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EVAPORATIVE EMISSIONS CONTROL SYSTEMS

EVAPORATIVE EMISSIONS CONTROL SYSTEMS. Chapter 8 Classroom Manual Page 244 Lab Manual Page 328. CBC AUTOMOTIVE RK. OBJECTIVES. Describe the operation of an evaporative (EVAP) control system during the canister purge and non purge modes. Diagnose & service evaporative systems.

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EVAPORATIVE EMISSIONS CONTROL SYSTEMS

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  1. EVAPORATIVE EMISSIONS CONTROL SYSTEMS • Chapter 8 • Classroom Manual Page 244 • Lab Manual Page 328 CBC AUTOMOTIVE RK

  2. OBJECTIVES • Describe the operation of an evaporative (EVAP) control system during the canister purge and non purge modes. • Diagnose & service evaporative systems. • Use scan tester to diagnose EVAP systems. • Diagnose EVAP system thermal vacuum valves CBC AUTOMOTIVE RK

  3. EVAP SYSTEMS • Gasoline (Hydrogen and Carbon) HC is a pollutant and must not be allowed to escape to the atmosphere. • Purpose of EVAP is to contain vapors from fuel tank and carburetor when engine is off. • Burn vapors in engine when warmand under cruise conditions. CBC AUTOMOTIVE RK

  4. SYSTEM DESIGNS • Main components are the charcoal canister, purge valve, rollover valve, lines. • Two types of EVAP systems • Mechanical - Vacuum controlled • Computerized - Electrically controlled CBC AUTOMOTIVE RK

  5. 246C CHARCOAL CANISTER • Typical canister in vapor storage mode. • Absorbs vapors from carburetor and fuel tank CBC AUTOMOTIVE RK

  6. 245C PURGE VALVES • Ford Purge valves. • Typically normally closed • Purges above idle CBC AUTOMOTIVE RK

  7. 245C ROLLOVER VALVE • Located in top of the fuel tank. CBC AUTOMOTIVE RK

  8. OBD II Evaporative Emission System Monitor • Tests ability of fuel tank to hold pressure • Tests ability of purge system to vent vapors from charcoal canister • Detects leaks and restrictions is EVAP system • Fuel tank will cause MIL light to come on.

  9. That’s all Folks!

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