difference between the inlet and outlet hole. When no electric pulse is produced, the canister control valve will be closed. According to the signals from each sensor, the ECU can control the time for power connection of the canister solenoid valve, and then control the volume of the cleaning air flow. (3) Trouble diagnosis: The ECU will carry out trouble diagnosis for the driving stage of the canister control valve.
When the driving stage of the canister control valve is short or overloaded to the battery voltage, as well as short and open to the ground, the fuel ration closed loop control self-learning and the idle speed air ration self-learning will be closed, while the self-leaning data at that moment will be effective. When the canister solenoid valve is under trouble, the engine is likely to experience unstable idle speed or over-high idle speed. (4) Parts circuit (Fig. 1-20) Fig. 1-20 37