- a) Positive crankcase ventilation system (PCV)
- b) Fuel Evaporative Control System (FECS)
- c) Exhaust gas recirculation system (EGR)
- d) Fuel afterburning system
- d) Catalytic converter and oxygen sensor
This chapter provides general information, inspection procedures (which are within the vehicle owner's ability) and component replacement procedures (where possible) for the systems listed above. Assumptions about a faulty emission control system can only be made after a thorough inspection of the fuel and ignition systems (chapter 4A and 5B). Diagnostics of some emission control system devices requires special equipment and experience. Therefore, if the procedure is difficult for you, consult with the dealer.
However, you can perform many verification procedures yourself.
Note: The most common cause of failure for the systems described is a faulty electrical connection or a defective vacuum hose. Therefore, always check the electrical connectors and vacuum hoses first.
Please note the special precautions given in this chapter. Not all illustrations may exactly match the systems of your vehicle. The manufacturer is constantly improving its products.
Some vehicles have a label with emission control information and a diagram of the vacuum hoses located in the engine compartment. When servicing the engine or emission systems, check the information on the label to make sure it matches the current condition of the vehicle.
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