P1445 DTC
#1
P1445 DTC
I am getting this code, canister purge volume control valve.
I checked and I am getting battery voltage at the harness pins 2 and 5 to ground. removed the hoses, turned ignition on and off, can see and hear the stepper motor moving. Seems to be smooth, can here the click, click, click as it adjusts.
Get 30 ohms between 2 and 1/3 and 5 and 4. 5 to 6 is 50 ohms. Does that neccessarily mean it is bad?
I checked the canister purge control valve, and if I blow into the B port air comes out the C port, with no vacuum on A. I assume that means it is bad? If I apply vacuum it flows better, with no vacuum it leaks. Looks like it s $70 +/-.
I checked and I am getting battery voltage at the harness pins 2 and 5 to ground. removed the hoses, turned ignition on and off, can see and hear the stepper motor moving. Seems to be smooth, can here the click, click, click as it adjusts.
Get 30 ohms between 2 and 1/3 and 5 and 4. 5 to 6 is 50 ohms. Does that neccessarily mean it is bad?
I checked the canister purge control valve, and if I blow into the B port air comes out the C port, with no vacuum on A. I assume that means it is bad? If I apply vacuum it flows better, with no vacuum it leaks. Looks like it s $70 +/-.
#2
I was getting P1445 and sometimes P1777. When I took the EVAP canister purge volume control valve off the car, I could shake little black particles out of it. The particles were also in the EVAP canister purge control valve, but no surprise since the two are connected together.
Turns out the particles were from the EVAP canister which uses carbon to filter the fumes from the gas tank. The carbon particles aren't supposed to come out of the canister but they were getting in the valves and preventing them from working correctly.
So pull off one of the two valves and see if you have particles in them. If you do, besides replacing the charcoal canister, you will have to blow out the metal tube that runs from the canister in the rear to the volume control valve (the one you sested) as well. The EVAP canister is behind the driver's side rear wheel and was only about $35 from the dealer.
Turns out the particles were from the EVAP canister which uses carbon to filter the fumes from the gas tank. The carbon particles aren't supposed to come out of the canister but they were getting in the valves and preventing them from working correctly.
So pull off one of the two valves and see if you have particles in them. If you do, besides replacing the charcoal canister, you will have to blow out the metal tube that runs from the canister in the rear to the volume control valve (the one you sested) as well. The EVAP canister is behind the driver's side rear wheel and was only about $35 from the dealer.
#4
I am getting this code, canister purge volume control valve.
I checked and I am getting battery voltage at the harness pins 2 and 5 to ground. removed the hoses, turned ignition on and off, can see and hear the stepper motor moving. Seems to be smooth, can here the click, click, click as it adjusts.
Get 30 ohms between 2 and 1/3 and 5 and 4. 5 to 6 is 50 ohms. Does that neccessarily mean it is bad?
I checked the canister purge control valve, and if I blow into the B port air comes out the C port, with no vacuum on A. I assume that means it is bad? If I apply vacuum it flows better, with no vacuum it leaks. Looks like it s $70 +/-.
I checked and I am getting battery voltage at the harness pins 2 and 5 to ground. removed the hoses, turned ignition on and off, can see and hear the stepper motor moving. Seems to be smooth, can here the click, click, click as it adjusts.
Get 30 ohms between 2 and 1/3 and 5 and 4. 5 to 6 is 50 ohms. Does that neccessarily mean it is bad?
I checked the canister purge control valve, and if I blow into the B port air comes out the C port, with no vacuum on A. I assume that means it is bad? If I apply vacuum it flows better, with no vacuum it leaks. Looks like it s $70 +/-.
#5
See attached diagram. When you first turn the ignition on, you should be able to hear it moving, for few seconds.
I replaced the valve that controls it (Purge cut valve in this diagram), and for now my light is off...
Probably just jinksed myself.
I replaced the valve that controls it (Purge cut valve in this diagram), and for now my light is off...
Probably just jinksed myself.
#6
Do you know which of two systems from diagram was used when? I am chasing an EVAP issue (gettting a P0446 code) and trying to figure out what to replace first.
#7
Mine is a 96 and figure 2 applies to it. I think Figure 2 is 96 and later.
You guys might want to find the FSM for your year on this site and download it. I did that several years ago, not sure where it is or the link to it.
The links are in Fallenone's signature:
http://forums.maxima.org/member.php?u=81096
You guys might want to find the FSM for your year on this site and download it. I did that several years ago, not sure where it is or the link to it.
The links are in Fallenone's signature:
http://forums.maxima.org/member.php?u=81096
Last edited by sparky1562; 02-15-2011 at 08:44 AM. Reason: added link
#8
Still have code
Well, I still have the code.
No charcoal in the lines, the stepper motor moves just fine. What do I check next???
With the code cleared, I get vacuum on the control valve, get vacuum on the line from the canister through the control valve, through the stepper valve. When the code sets, no vacuum on the control valve.
I'm stumped. If the stepper valve is working (IE: it moves) can it still not be working correctly and throw the code?
Checked the harness, continuity to the ECM, no problems found.
No charcoal in the lines, the stepper motor moves just fine. What do I check next???
With the code cleared, I get vacuum on the control valve, get vacuum on the line from the canister through the control valve, through the stepper valve. When the code sets, no vacuum on the control valve.
I'm stumped. If the stepper valve is working (IE: it moves) can it still not be working correctly and throw the code?
Checked the harness, continuity to the ECM, no problems found.
Last edited by sparky1562; 02-24-2011 at 04:55 PM. Reason: added info.
#9
Well, I still have the code.
No charcoal in the lines, the stepper motor moves just fine. What do I check next???
With the code cleared, I get vacuum on the control valve, get vacuum on the line from the canister through the control valve, through the stepper valve. When the code sets, no vacuum on the control valve.
I'm stumped. If the stepper valve is working (IE: it moves) can it still not be working correctly and throw the code?
Checked the harness, continuity to the ECM, no problems found.
No charcoal in the lines, the stepper motor moves just fine. What do I check next???
With the code cleared, I get vacuum on the control valve, get vacuum on the line from the canister through the control valve, through the stepper valve. When the code sets, no vacuum on the control valve.
I'm stumped. If the stepper valve is working (IE: it moves) can it still not be working correctly and throw the code?
Checked the harness, continuity to the ECM, no problems found.
#11
Follow up
Even though the purge volume control valve checked out okay, and moved when it was supposed to, I finally went to the salvage yard and got a used unit for $8. Put it on, the code is gone.
#13
if any one has the factory specs on testing all the evap components i would appreciate it thanks.i went to Nissan bough a evap vol control valve $115, put it on did not fix the problem
Last edited by willbur; 08-28-2011 at 09:58 AM.
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4th Generation Maxima (1995-1999)
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