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CEL and codes again.

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Tristicus

Tristicus

Diamond Member
Got the P1443 code on my Mustang still. Used to go on/off, now staying on for some reason. Just took it again for a readout at Advance, said it was the same P1443 code as well as a dealer specific code. I bought http://www.rockauto.com/catalog/raframecatalog.php?carcode=1134201&parttype=5148 a while ago and replaced it (Part CP403), then did the two lines I could access as well. I'm hoping that was the right part to replace as I see there is a solenoid and a valve, but they look the exact same..?

Do I REALLY have to go to a dealer and pay $70+ just to get the damn code read?
 
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I've found plenty of threads on it...unfortunately it is usually a puzzle to get which part it actually is...ordered a sensor anyways...


As for the "dealer code", way to bypass that and get it read?
 
Any decent scanner will read Ford/GM/etc specific codes. Not sure what they mean by "dealer code".

The purge solenoid (or valve, same thing) and flow sensor are two different parts. One is a solenoid that actually opens and controls flow, the other is a sensor that measures flow and provides feedback for the PCM to manage the solenoid and adjust IAC and fueling during EVAP purge.

2009-12-18_140641_purge_flow_sensor.gif


http://www.asashop.org/autoinc/march2002/techtips.htm

[SIZE=-1]The other common code is a P1443. This is due to the PCM not seeing enough flow through the purge flow sensor when the canister purge solenoid is energized[/SIZE]
Click to expand...
This is the flow sensor:
getimage.php


This is the purge valve/solenoid:
getimage.php



I'd replace the flow sensor first and see if resolves the problem, then return the valve. P1443 is caused by the system not flowing what is expected, and it's either because it isn't (problem with valve, harness between valve and PCM, evap hoses/vacuum leaks in the EVAP system) or the sensor reporting incorrectly. It's almost always the sensor (failure mode "low flow"). Something simple like a gas cap would trigger a different code because the sensor would be reporting correctly "high flow".

Valve is easy to test, it's a simple on/off pulse modulated 12v solenoid. No power, shouldn't be able to blow through it. Apply 12 volts in the correct polarity, should be able to blow through it. Use a clean hose instead of sticking it in your mouth directly, and don't inhale 😀
 
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