Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello and welcome! My name is ***** ***** I can assist you with your question. Whichy valves have been replaced? Are you saying that the canister purge valve and canister vent valve were both replaced? What is reading 11.8 volts? Have you smoked checked the evap system as of yet?
Have you checked the power and ground at the purge solenoid?
Excellent! You will need to check the ground coming from the PCM. The voltage on the signal wire from the PCM should go to 0 volts when the computer is commanding the purge solenoid to open. If not, then either the driver inside the PCM is bad or there is a wiring issue between the PCM and purge solenoid.
Here is some info on this code.
P0443 EVAP Purge Solenoid Control Circuit Malfunction
Possible Causes Purge solenoid ignition circuit is open (check the IGN-1 fuse in U/H fuse block)Purge solenoid control circuit is open, shorted to ground or shorted to voltagePurge solenoid connector is damaged (check pins for damage, and moisture)Purge solenoid has failedPCM has failed
An ignition voltage is supplied directly to the evaporative emission (EVAP) purge valve. The EVAP purge valve is pulse width modulated (PWM). The control module controls the EVAP purge valve ON time by grounding the control circuit via an internal switch called a driver. The scan tool displays the amount of ON time as a percentage. The control module monitors the status of the driver. If the control module detects an incorrect voltage for the commanded state of the drive, DTC P0443 sets.
Sounds good! Your welcome.
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