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 quantity of air/fuel drawn into the engine for the current operating conditions.
The fuel which evaporates in the tank is passed through a pipe to the evaporative emission canister. The active charcoal in the canister absorbs the hydrocarbon vapours. When the engine starts, ambient air is drawn through the canister via the purge valve and a check valve into the intake manifold. The petrol vapours follow and are burned 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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EVAP canister purge valve power supply from main relay.
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2
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Control
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EVAP canister purge valve operation. The EVAP canister purge valve is grounded by ECM pin 17(B). The signal is normally PWM, 16 Hz, but is 8 Hz during the tank integrity diagnosis.
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When without power, the purge valve is closed.
