If it does not and code P0446 is still set, problems with circuitry or parts persist. If you fix the evap vent valve and resolve the problem, the Check Engine malfunction indicator lamp on the dash should turn off.
Otherwise, it may be necessary to replace the evap vent valve or PCM to clear this code and turn off the Check Engine malfunction indicator lamp. It can be a good idea to confirm that power is flowing through the control and power circuits and ensure that open, shorting or resistance problems are not present. Some fixes may not require replacement parts. Check the specifications in the manual for your vehicle make, year model and engine build before attempting to test or repair vent valve control or power circuits, the vent valve or a faulty powertrain control module. Resolving the problem causing this code can be a challenge because there are few indications of the problem beyond the vent valve itself. The ECM driver closes this valve when grounded and will set code P0446 if there is an open or short to ground or battery voltage or it is not possible to form a vacuum seal. The evap vent valve in most makes and models depends on a supply of a 12V battery voltage with key on. P0446 tends to be returned by diagnostic testing when the control circuit for the evap vent valve is not achieving the seal that enables the EVAP system in the vehicle to hold pressure. Which Faulty Parts or Malfunctions Can Cause Trouble Code P0446?
The letter P indicates a generic powertrain code, while the number 0446 points more specifically toward a malfunctioning vent control circuit in the evaporative emission control system. When a diagnostic scan of an automotive computer outputs the trouble code P0446, it is important to understand the meaning of the letter and numbers in this alphanumeric string.
0 kommentar(er)
