General information
To prevent air pollution due to incomplete combustion or evaporation of the fuel and to maintain good driving performance and fuel economy, these vehicles have several emission control systems. Not all of these systems are installed on all models, however, they include:
- catalytic converter
- Gasoline vapor recovery system (EVAP)
- crankcase ventilation system (PCV)
- Electronic engine management system
The sections in this Chapter include general descriptions and inspection procedures within the scope of the home workshop, as well as procedures for replacing components (where possible) for all of the above systems.
Before suspecting an emission control system failure, carefully check the fuel and ignition systems. Diagnosis of some devices of the toxicity control system requires special tools, equipment and training. If inspection and maintenance become too difficult, or if the procedure is beyond your ability, consult your dealer or other specialist.
The most common cause of problems in the emission control system is a leak in the vacuum hose and a loose wire, so always check the hose and wire connections first.
This, however, does not mean that the emission control system is particularly difficult to maintain and repair. You can quickly and easily perform many checks and do most of the periodic maintenance at home with common appliances and hand tools.
Pay close attention to any special precautions given in this Chapter. It should be noted that the illustrations of the various systems may not exactly match the systems installed on your vehicle, as the manufacturer makes changes during the production process.