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P0443 : what to do with this nightmare ?

  • Thread starter Thread starter shadad
  • Start date Start date Mar 4, 2025
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shadad

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Mar 4, 2025
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Mar 4, 2025
#1
  • Mar 4, 2025
  • #1
Hi there

Can anyone share the diagram wiring of the Canister Purge Valve ? I have replaced like 3 times on one month and still i have ECL on the dashboard with performance issue. i tried to check the fuse 47 but its OK. there is power on the wire socket ( 13 volts at the end yes but the valve is still no click/ stay closed !) . The valves i have i confirmed its working when connect it to the battery.

at this point i suspect a wiring issue/ground somewhere or the PCM is byebye. i want to trace the wire but i sow it going under the body of the car. to where? i dont know.

So, anyone can share the wire diagram so i can trace for electric or ground issue ?
 

Bullitt347

I have been doing it wrong this whole time
15 Year Member
Mar 23, 2007
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Mar 4, 2025
#2
  • Mar 4, 2025
  • #2
Need to do a smoke test of the evap system.
The canister purge valve opens based on a preset system pressure/vacuum.
If the parameters for the purge valve operation are not met, then it will not turn on/off.
The parameters are not being met because it has a leak in the evap system.
 
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shadad

New Member
Mar 4, 2025
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Mar 5, 2025
#3
  • Mar 5, 2025
  • #3
Bullitt347 said:
Need to do a smoke test of the evap system.
The canister purge valve opens based on a preset system pressure/vacuum.
If the parameters for the purge valve operation are not met, then it will not turn on/off.
The parameters are not being met because it has a leak in the evap system.
Click to expand...
Hi,
I can measure 13 volts at Canister Purge Valve wires end beside there is no errors or CEL about leak on the system. previously there was a leak and it was logged p0455. soon i fixed that leak the error gone. even with the leak, i was not losing power or having idle issue at all. it was only MPG issue.

P0443 is what i have and its a circuit condition.​

 

89ripper

Founding Member
Jun 3, 2002
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Rockford, Illinois
Mar 5, 2025
#4
  • Mar 5, 2025
  • #4
What year/engine is this? Below is a link for p0443 possible causes on a 2005 4.6

P0443 — 2005 Ford Mustang V8-4.6L VIN H Service Manual | Operation CHARM

Detailed repair manual for the 2005 Ford Mustang V8-4.6L VIN H.
charm.li
 
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shadad

New Member
Mar 4, 2025
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Mar 11, 2025
#5
  • Mar 11, 2025
  • #5
89ripper said:
What year/engine is this? Below is a link for p0443 possible causes on a 2005 4.6

P0443 — 2005 Ford Mustang V8-4.6L VIN H Service Manual | Operation CHARM

Detailed repair manual for the 2005 Ford Mustang V8-4.6L VIN H.
charm.li
Click to expand...
thank you very much !
it is 2005 Mustang GT . this will really help me a lot.

thank you.
 
S

shadad

New Member
Mar 4, 2025
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Feb 5, 2026
#6
  • Feb 5, 2026
  • #6
Hi all
sorry to post this late. after checking everything and combining the fact that i also have all O2 sensors issues, few months ago, i replaced my PCM and ALL issues got fixed.
the car is running like a horse. .
thank you all and wish my post would help someone on the future.
 
Reactions: gkomo

horse sence

15 Year Member
Nov 29, 1999
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Wile Coyote's stunt double
Feb 5, 2026
#7
  • Feb 5, 2026
  • #7
Is it a aftermarket purge valve? I replaced mine with a doorman valve and it quit working almost instantly . Found a good used one and never had the problem again.
 
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