Mini Cooper workshop manual page 99

text version of content this owner's manual page from owners manual to the vehicle Mini Cooper, year of production 1961 - 2000:

EMISSIONCONTROL EMISSIONCONTROLSYSTEMS Thecorrect operation of the catalytic converter is dependent upon close control of the oxygen Thevehicle is fitted with various emission andconcentration of the exhaust gas entering the evaporative control components to comply withconverter. The quantity of oxygen in the exhaust gas emission regulation requirements. is determined by a heated oxygen sensor situated in the exhaust manifold. The heated oxygen sensor Thefollowing control systems are used to reduceprovides the engine control module with a signal harmful emissions released into the atmosphere atdependent on the oxygen content. The ECM can all times, and under all conditions:then adjust the amount of injected fuel, so that it can implement the necessary changes to achieve the 1. Exhaust emission control correct exhaust gas content. 2. Fuel vapour evaporative loss control 3. Crankcase emission control CAUTION:Seriousdamagetocatalytic converter will occur if leaded fuel is used. In many countries it is against the law for a vehicleThefiller neck is designed to owneroranunauthorisedrepair shop to modify oraccommodateonlyunleadedfuelpumpnozzles. tamper with emission control equipment. In this event the vehicle owner and/or the repairer may beEvaporativeemissioncanister liable for prosecution. Theevaporative emission (EVAP) canister is Theemissioncontrol system fitted to the vehicle issituated beneath the LH inner wing valance, and designed to keep the emissions within the legalcontains charcoal which absorbs and stores fuel limits, provided that the engine is correctlyfrom the fuel tank when the engine is not running. maintained and is in good mechanical condition.Whentheengineisrunningthevapourispurged from the canister into the engine and burned. Exhaustemissioncontrol TheEVAPcanisterispurgedwhentheEVAP Theenginemanagementsystemprovides canister purge valve is opened. Manifold depression accurately metered quantities of fuel to thedraws fresh air into the canister through the combustion chambers, to ensure the most efficientcharcoal, which releases fuel vapour into the inlet air to fuel ratio under all conditions of operation. Amanifold. further improvement to combustion is made by measuring the oxygen content of the exhaust gases.Evaporativeemissioncanisterpurgevalve This enables the quantity of injected fuel to be varied, which allows the ratio needed for efficientTheEVAPcanisterpurgevalveisoperatedbythe gas conversion by the catalytic converter to beECM.Thevalveremainscloseduntilengine maintained. temperature rises above 70°C. This is to maintain engine tune and catalyst performance. If the valve Thecatalytic converter is situated between thewastoopenwiththeenginecoldoratidlingspeed, exhaust front pipe and exhaust tail pipe. Thethe enriched mixture would delay catalyst light off catalytic converter reduces emissions of carbontime and cause erratic idling. When the purge valve monoxide, oxides of nitrigen (NOx) andopens, fuel vapour from the EVAP canister is drawn hydrocarbons. The active constituents of thealong a pipe through the valve and into the inlet converter are the precious metals palladium andmanifold for combustion. rhodium. DESCRIPTIONANDOPERATION 1

owners manual Mini Cooper