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Old 03-14-2012
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Evap Emission Ctrl System Ctrl Valve

I checked my codes and I got P 1443 Evap system and P 0171 system too lean. I was wondering if these two codes are related, and i dont really know anything about the Evap system.

Thanks, CH
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Old 03-14-2012
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i had this issue. seems like a pretty common one.

http://www.obdii.com/ubb/Forum1/HTML/002192.html
^that kind of sums up what you need to do. i got the 'purge solenoid' at napa. however the p1443 never went away. so i noticed my hoses were dry rotted. i replaced the small hoses in that system and that resolved the problem.
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Old 03-15-2012
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Thanks, i was also wondering if my lean code had anything to do with it because i am more concered with the lean condition.

Thanks, CH
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Old 03-15-2012
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I do not think it has any affect on the lean code, the hoses were junk on a friends evap sytem from intake to canister but did not throw a lean code.

I would clean the MAF sensor and look for a vacuum leak for the lean code.
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Old 03-15-2012
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^yes

also, go ahead and clean the electrical connections up on the purge solenoid and what i believe is called the thermistor (which is the other little dude down line of the solenoid, just incase that is the issue with the p1443. i THINK my truck did randomly throw lean codes every once and a while the p1443 issue was going on...it was a while back
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Old 03-16-2012
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P1443 pretty much means that the purge flow sensor isn't showing the right data for when the evap purge is opening. The purge flow sensor is just a thermistor and measures the temperature change of the air going through it.

When the computer determines its time to open up the purge solenoid it allows 12v to the purge solenoid to open allowing engine vacuum to pull the gas fumes from the evap canister into the intake manifold.

The purge flow sensors measures this flow by sensing the difference in temperatures in the line. The line temp cools as air is being pulled over the sensor, thus the sensor gives data back to the PCM that there IS flow.

I would check the lines, disconnect the solenoid and apply 12v to it to see if it opens. If both of these check out replace the sensor.
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Old 03-17-2012
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some folks have had success in cleaning and/or replacing the purge valve first before the solenoid. in case of replacement try that first because it is the cheaper of the two...
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