EVAP Canister Air Valve Circuit
WARNING:
DO NOT try to suck air through air valve. Fuel vapors inside valve are extremely harmful.
- Disconnect air valve hose from vapor canister. Blow air into hose "A". See Fig 1 or Fig 2. Air should come out of hose "B". Replace air valve if operation is not as specified. If operation is as specified and a scan tool is available, go to next step. If scan tool is not available, go to step 3.
- Connect scan tool to Data Link Connector (DLC). Turn ignition on. Select MISC TEST and turn on EVAP canister air valve using scan tool. Blow air into hose "A". Air should no longer come out of hose "B". If operation of air valve is as described, EVAP canister air valve and circuit are okay. If operation is not as described, go to step 4.
- Using a fused jumper wire, ground PCM connector terminal C21-3 on Esteem and Swift, E91-16 on Esteem 1.8L, C51-2-5 on Vitara 1.6L and 2.0L, or C51-3-19 on Grand Vitara. See PIN VOLTAGE/CIRCUIT RESISTANCE CHARTS article for PCM connector and terminal identification. Blow air into hose "A". Air should no longer come out of hose "B". If operation of air valve is as described, EVAP canister air valve and circuit are okay. If operation is not as described, go to next step.
- Turn ignition off. Disconnect EVAP canister air valve harness connector. Canister air valve is located on top of EVAP canister. Using an ohmmeter, measure resistance between valve terminals. Resistance should be 25-30 at 68°F (20°C). Resistance between each terminal and body of solenoid should be one megohm or greater. If resistance is as specified, go to next step. If resistance is not as specified, replace EVAP canister air valve. Retest system.
- Disconnect hoses from solenoid. Blow into port "A". See Fig 1 or Fig 2. Air should flow through valve. Use fused jumper wire to connect battery voltage and ground to air valve terminals. Air should not flow through port "B". If operation is not as specified, replace EVAP canister air valve. If operation is as specified, inspect for poor connections or open/short circuits in wiring between EVAP canister air valve, PCM and fuse box.