[silver sl]

I have a problem I hope someone can help me with. I took my 2008 Nissan Frontier to Auto zone for a check engine lite told me my canister purge valve is bad took my truck home took the valve off put a OHM meter across the terminals and it read good 240 ohms no open when I checked the wire going to the solenoid there is no voltage with the key on and the truck started is it a fuse bad and if it is where is it engine comp glove box and what name would it have or is it getting its power somewhere else called a Nissan dealer and thy won't say HELP !!!!

 

[Skibane]

The Canister Purge Valve is controlled by the Engine Computer Module (ECM) - That's where it gets its DC power from.

The ECM rapidly cycles the valve on and off, depending on various driving conditions - It doesn't simply stay "on"all the time the ignition switch is on.

The fact that you're still measuring some resistance across the valve's coil doesn't necessarily mean that the valve is good - For example, the coil would still show normal resistance even if the valve was stuck open or closed.

The Engine Control System chapter in your factory service manual describes how the valve works, and what each trouble code affecting it means.

If you don't have a factory service manual yet, consider downloading one - It'll eliminate a lot of guesswork in troubleshooting these kinds of things.

 

[silver sl]

thanks is there any way to test the solenoid if I get 12 volts off the battery red wire pos. gray neg. see if air passes through and where can I download the service manual for my 2008 frounter

 

[Skibane]

You can download the Factory Service Manual from this page.

As described in the Service Manual, here's how to test the valve:

 

[silver sl]

Thank you very much, you help was greatly appreciated I put 12 volt across the terminals the valve opens and closes put some WD to clean the valve put it back together disconnected the battery to reset the computer light is out took it for a ride and so far no problems and thank you for the service manual all I have to do is figure how to use the letter codes

 

[c_irie]

thank you for the service manual all I have to do is figure how to use the letter codes

Download the fwd file first that will tell you the abbreviations of the chapters

 

[silver sl]

code po477

I posted about no 12 volts to the purge valve bought a new valve reset the service engine light 36 miles later the light is back on obd reads purge valve open circuit now what

 

[Skibane]

"Open Circuit" means that the ECM is measuring an open circuit in its connection to the valve's coil.

Basically, the ECM occasionally measures the resistance of that circuit (along with a lot of other circuits), and sets an error code if the resistance isn't within the range of resistances that the ECM considers to be OK.

If the measured resistance is too high, you get an "Open Circuit" error code. If it's too low, you'll get something like a "Short Circuit" code.

Since you already know that the valve itself is good, you've probably got a break in one of the wires or connectors somewhere between it and the ECM.

 

[silver sl]

is there a schematic of the wiring diagram to show me where that wire goes instead of ripping apart the wire harness and I cant find the index for the service manual and I want to thank you very much for helping me

 

[dkcase]

is there a schematic of the wiring diagram to show me where that wire goes instead of ripping apart the wire harness and I cant find the index for the service manual and I want to thank you very much for helping me

See the post from c-irie above. The abbreviations are shown in the file FWD.pdf.