To check No. 1 purge control valve, remove hoses from charcoal canister. Attempt to blow through intake manifold port. Air should not pass. Attach vacuum pump/gauge to top port of purge control valve. Apply 4.3 in. Hg vacuum. Blow through intake manifold port. Air should flow through port. See Fig 1 . If not, replace.

Fig 1: Testing No. 1 Purge Control Valve
Courtesy of MAZDA MOTORS CORP.
The No. 2 purge control valve is an integral part of charcoal canister. Disconnect canister evaporation hose at line leading to fuel tank. Air should pass through valve under pressure and under vacuum, if valve is operating properly. See Fig 2 .

Fig 2: Testing No. 2 Purge Control Valve
Courtesy of MAZDA MOTORS CORP.
To test No. 3 purge control valve, disconnect hoses. Remove No. 3 purge control valve from vehicle. Connect vacuum pump/gauge to single port. Blow into port "A". Ensure air does not flow from port "B". See Fig 3 .
Apply about 3 in. Hg vacuum to port. Blow into port "A". Air should flow through port "B". If air does not flow, replace purge control valve.

Fig 3: Testing No. 3 Purge Control Valve

Courtesy of MAZDA MOTORS CORP.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Purge Control Valve