EVAP canister purge valve (321), T8
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EVAP canister purge valve (321), T8
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EVAP canister purge valve (321)
The purge valve controls the amount of air/hydrocarbons which are to be drawn into the engine according to the current operating conditions.
Fuel which evaporates in the tank is led through a pipe to the evap. canister. The active carbon in the canister becomes saturated as it absorbs the hydrocarbon vapours. When the motor starts ambient air is sucked through the carbon filter via the purge valve and a non-return valve in the intake manifold. The petrol vapours follow with the air and are burnt in the engine.
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Pin No.
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Signal type
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Description
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1
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Power supply, b+
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The purge valve's power supply from the main relay.
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2
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Control
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Operation of the purge valve. The purge valve is grounded by ECM pin 17(b). The signal is normally PWM, 16Hz, but during the tank integrity diagnosis it is 8 Hz.
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When not supplied with current the purge valve is closed.
