How does the PCM control the purge rate?
By comparing the actual flow rate with the desired flow rate, the PCM can control the opening and closing of the purge valve in such a way that the two flow rate values (actual and desired) agree.
What does purge flow mean on a car?
Another term you should familiarize yourself with is purge flow. This simply refers to the amount of fuel vapors that are channeled to the engine. This quantity varies depending on the amount of air that’s entering the system via the intake vacuum.
What to do if check engine light code p0172 persists?
If check engine light code P0172 persists after you have inspected the air intake system and cleaned the Mass Air Flow (MAF) Sensor, perform a fuel pressure test. If any components in the fuel system are failing, replace them as necessary.
What is the code for high purge flow?
In Acura, Honda, Hyundai, Kia, and Mazda vehicles, this code is described “EVAP system high purge flow” which is the same thing. This DTC checks for undesired intake vacuum flow to the EVAP system. The control module seals the EVAP system by commanding the EVAP canister purge solenoid valve OFF and the EVAP canister vent solenoid valve ON.
What is the code for the canister purge valve?
Your canister purge valve is controlled by your car’s computer, which allows it to monitor its performance. If your car’s computer detects higher or lower than expected purging from the valve, it will illuminate the check engine light. Common error codes include P0441 and P0446, as well as other EVAP codes.
What happens when the purge valve is stuck?
In case of a fault, the ECM will set an evaporative emissions diagnostic trouble code (DTC) and illuminate the MIL (malfunction indicator lamp). One common problem in the EVAP system occurs when the ECM detects a vacuum when there shouldn’t be one, for example, if the purge valve is stuck open.
How do you replace the evap.purge valve solenoid on 2005?
Unplug the electrical connector on the purge valve, start the engine, then put your finger on the valve where you disconnected the line. If you can feel vacuum there, the purge solenoid valve is faulty and needs to be replaced. Alternately, you could simply remove the purge solenoid valve and blow into it.