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Emissions control systems / General information


To minimise pollution of the atmosphere from incompletely-burned and evaporating gases, and to maintain good driveability and fuel economy, a number of emission control systems are used on these vehicles. They include the following:
(a) The engine management system (comprising both fuel and ignition subsystems) itself.

(b) Positive Crankcase Ventilation (PCV) system.

(c) Evaporative Emissions Control (EVAP) system.

(d) Exhaust Gas Recirculation (EGR) system.

(e) Catalytic converter.

The Sections of this Chapter include general descriptions, checking procedures within the scope of the home mechanic, and component renewal procedures (when possible) for each of the systems listed above.

Before assuming an emissions control system is malfunctioning, check the fuel and ignition systems carefully (see Chapters 4 and 5). The diagnosis of some emission control devices requires specialised tools, equipment and training. If checking and servicing become too difficult, or if a procedure is beyond the scope of your skills, consult your dealer service department or other specialist.

This doesn’t mean, however, that emission control systems are particularly difficult to maintain and repair. You can quickly and easily perform many checks, and do most of the regular maintenance, at home with common tune-up and hand tools. Note: The most frequent cause of emissions problems is simply a loose or broken electrical connector or vacuum hose, so always check the electrical connectors and vacuum hoses first.

Pay close attention to any special precautions outlined in this Chapter. It should be noted that the illustrations of the various systems may not exactly match the system installed on your vehicle, due to changes made by the manufacturer during production or from year-to-year.

Vehicles sold in some areas will carry a Vehicle Emissions Control Information (VECI) label, and a vacuum hose diagram located in the engine compartment. These contain important specifications and setting procedures for the various emissions control systems, with the vacuum hose diagram identifying emissions control components.

When servicing the engine or emissions systems, the VECI label in your particular vehicle should always be checked for up-todate information.


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