Technical Definition:

Evaporative Emission System Vent Control Circuit

Technical Description:

Possible Causes:

• Faulty vent valve
• Open, short or excessive resistance on Vent valve control circuit
• Blockage of vent valve
• Bad PCM

Possible Symptoms:

Evaporative Emission Control System Vent Control Circuit Malfunction

Possible Solutions:

• Replace Vent valve
• Repair open, short, or resistance problem in control circuit
• Repair open, or short, or resistance problem in power circuit
• Replace PCM

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Missing Fuel cap
– Incorrect fuel filler cap used
– Fuel filler cap remains open or fails to close
– Foreign matter caught in fuel filler cap
– Vent control valve harness is open or shorted
– Vent control valve circuit poor electrical connection
– Faulty vent control valve

Specific Makes:

– Possible a noticeable fuel odor caused by the release of fuel vapors