Evaporation Emission (EVAP) Canister Purge Valve Diagnosis (1.0L & 1.3L)

1. Disconnect EVAP canister purge valve electrical connector. Measure resistance between EVAP canister purge valve terminals. Resistance should be 28-39 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 valve.
2. Disconnect EVAP canister purge valve vacuum hoses from intake manifold and EVAP canister. Blow into EVAP canister purge valve vacuum hose that was disconnected from EVAP canister. Air should not pass through EVAP canister purge valve and exit from intake manifold hose. See Fig 1 or Fig 2 .
3. Apply battery voltage and ground to EVAP canister purge valve terminals. With EVAP canister purge valve energized, blow into EVAP canister purge valve vacuum hose that was disconnected from EVAP canister. Air should pass through EVAP canister purge valve and exit from intake manifold hose. If operation is not as specified, replace EVAP canister purge valve.

Fig 1: Identifying EVAP Control System Components (1.0L)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Identifying EVAP Control System Components (1.3L)

Courtesy of GENERAL MOTORS CORP.