Provided Answers: 2	Your EGR valve is stuck open because of carbon , this is a common problem . This valve is pulse - modulated to open the valve slowly from full close to full open . I would suggest that you remove the EGR to clean . The signal to the EGR comes from the PCM.HTH __________________ Guyopel I have not failed - I've merely found 10,000 ways that won't work." ---Thomas Edison It's amazing what God lets man get away with when lightning is so cheap. Mark Twain

07-28-2006	#5 (permalink)
Sebi_Marius Opeler Join Date: Jul 2006 Location: Romania Posts: 5	Guyopel, the EGR valve is working like it is stucked open but maybe this is its normal position when that voltage is missing. I don't blame carbon residue so quick because, like I said, I don't have 12V on EGR's coil. What is PCM.HTH? Last edited by Sebi_Marius; 07-28-2006 at 10:02 AM.

07-28-2006	#6 (permalink)
guyopel Member Join Date: Feb 2003 Location: Duluth,Ga. Posts: 649 Real Name: John Provided Answers: 2	Open is the not normal position of the EGR . Carbon build up is the most common problem . I would suggest you look at that first . You are miss diag. the voltage operation of the EGR valve .The PCM is your cars computer .The EGR is not just 12volts on 12volts off. like a simple bulb etc. HTH __________________ Guyopel I have not failed - I've merely found 10,000 ways that won't work." ---Thomas Edison It's amazing what God lets man get away with when lightning is so cheap. Mark Twain

07-28-2006	#3 (permalink)
Sebi_Marius Opeler Join Date: Jul 2006 Location: Romania Posts: 5	gtjames, sorry but I don't understand why I should check the fuel pressure. The engine works almost fine, except the lack of power, and the main problem right now is that missing 12V at the connector. I place here a link where you will find what to do before removing and visually inspecting the EGR valve: http://www.msi-motor-service.com/xim...047_EN_WEB.pdf So, EGR valve passed the checks. What is wrong is voltage supply to EGR valve(see the document). My voltmeter shows 3.5V between pin5 and ground instead of 12V. So here I have a problem and what I am searching for is a documentation, a wiring diagram where I could see where that voltage comes from...

07-28-2006	#7 (permalink)
Sebi_Marius Opeler Join Date: Jul 2006 Location: Romania Posts: 5	It is write that the coil should have 12V all the time at pin 5. What close and open the valve is the potential at pin 1, which is "controlled ground". Here, the ECU put a voltage near the value at pin 5 or not. This is how I understood it works!

07-28-2006	#8 (permalink)
guyopel Member Join Date: Feb 2003 Location: Duluth,Ga. Posts: 649 Real Name: John Provided Answers: 2	Sorry but you have it wrong . __________________ Guyopel I have not failed - I've merely found 10,000 ways that won't work." ---Thomas Edison It's amazing what God lets man get away with when lightning is so cheap. Mark Twain

07-31-2006	#9 (permalink)
Sebi_Marius Opeler Join Date: Jul 2006 Location: Romania Posts: 5	I solved my problem putting directly 12V on EGR' s coil. Somehow I guess I forced it to unstuck. Now the engine is "breathing" nice

09-28-2006	#10 (permalink)
alpharm OPEL PARTS GREECE Join Date: Apr 2005 Location: GREECE Posts: 140	Try in the future to look for "clean" fuel in the gas stations. For the EGR the main damage is caused because of this

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