What should the resistance of a vent control valve be?
Electrical Check – Check for resistance at the vent control valve. Most valve solenoid should measure between 30 Ω and 40 Ω, though some newer electronically-controlled valves may range between 2 Ω and 6 Ω. If resistance is as specified, 0 Ω or over 10 kΩ, replace the valve.
How does the ECM control the EVAP system?
The ECM (engine control module) uses pressure and voltage sensing and logical programming to control the EVAP system and to verify that it is sealing and venting when and where it should.
How does the evaporative emissions control system work?
The evaporative emissions control system, typically referred to simply as the “EVAP” system, has been designed to prevent fuel vapors from escaping into the atmosphere. The EVAP system is essentially a network of tubing and valves designed to store and release fuel vapors at the right time without permitting them to get into the atmosphere.
What should resistance of CCV be at room temperature?
Technicians will disconnect the CCV and measure the resistance across the terminals, between 25 Ω and 35 Ω at room temperature. If it’s outside the range, then the sensor must be replaced. Common repairs for this code include:
Electrical Check – Check for resistance at the vent control valve. Most valve solenoid should measure between 30 Ω and 40 Ω, though some newer electronically-controlled valves may range between 2 Ω and 6 Ω. If resistance is as specified, 0 Ω or over 10 kΩ, replace the valve.
What is the code for the EVAP vent?
The evap vent valve in most makes and models depends on a supply of a 12V battery voltage with key on. 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.
How does the evaporative emission control system work?
Instead of allowing these gases to leak into the atmosphere, the Evaporative Emission Control System stores fuel emissions in a charcoal canister until they can be reintroduced into the combustion cycle.
The ECM (engine control module) uses pressure and voltage sensing and logical programming to control the EVAP system and to verify that it is sealing and venting when and where it should.