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advanced identification and correction strategy such as enrich air/fuel mixture shall be adapted to reduce ignition advance angle. Operational theory: Knock sensor consist of piezoelectric non-resonant quartz and converts electric signal into mechanical energy in form vibrations. The sensor is connected to engine ECU through a shielded wire. When knock occurs, ECU will receive peak values of high-energy signal, which is discriminable from normal combustion signal. During knocking, air/fuel mixture shall accordingly enrich to ensure exhaust temperature is within the safe specification when appropriate reducing of ignition advance angle is needed, The knock sensor is installed on the cylinder body between cylinder2 and cylinder3, on the side of intake manifold. Tighten torque is 19.6±4.9Nm. USE SPECIAL CARE to this torque specification.
5. Preventing fuel from evaporating and fuel vapor recycle system By this system, fuel vapor formed in fuel tank and fuel feed system is combusted in engine combustion chamber after filtering, prevent fuel vapor from being exhausted into atmosphere. (1) Active carbon canister Active carbon canister is used for absorbing and storing fuel vapor in fuel tank and fuel vapor is then transferred into air intake manifold through carbon canister control solenoid. (2) Carbon canister solenoid Under the control of ECU, carbon canister solenoid has the following functions: 1. When ngine stop running and under stop condition, carbon canister solenoid prevent fuel vapor in fuel tank from entering air intake manifold. When ignition key is turned to MAR position, closed carbon canister solenoid will start to work. l start to work. 2. At the stage of engine start-up, carbon canister keep closed to prevent fuel vapor over enriching air/fuel mixture, which will last till engine Fig 11 Konck Sensor 1. Knock sensor connector 2. Knock sensor 3. Sensor wiring 4. locking nut
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