Fuel Clearing Control (Camry 2.2L 4-Cyl. CNG Models)
After vehicle is driven at speeds greater than approximately 38 MPH and ignition is turned off after Engine Control Module (ECM) has detected intake air temperature is less than 77°F (25°C), ECM closes fuel rail fuel shutoff valve. Engine will not stop immediately, as fuel clearing control allows engine to stop after fuel in fuel rail has been used. If engine remains running for more than 2 seconds after ignition is turned off, EFI main relay will be turned off to stop the engine.
Fuel Cut System (Avalon, Camry, Camry Solara, Celica, Corolla, ECHO, Land Cruiser, MR2, Prius, RAV4, Sequoia, Sienna, Tacoma, Tundra & 4Runner)
Controlled through input signals, Engine Control Module (ECM) will shut off fuel delivery momentarily during closed throttle deceleration.
Fuel injectors are electrically operated solenoids which deliver fuel to individual cylinders. Engine Control Module (ECM) controls fuel injector duration based on various input signals to determine air/fuel mixture.
Fuel Injector Unsticking Control (Camry 2.2L 4-Cyl. CNG Models)
When ignition is turned on after fuel clearing control was performed, fuel injector unsticking control activates 2 fuel injectors at one time to free the valve in the fuel injector that is stuck to the valve seat. At low temperature conditions, fuel rail fuel shutoff valve remains closed so fuel injectors will not inject fuel. This prevents fuel injector from sticking and ensures engine starts at low temperature conditions.
Fuel Leak Detection (Camry 2.2L 4-Cyl. CNG Models)
Was this article helpful?