Evaporation Emission (EVAP) Canister Purge Solenoid Valve Diagnosis (1.8L)

1. Remove EVAP canister purge solenoid valve. Measure resistance between EVAP canister purge solenoid valve terminals. Resistance should be 27-33 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace EVAP canister purge solenoid valve.
2. Check for continuity between each EVAP canister purge solenoid valve terminal and valve body. If continuity exists, go to next step. If continuity does not exist, replace EVAP canister purge solenoid valve.
3. Blow into EVAP canister purge solenoid valve port No. 1. See Fig 1. Air should pass through port No. 2 with a high amount of resistance. Apply battery voltage and ground to EVAP canister purge solenoid valve terminals. With EVAP canister purge solenoid valve energized, blow into EVAP canister purge solenoid valve port No. 1. Air should pass easily through port No. 2. If operation is not as specified, replace EVAP canister purge solenoid valve.

Fig 1: Identifying EVAP Canister Purge Solenoid Valve Ports (1.8L)

Courtesy of GENERAL MOTORS CORP.