NANO

ENGINE 273 MPFI 213 ENGINE Canister Purge Valve The canister purge valve is controlled by engine man- agement system (EMS). The purging of canister takes place because of pressure differential between mani- fold vacuum and atmosphere. Fuel vapours are drawn into the intake manifold through canister purge valve operated by ECU. Inspection: 1. Remove fuel filler cap. 2. If check result is not satisfactory, check for vaccum hose, purge valve, wire harness Check carbon canister for signs of damage and de- fects. 1. If defective, replace canister. 2. If OK, go to step 3 3. Warm up engine to normal operating temperature. 4. Disconnect “purge” end hose (from the canister to purge valve) 5. a) Place finger against the end of disconnected hoses. Check that vaccum is felt there when en- gine is running at idle speed. b) Also check that vaccum is felt when engine speed is increased to higher than 2000/3000 rpm. 6. Start engine and run it at idle speed. Disconnect vaccum hose (from canister purge valve to T Con- nector). Block the T connector port fromwhere the hose has been removed, with finger placed against the hose disconnected. Check that vaccum is ap- plied. If it is not applied, clean vaccum passage by blowing compressed air. Removal: 1. Disconnect hose fromcanister purge valve to T con- nector (fuel rail side). 2. Disconnect the hose from canister to purge valve. Inspection: 1. With ignition switch OFF, disconnect connectors from canister purge valve. 2. Check resistance between two terminals of canis- ter purge valve. It should be 26 + 4 Ohm at 20°C. If resistance is as specified, proceed to next opera- tion, check. If not, replace. 3. Blow air into hose removed fromT connector. 4. Verify that no air flows through the valve when the engine is stopped with purge valve connectors dis- connected. 5. Air will pass through freely when the 12V battery voltage is applied to valve connector. It indicates that the valve is functioning properly. If no air flows, replace the valve. 6. Reinstall valve connector. 7. Reconnect vacuum hoses. WARNING Do not suck air through purge valve. Fuel vapour inside valve is harmful. WARNING Do not suck air through canister port. Fuel vapours inside canister is harmful.