Originally Posted by
pizzaguy
How many miles on the car? THat code is most usually an indication of little or no flow. WHat did the passages look like when you change the valve?
Is there 12 volts on one pin? If the ECU is telling it to open, you will have 12 volts on one side and zero on the other. IF you have zero on both sides, the B+ feed to it is not there, ya gotta fix that.
If you have 12 on both sides, you have good power but the ECU (at that particular time) is not asking it to open.
Thanks for the reply.
I'm at 119,000 miles.
The passages were dirty but nowhere near being clogged. I cleaned them out before reassembly.
I haven't measured any voltages yet. From the manual, pin 2 is connected to the RCM (should be 12V at all times, I assume) and pin 1 is connected to the PCM. I assume that pin 1 would go to ground to activate the solenoid. Is this correct? I have no idea how to know when it would be set to be open (when the EGR valve was active or not).
I'll verify that pin 2 has 12V. Meanwhile, what is the B+ feed?
Thank you!
Pg 9350, P0400 EGR system performance, diagnostics