EVAP Canister Vent Valve Inspection

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Measuring EVAP Canister Vent Valve Resistance

Courtesy of GENERAL MOTORS CORP.

CAUTION: Refer to Fuel Vapors in Evaporative Emission (EVAP) Components Caution in Cautions and Notices.

Disconnect the EVAP vent solenoid electrical connector.
Use a DMM in order the measure the solenoid resistance value.
Measure: The resistance should be between 25-30 ohms at 20° C (68° F).
Replace the solenoid if the resistance is not within the specified range. Refer to Evaporative Emission (EVAP) Canister Vent Solenoid Valve Replacement .

Fig 2: Checking Continuity Between Solenoid Terminal And Solenoid Housing

Courtesy of GENERAL MOTORS CORP.

Use a DMM in order the check for continuity between each solenoid terminal and solenoid housing.
Measure: The DMM has to read infinite (OL).
Replace the EVAP vent solenoid valve if the resistance is not within specification. A shorted valve will cause damage to the PCM.

Fig 3: Blowing Air Through Upper Port Of EVAP Vent Valve

Courtesy of GENERAL MOTORS CORP.

Blow air through the upper port of the EVAP vent valve. Air has to flow freely through the lower port.
Replace the valve if the air does not flow through the upper port. Refer to Evaporative Emission (EVAP) Canister Vent Solenoid Valve Replacement .

Fig 4: Applying Battery Voltage Across Solenoid Terminals

Courtesy of GENERAL MOTORS CORP.

Apply battery voltage across the solenoid terminals.
Blow air through the upper port of the solenoid. Air should NOT flow through the valve.
Replace the solenoid if the solenoid fails any of the tests. Refer to Evaporative Emission (EVAP) Canister Vent Solenoid Valve Replacement .