P0443 : what to do with this nightmare ?
Thread Starter
Joined: Jun 2011
Posts: 17
From: Doha
P0443 : what to do with this nightmare ?
Hi there,
I was having issue with my Mustang GT 2005 recently and the check engine kept flashing with rough idle for about 20 sec then it goes away. No issue at driving after that or at stopping.
After checking the code i come to know that its the P0443. I though Okaaa! this is easy fix for the Purge valve. So, i replaced mine and still have the issue P0443. i decided to connect the old unit i thought went bad to the battery and it kick! i returned it back to its location then turn on the car and it didn't kick (old and new )! also the new did the same thing. i have measure the voltage at the battery when i connect it and record a 13.34 Volts but the power socket of the valve where it connect i record around 13.08-13.11 volts. is this normal ? i mean is mere 0.11 volts could make different here? or both units ( old and the new one ) are bad and they should've function even at lower voltage ?
should i go and order 2nd one?
I was having issue with my Mustang GT 2005 recently and the check engine kept flashing with rough idle for about 20 sec then it goes away. No issue at driving after that or at stopping.
After checking the code i come to know that its the P0443. I though Okaaa! this is easy fix for the Purge valve. So, i replaced mine and still have the issue P0443. i decided to connect the old unit i thought went bad to the battery and it kick! i returned it back to its location then turn on the car and it didn't kick (old and new )! also the new did the same thing. i have measure the voltage at the battery when i connect it and record a 13.34 Volts but the power socket of the valve where it connect i record around 13.08-13.11 volts. is this normal ? i mean is mere 0.11 volts could make different here? or both units ( old and the new one ) are bad and they should've function even at lower voltage ?
should i go and order 2nd one?
Thread Starter
Joined: Jun 2011
Posts: 17
From: Doha
I want to add this to my story above,
I have limited knowledge about electricity but for sure 100% it was closed circle. I can measure around 13.01 Volts on the wire socket harness that goes to the Purge valve. i just bought a 9 Volt battery from the shop to confirm that even with low V it will work and it did! the valve open and clicked. so why when i hock its wire socket harness that has 13.01 volts its not jump or open! this is crazy
.
so to summarized my story its like this :
Purge valve connecting directly to car battery = OK
Purge valve connecting to 9 volt battery = OK
Purge valve connecting to its harness that has 13 volts = Fail/ no click/ stay closed !
I have limited knowledge about electricity but for sure 100% it was closed circle. I can measure around 13.01 Volts on the wire socket harness that goes to the Purge valve. i just bought a 9 Volt battery from the shop to confirm that even with low V it will work and it did! the valve open and clicked. so why when i hock its wire socket harness that has 13.01 volts its not jump or open! this is crazy
. so to summarized my story its like this :
Purge valve connecting directly to car battery = OK
Purge valve connecting to 9 volt battery = OK
Purge valve connecting to its harness that has 13 volts = Fail/ no click/ stay closed !
Thread Starter
Joined: Jun 2011
Posts: 17
From: Doha
I tried to do that when its struggle on idling. when i removed the socket or put it back nothing change. it idle like crap for moment then its ok. maybe you are right, the one is crap one.
Thread Starter
Joined: Jun 2011
Posts: 17
From: Doha
am not sure if this now a short or PCM or fuse? is there is fuse for it? i can see the voltage is vary from time to time on the Valve socket.
am having an issue related to the PCM as every summer when i turn the AC on, i got all O2 heaters error codes (no performance issue). when its winder, no AC and the issues gone. maybe it got worse and now the Purge valve p0443 is joining the party?
Thread Starter
Joined: Jun 2011
Posts: 17
From: Doha
I think fuse 47 controls all the sensors...it is possible that the fusebox or the wiring may have gotten wet at one point. That will cause corrosion, thus causing weird issues. Sadly there is really no way of knowing without taking things apart and checking resistance...maybe the fuse itself is corroded.
The red yellow wire should have voltage. Check the green black wire for resistance. If it has no resistance, check it for a short to power.
If I suspected 02 sensor problems, I would probably unplug those, to see if anything changed when I started it.
P0443 is almsost always one of these 3 things
The red yellow wire should have voltage. Check the green black wire for resistance. If it has no resistance, check it for a short to power.
If I suspected 02 sensor problems, I would probably unplug those, to see if anything changed when I started it.
P0443 is almsost always one of these 3 things
- Canister Purge Solenoid (CANP) Wiring
- Canister Purge Valve
- Fuse #47
thanks for taking time to help me. I was suspecting the Fuse 47. I will remove it and see if any changes happened or not. am not that good on electric things but am sure its simple thing.
I will let you know the update soon.