How to Determine if the Charcoal Canister Solenoid Valve is Good or Bad?

[StMaddox]

The methods to determine the condition of the charcoal canister solenoid valve are: 1. When the vehicle experiences fuel nozzle jumping during refueling, the charcoal canister is filled with gasoline, the throttle feels weak or jerky, and the idle speed is unstable, fluctuating up and down; 2. If the engine cannot start after shutting off or there are abnormal noises while driving, it indicates that the charcoal canister solenoid valve is damaged. The solutions for a damaged charcoal canister solenoid valve are: 1. Clean the fuel tank exhaust system; 2. Clean or replace the charcoal canister solenoid valve. The working principle of the charcoal canister solenoid valve is: It controls the purging function of the charcoal canister through the modulation of electrical pulse width. The ECU computer, based on different engine operating conditions, grounds or interrupts the solenoid valve circuit at a certain frequency. The ECU computer controls the vacuum of the purging charcoal canister by operating the normally closed solenoid valve.