System Description
SIGNAL REFERENCE
| Sensor | Input Signal to ECM | ECM function | Actuator | ||||
|---|---|---|---|---|---|---|---|
| Crankshaft position sensor (POS) Camshaft position sensor (PHASE) | Engine speed(1) | EVAP canister purge flow control | EVAP canister purge volume control solenoid valve | ||||
| Mass air flow sensor | Amount of intake air | ||||||
| Engine coolant temperature sensor | Engine coolant temperature | ||||||
| Battery | Battery voltage(1) | ||||||
| Throttle position sensor | Throttle position | ||||||
| Accelerator pedal position sensor | Accelerator pedal position | ||||||
| Air fuel ratio (A/F) sensor 1 | Density of oxygen in exhaust gas (Mixture ratio feedback signal) |
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| Fuel tank temperature sensor | Fuel temperature in fuel tank | ||||||
| Wheel sensor | Vehicle speed(2) | ||||||
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This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass passage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the ECM. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor from the EVAP canister is regulated as the air flow changes.