What is the PCM error code for the purge valve?
The PCM checks the voltage to the purge control valve, and if it unable to detect change with purge valve commanded on, it will trigger the Error Code P0444. This code is pretty similar to Error Code P0443 and P0445. As with other error codes, this code activates the Check Engine light, which is also its most common and noticeable symptom.
What causes a p0443 purge control circuit?
To cause a P0443, there has to be a problem with the purge control CIRCUIT , not necessarily the valve. Usually they are a unit housing the valve and the solenoid as an assembly. Or it could be comprised of a separate solenoid with vacuum lines to a purge valve. That said, it could be any of the following:
How does the purge valve work on an EVAP car?
For vehicles with EVAP (Evaporative Emission Control Systems), their engine draws in excessive fuel vapors through the gas tank that would otherwise be vented to the atmosphere. The fuel vapor is routed through a vacuum line to the engine’s intake, while the purge valve or solenoid meters the anticipated level of fuel vapors.
What causes purge control circuit to go bad?
To cause a P0443, there has to be a problem with the purge control CIRCUIT , not necessarily the valve. Usually they are a unit housing the valve and the solenoid as an assembly.
How to check the PCM / ECM purge control valve?
Verify the PCM/ECM is commanding the EVAP system on. If the system is functioning correctly, it will be necessary to back probe the PCM/ECM wiring harness connector using a graphing multimeter or oscilloscope with a duty cycle feature with the positive lead on the purge control valve pin and the negative lead connected to a known good ground.
To cause a P0443, there has to be a problem with the purge control CIRCUIT , not necessarily the valve. Usually they are a unit housing the valve and the solenoid as an assembly. Or it could be comprised of a separate solenoid with vacuum lines to a purge valve. That said, it could be any of the following:
What is the code for the purge valve?
The PCM/ECM monitors the voltage to the purge control valve and has detected no voltage change with the purge valve commanded on. Note: This code is similar to codes P0443 and P0445.
To cause a P0443, there has to be a problem with the purge control CIRCUIT , not necessarily the valve. Usually they are a unit housing the valve and the solenoid as an assembly.