EVAP Canister Purge Valve Inspection

WARNING: This page is about a different variant/trim than selected.

Fig 1: Measuring Resistance Of EVAP Canister Purge Valve

Courtesy of GENERAL MOTORS CORP.

CAUTION: Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.

Remove the EVAP canister purge valve. Refer to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement .
Use a DMM in order to measure the resistance of the EVAP canister purge valve.
Measure: The EVAP canister purge valve resistance should be 26-30 ohms at 20°C (68°F).
Replace the EVAP canister purge valve if the resistance is not within the specified range. The solenoid can damage the powertrain control module (PCM) if the resistance value is less than 26 ohms.
Check the PCM and replace, if necessary. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Fig 2: Blowing Air Into Port

Courtesy of GENERAL MOTORS CORP.

Blow air into one of the ports. The air should NOT flow through the opposite port.
Apply battery voltage across the terminals of the EVAP canister purge valve.
Blow air into the one port. The air should flow easily to the opposite port.
Replace the EVAP canister purge valve if the valve failed either test. Refer to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement .