19 4 PL FUEL SYSTEM Inspection : 1. Remove fuel filler cap. 2. If check result is not satisfactory, check for vaccum hose, purge valve, wire harness etc. Check carbon canister for signs of damage and defects. ● If defective, replace canister. ● If OK, go to step 3 3. Warmup 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 engine is running at idle speed. b) Alsocheck that vaccumis feltwhenengine speed is increased to higher than 2000/3000rpm. 6. Start engine and run it at idle speed. Disconnect vaccum hose(from canister purge valve to T Connector). Block the T connector port fromwhere the hose has been removed, with finger placed against the hose disconnected. Check that vaccum is applied. If it is not applied clean vaccum passage by blowing compressed air. Assembly : For hose connection refer schematic circuit diagram. Fig. 2 . The canister port consists of marking“purge” and “tank”. Fig. 24. e) Canister purge Valve : Fig. 25, 26 The canister purge valve is controlled by engine management system (EMS). The purging of canister takes place because of pressure differential betweenmanifold vacuumand atmosphere. Fuel vapours are drawn into the intake manifold through canister purge valve operated by ECU. Removal : 1. Disconnect hose from canister purge valve to T connector. 2. Disconnect the hose fromcanister to purge valve from canister “purge”end. Fig. 25
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