DTC P0497: Evaporative Emission (EVAP) System Low Purge Flow Detected: Notes

Fig 1: DTC P0497 Evaporative Emission (EVAP) System Air Flow Diagram

Fig 2: Evaporative Emission (EVAP) System Purge Flow

Fig 3: Identifying Evaporative Emission (EVAP) System Purge Flow NG Position

EVAPORATIVE EMISSION SYSTEM PURGE FLOW FAILURE CONDITION

Negative pressure area purge flow	Boost area purge flow	Purge flow adverse current	Failure condition
Yes	Yes	Normal determination	Purge line normal, EVAP canister purge valve normal
Yes	Yes	Abnormal determination	Non-return valve A open failure
No	Yes	-	Negative pressure area purge line failure
Yes	No	-	Boost area purge line failure
No	No	-	Purge line failure or EVAP canister purge valve OPEN failure