Hi everyone, sorry for my first post to be one begging for info but I have searched the internet for days and I keep coming up with the same web pages.
My problem is the EGR valve, yes I know all about the blanking and cleaning, I did all that but found the car to be worse so I suspect the inlet manifold is in need of changing.
But to my current problem, I have installed a brand new GM EGR valve and yet I still get the same error code "P0400 - Exhaust Gas Recirculation Circuit Open
(04) - Present"
So I checked the connection and there is 4 connectors on the socket but only 2 on the EGR, the top two connectors have power and earth constant to them, the ones that connect to the EGR only has constant earth, the power one seems dead. Is there a fuse or relay that controls the EGR valve, or does the power come on at a specific time as I cannot get rid of this fault code.
I have ran diagnostic on the old and new valves, even put some power to the old one and the valve went in and out when I turned the 12v power supply on and off, so I know the old EGR valve works, but yet it doesn't seem to be getting any power to it. I have checked the cables as far as I can trace them and cannot find any breaks in them.
Any help or advice would be appreciated as it is driving me mad, I want to fix this before I strip down the engine to do the inlet manifold.
Many thanks in advance