What causes a low purge flow?
A leak within the emissions system may be a sign of solenoid failure. The purge control valve reacts to the vapor vacuum within the canister by opening and closing. If the canister, or any of the supply lines, are blocked or have holes, the solenoid cannot function and the purge control valve will remain closed.
What does low purge flow mean?
OBD-II Code P0497 is defined as a Evaporative Emission System Low Purge Flow. The evaporative control (EVAP) system captures any fuel vapors from the fuel tank and sends them through the vehicle’s intake to be burned in the normal combustion process.
What does the p0497 code mean on a car?
The P0497 code, or Evaporative Emission System Low Purge Flow, is indicative of a problem somewhere in the EVAP control system. When a vehicle sets the P0497 code, it lets you know that there is a fault in the evaporative control system, the system which helps to regulate the amount of fuel vapor that is released into the environment.
When does the EVAP purge valve set code p0497?
The EVAP Purge Valve allows vapors from the EVAP System to enter the intake and go through the engine’s combustion process. When the engine control module (PCM) detects the evap system is not purging when it should, it will set code P0497. No comments yet…
How can I check the purge control solenoid?
Use the scanner to activate the purge control solenoid and physically check vacuum flow with the engine running and the purge control solenoid activated. If the solenoid fails to open when activated, check system voltage and ground signals as compared to manufacturer’s specs. If voltage and ground signals are present, suspect a defective solenoid.
How to identify an EVAP purge flow problem?
Procedures required to pinpoint an EVAP purge flow problem may include: Recording stored codes and freeze frame data with a scanner, and clearing those codes from the vehicle’s memory to see if they return. Visual inspection of the charcoal canister, purge valve, hoses, wiring, and connections.