Chery A11 2003 - Page 652

When throttle is at idle position, engine speed less than 1500 rpm, intake manifold pressure
lower than a preset value and air/fuel mixture richness self-adapt, carbon canister solenoid
keep closed to ensure an more optimum engine performance.
(3) Fuel tank ventilation safety valve
it has the following functionsThe valve is installed on filter cover and has following
functions upon pressure inside fuel tank:
1. When pressure inside fuel tank exceeds 0.1—0.18bar, fuel vapor will be given out from
outlet (safety function).
2. When 0.020—0.030bar vacuum is generated in the fuel tank, air is drawn in
(ventilation function)
6. Engine anti-theft system (optional)The engine anti-theft unit is an alien frequency radar
anti-theft unit.
Fig 13 Engine anti-theft unit schematic
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The alien frequencies radar anti-theft system is an electric device, connecting with engine
control system, prevent vehicle from disoperation. One of characteristics engine
anti-theft unit on and off need no additional operation by user. When use alien frequency
radar transponder, the function is on as the key turns off and the function is off as the key
turns on. Each time the key turn on, the engine ECU needs a special authentication code.
The authentication code is processed upon code stored in ignition switch circuit. Only this
condition meets can the engine start.
Alien frequency radar anti-theft unit mainly consists of 3 components: anti-theft ECU,
antenna and transponder.
Anti-theft unit ECU is in a black plastic box and usually located on instruments panel.
Its electric device is in-line with alien frequency radar transponder and connects with engine
ECU. Antenna is fixed in a special channel in ignition switch and consists of copper coil
wrapped by a plastic jacket and a connector, which can connect with anti-theft ECU. The