The ECU controls the purge of the adsorber including the solenoid valve 16 (see fig. Injection wiring diagram), located on the cover of the adsorber. When voltage is applied to the valve, it opens, releasing vapors into the intake pipe. The valve is controlled by the method of pulse-width modulation. The valve turns on and off at a frequency of 16 times per second (16 Hz). The higher the air flow, the longer the duration of the valve activation pulses.
The ECU turns on the canister purge valve when all of the following conditions are met:
- coolant temperature above 80°C;
- the fuel management system operates in closed loop mode;
- vehicle speed exceeds 21 km/h. After the valve is turned on, the speed criterion changes. The valve will turn off only when the speed drops to 9 km / h;
- throttle opening is greater than 2%. This factor does not matter further if it does not exceed 99%. When the throttle is fully opened, the ECU turns off the canister purge valve.
Examination
1. Inspect hoses and adsorber. If there are cracks or damage to the body, replace the adsorber with a new one.
2. If there are leaks, check the tightness of the hose connections. If fuel leaks from the adsorber, replace it with a new one.