Honda Civic VX failed NOx, EGR system not working

[villa92vx]

Smog check #s
15 MPH, RPM 2362, %CO2 14.5, %O2 0.8, HC (PPM) 10, CO (%) 0.00, NO (PPM) 24,=pass
25 MPG, RPM 2197, %CO2 9.9, %O2 6.8, HC (PPM) 19, CO(%) 0.00, NO (PPM) 1415. =Fail
ECU # 37820-P07-A00
This is the third test.
Connected a milti meter to wires controling solinoid valve , and it only gets a 12v signal only after rpm is between 3400-3800.
Milles on car is 193xxx.
Rancho vx you said somthing about egr passeges clogged ,what is the remedy for this .
And thank you all for your assistance.

[92VX]

I believe your EGR singal and valve is working just fine. You turn the EGR on by grounding it, not sending 12 volts to it. I seriously think you would get a code if it wasn't. That doesn't mean that the EGR passages in the intake are not blocked, the ECU can't detect that problem. Even if they are partially blocked, you'll have problems. The entire path needs to be clean. Here's a link to cleaning them.

http://home.comcast.net/~em-engineering/T2T013.pdf

[GasSavers_RoadWarrior]

What was the HC like on the first test?

[suspendedhatch]

Yes I can confirm that it will throw a code for EGR. You can unplug it at the distributor and see for yourself.

It is extremely common among all makes and models of cars that have EGR for them to get clogged periodically. I'm a smog inspector and I see this several times a day.