Honda CR-V: Emissions Controls

The burning of gasoline in your vehicle’s engine produces several byproducts.

Some of these are carbon monoxide (CO), oxides of nitrogen (NOx), and hydrocarbons (HC).

Gasoline evaporating from the tank also produces hydrocarbons. Controlling the production of NOx, CO, and HC is important to the environment.

Under certain conditions of sunlight and climate, NOx and HC react to form photochemical ‘‘smog.’’ Carbon monoxide does not contribute to smog creation, but it is a poisonous gas.

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 The Clean Air Act

The United States Clean Air Act* sets standards for automobile emissions. It also requires that automobile manufacturers explain to owners how their emissions controls work and what to do to

 Crankcase Emissions Control System

Your vehicle has a positive crankcase ventilation system. This keeps gasses that build up in the engine’s crankcase from going into the atmosphere. The positive crankcase ventilation valve

 Evaporative Emissions Control System

As gasoline evaporates in the fuel tank, an evaporative emissions control canister filled with charcoal adsorbs the vapor. It is stored in this canister while the engine is off. After the en

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 Starting the Engine

1. Apply the parking brake. 2. In cold weather, turn off all electrical accessories to reduce the drain on the battery. 3. Make sure the shift lever is in Park. Press on the brake pedal. 4. Without touching the accelerator pedal, turn the ignition key to the START (III) position. Do not

 Relay and Control Unit Locations

Engine Compartment VSA MODULATOR-CONTROL UNIT AUXILIARY UNDER-HOOD RELAY BOX POWER MIRROR DEFOGGER RELAY PCM RADIATOR FAN RELAY ELECTRONIC THROTTLE CONTROL SYSTEM (ETCS) CONTROL RELAY ELD UNIT PGM-FI MAIN RELAY 1 (FI MAIN) UNDER-HOOD FUSE/RELAY BOX FAN CONTROL RELAY BLOWER MOTOR RELAY

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