Question about Cars & Trucks
To cause a P0443, the problem exists within the purge control circuit, not necessarily in the valve itself. Any one of the following can cause the code to be thrown:
-Bad purge solenoid (internal short or open)
-Wiring harness chafing or rubbing another component causing short or open on control circuit
-Connector worn, broken or shorted due to water intrusion
-Driver circuit inside powertrain control module (PCM) is bad
1. Use a scan tool to force the solenoid to activate (you will need a good scanner, not just a trouble code reader). Listen or feel for a clicking coming from the purge solenoid. It should click once, or on some models it may click repeatedly.
2. If it doesn't click when trying to use a scan tool, unplug the connector and examine the solenoid/connector for damage, water, etc. Follow this with a voltage check on the feed wire with the key in the on position. If there is voltage, ground the control side manually with a jumper cable; if it clicks the solenoid is working properly, but the control circuit is not working properly. If there is no click, then replace the solenoid.
3. To check for a problem on the control circuit (if the solenoid tests okay and you have voltage to the solenoid) plug the solenoid back in and remove the control circuit (ground) wire from the ECM connector (If you're unsure how to do this, do not attempt). With the ground wire removed from the ECM, turn the key on and then manually ground the Purge valve control wire. The solenoid should click. If it does, then the problem is in the ECM purge solenoid driver, and the ECM needs to be replaced. However if it doesn't click, then there must be an open in the wiring between the ECM and and the solenoid. Find and repair it.
Posted on Feb 07, 2014
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Posted on Jan 02, 2017
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