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Circuit/System Description

EVAP leak detection pump switching valve performance - checks if the EVAP leak detection pump switching valve moved.

When the EVAP leak detection vacuum pump is ON, and the EVAP leak detection pump switching valve transitions from vent to not venting, pump, position, there should be an initial vacuum drop followed by a vacuum increase on a good system. The diagnostic looks for a difference relative to the reference vacuum, either an increase or decrease. No vacuum change indicates a problem with the EVAP leak detection pump switching valve and sets P2450. If P2450 fails, then the EVAP diagnostic leak detection test sequence is complete.

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