Smog Check Program Lecture Notes

Overview

• The module provides an overview of the Smog Check Program and inspection procedures.
• Key elements of the inspection process include:
  • Visual inspection
  • Emissions test
  • Functional tests
  • Inspection results

Visual Inspection

• Ensures vehicle's emission components are present, properly connected, and not modified.
• Inspectors verify vehicle information with the Department of Motor Vehicles (DMV).
• Checks for aftermarket parts certification and liquid fuel leaks.

Emission Control Systems

• Inspectors assess various systems:
  • Positive Crankcase Ventilation: Reduces hydrocarbons and carbon monoxide.
  • Thermostatic Air Cleaner: Supplies warm air during cold engine operation.
  • Air Injection System: Reduces hydrocarbons and carbon monoxide.
  • Fuel Evaporative System: Prevents smog-forming hydrocarbons.
  • Exhaust Gas Recirculation (EGR): Reduces oxides of nitrogen.
  • Computerized Engine Control: Includes sensors like Oxygen and Throttle Position Sensor.
  • Catalytic Converter: Converts toxic gases to less harmful substances.

Emissions Test

• Conducted to determine the actual composition of exhaust gases.
• Includes a 5-gas emission analyzer and may involve a dynamometer.
• Tests include Acceleration Simulation Mode (ASM) and Two-Speed Idle test.

Functional Tests

• Confirm the operation of certain emission components.
• Include EGR system tests and ignition timing checks.
• On-Board Diagnostics II (OBD II) systems monitor emissions and can signal MIL issues.

Visible Smoke Test

• Involves idle and snap tests to check for smoke emissions.
• Smoke tests are critical for passing the inspection.

Inspection Results

• Results are transmitted to the Vehicle Information Database (VID).
• Pass/Fail Criteria: Based on visual inspections, emissions, and functional tests.

Reporting and Documentation

• Inspection outcomes are recorded and communicated to the DMV.
• A Certificate of Compliance is issued for passing vehicles.

Key Points

• Inspectors use an Emissions Inspection System (EIS) for data recording.
• Use of appropriate reference materials for accurate inspection.
• Safety protocols are followed during inspections.

Conclusion

• The module concludes with procedures for verifying and documenting the inspection process.