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-- Trouble code P0446 (http://www.escape-central.com/1forum/showthread.php?threadid=32650)


Posted by drumminman on 07-22-2008 01:41 AM:

Trouble code P0446

Does anyone have experience with this?

Problem is supposed to be with the EVAP purge/vent solenoid circuit.

Solutions offered by Autozone OBD II computer are:

1 -Purge or vent solenoids defective

2 -Check connector and wiring

3 -Fuel saturated vapor canister

4 -Failed EVAP vent solenoid

Any tips or how to's greatly appreciated!

2005 Escape V6 4WD Auto, no problems to now and I can't tell any difference in the way it runs since the check engine light came on. I change the oil every 5000 miles (pennzoil platinum w/ mc filter) and just before I do I run a bottle of Techron through the gas tank.

Thanks,

Fred

__________________
drumminman


Posted by fourthmeal on 07-22-2008 05:55 AM:

1. Check Fuel Tank Pressure (FTP) sensor voltage on the scan tool. It should indicate a reading of 2.4-2.8 volts.

2. If the sensor voltage is outside this range, remove the fuel tank cap and check to see if the reading goes back within the range.

3. If the sensor voltage is still outside the range of 2.4-2.8 volts, access the FTP sensor located on top of the fuel tank to check for a circuit or sensor failure.

A. The Brown/White (BR/W) wire provides a 5-volt reference signal to the sensor.

B. The Orange (OG) wire provides a ground to the sensor.

C. The Red/Pink (RD/PK) wire is the sensor signal circuit. This circuit should indicate 5 volts to the sensor with the sensor unplugged when the ignition switch is on from Powertrain Control Module (PCM) pin 62.

4. If the sensor voltage is within range, only after removal of the fuel tank cap, check the Canister Vent (CANV) solenoid and vent line, running away from the carbon canister, for a restriction potentially caused by mud, dirt, spider web, line kink, etc.

5. If voltage is normal when checked in step 1, check for battery voltage to the CANV solenoid at the carbon canister on the Grey/Yellow (GY/YE) wire with the key in the Run position.

6. If the circuit contains battery voltage with the key in the Run position, check the resistance of the solenoid to verify it indicates 48-65 ohms and that the connection is making good contact to the solenoid.

7. Check for battery voltage on the Violet/White (VT/WH) wire of the solenoid with the solenoid connected. This circuit should indicate battery voltage at the solenoid and at PCM pin 67. Service the circuit for an open as necessary.

8. If the CANV solenoid and FTP sensor voltage check out to be OK, start the engine and watch the FTP voltage reading. If the voltage starts to drop when the CANP/VMV solenoid is actuated for the normal canister purge function and steadily decreases, the vent line, carbon canister, or CANV solenoid could also be restricted. Remove the large vacuum line to the canister from the tank and check for the FTP voltage to increase indicating a flow restriction in the canister or by the CANV solenoid.



Most commonly found problem is the wiring at the vent control solenoid is corroded, or broken.

__________________
2008 Mazda Tribute i Touring, Spark Blue.
Head Unit replaced with Pioneer F900BT multimedia / nav deck running Diaftia's mods, connected to a RF 3sixty.2 processor, actively crossed and processed. Alpine SPX-17PRO tweeters, H-Audio Ebony midwoofers. Rock USA RA2.55 running tweeters, Rock USA RA4.55 running mids, and TREO RSX sub amp running Stereo Integrity BM shallow-mount subs all in a false-floor arrangement in the trunk, under the factory cargo cover. Wiring by PG & Knukonceptz, deadening by Sounddeadnershowdown.com

Want to know a lot more about Car Audio? Here's two sites to help you!
http://www.bcae1.com http://www.caraudiobook.com

Came across this site for tire and wheel fitments, Here.


Are you awake and aware in this world? Be ready for the massive changes and enlightenment coming. www.divinecosmos.com


Posted by fourthmeal on 07-23-2008 08:09 PM:

Does this help?

__________________
2008 Mazda Tribute i Touring, Spark Blue.
Head Unit replaced with Pioneer F900BT multimedia / nav deck running Diaftia's mods, connected to a RF 3sixty.2 processor, actively crossed and processed. Alpine SPX-17PRO tweeters, H-Audio Ebony midwoofers. Rock USA RA2.55 running tweeters, Rock USA RA4.55 running mids, and TREO RSX sub amp running Stereo Integrity BM shallow-mount subs all in a false-floor arrangement in the trunk, under the factory cargo cover. Wiring by PG & Knukonceptz, deadening by Sounddeadnershowdown.com

Want to know a lot more about Car Audio? Here's two sites to help you!
http://www.bcae1.com http://www.caraudiobook.com

Came across this site for tire and wheel fitments, Here.


Are you awake and aware in this world? Be ready for the massive changes and enlightenment coming. www.divinecosmos.com


Posted by drumminman on 07-23-2008 08:28 PM:

quote:
Originally posted by fourthmeal
Does this help?


Sorry for the late reply!

Yes, it does. Now I've got to get a manual. I don't know if this is beyond my capability, but I'm going to give it a shot.

If it looks to be too much I'll take it to the shop - or would a dealer be better?

Regards,

Fred

__________________
drumminman


Posted by fourthmeal on 07-23-2008 09:25 PM:

Its always tough recommending where to go. I've been screwed royally by shops that supposedly were quite good. Idiots, they were! The only reason I don't do a lot of work myself is that i don't have a welder, scan tool, lift, or cutting torch, etc. I lack the tools. Knowledge-wise, I've got an edge, and if you want to shop around your area, consider this:

I work for Identifix. I'm a trainer for the program, which is a diagnostic website for techs who are interested in seeing how other people before them have fixed a problem they're having now...just like you are having with the P0446. Given this, in your shoes I would call shops around me, and ask if they use Identifix. If they don't know what that is, I would hang up, and try another. Reason? With our program, we don't have to randomly swap parts until it is fixed. We have test parameters to prove the repair is the right path to take. Hopefully a shop smart enough to use our program (one of a kind in this industry) is capable of dealing with your code issue, and hopefully they will use our info to your advantage. But, then again, that's just me. I don't like how most shops do business.

__________________
2008 Mazda Tribute i Touring, Spark Blue.
Head Unit replaced with Pioneer F900BT multimedia / nav deck running Diaftia's mods, connected to a RF 3sixty.2 processor, actively crossed and processed. Alpine SPX-17PRO tweeters, H-Audio Ebony midwoofers. Rock USA RA2.55 running tweeters, Rock USA RA4.55 running mids, and TREO RSX sub amp running Stereo Integrity BM shallow-mount subs all in a false-floor arrangement in the trunk, under the factory cargo cover. Wiring by PG & Knukonceptz, deadening by Sounddeadnershowdown.com

Want to know a lot more about Car Audio? Here's two sites to help you!
http://www.bcae1.com http://www.caraudiobook.com

Came across this site for tire and wheel fitments, Here.


Are you awake and aware in this world? Be ready for the massive changes and enlightenment coming. www.divinecosmos.com


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