Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Emission Control Systems: Description and Operation





The following systems are employed to reduce CO, HC, and NOx emissions.
1. Secondary air injection (CO, HC)
2. Crankcase ventilation system (HC)
3. Fuel evaporative system (HC)
4. Three-way catalytic converter (CO, HC, NOx)
5. Deceleration control system (CO, HC)