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Texas Emissions Inspection Guide: On-Board Diagnostics Testing for Designated Vehicles, Slides of Diagnostics

Haute Ecole Lucia de BrouckereDiagnostics

This study guide from the Texas Department of Public Safety provides information on On-Board Diagnostics (OBD) testing for designated vehicles in Texas. The guide covers the history of emissions testing, affected counties, designated and exempt vehicles, waivers and extensions, inspection/testing fees, and the OBD II inspection procedure. It also includes details on locating the Diagnostic Link Connector (DLC) and interpreting Malfunction Indicator Lights (MIL).

Typology: Slides

2021/2022

Uploaded on 08/05/2022

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Texas Department of Public Safety
Emissions Inspector Study Guide
Subject: On-Board Diagnostics Testing
Texas Department of Public Safety | December 2021
Produced by the Department of Public Safety. Duplication in part or in whole of this material is
expressly prohibited, unless written consent from the Department is given.
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Download Texas Emissions Inspection Guide: On-Board Diagnostics Testing for Designated Vehicles and more Slides Diagnostics in PDF only on Docsity!

Emissions Inspector Study Guide

Subject: On-Board Diagnostics Testing

Texas Department of Public Safety | December 2021

Produced by the Department of Public Safety. Duplication in part or in whole of this material is expressly prohibited, unless written consent from the Department is given.

Table of Contents

Part 1: Air Quality and Emissions Testing, p.

Part 2: History of OBD II Training, p.

Part 3: Affected Counties, p.

Part 4: Designated/Exempt Vehicles, p.

Part 5: Waivers & Extensions, p.

Part 6: OBD II Inspection, p. 10

  1. Introduction
  2. Applicability
  3. Procedure
  4. How Monitor Becomes Ready
  5. Probable Causes of ODB II Failures
  6. Fuel Cap Test Part 7: Review, p. 59

History of Emissions Program in Texas

  • Texas emissions testing began in 1990 and has evolved into the current

program now in use.

  • The primary testing program currently in place is the On-Board Diagnostics

(OBD II) test. OBD II protocol began in 1996.

  • Gasoline powered vehicles that are 2-24 years old must complete an On-

Board Diagnostics (OBD) test in accordance with State and Federal requirements. The primary purpose of OBD II is to ensure that vehicles emit the minimum level of pollutants through their useful life.

1996 Chevy Corvette 2020 Chevy Corvette

Affected Counties

  • An Affected County is any county participating in an inspection and maintenance program (I/M) to reduce harmful emissions from motor vehicles.
  • 17 counties in Texas are participating in Emissions Testing

Waivers and Extensions

To apply for a waiver, motorists must demonstrate that they have taken every reasonable measure to comply with the requirements of the vehicle emissions I/M program and a waiver shall have minimal impact on air quality.

Individual Vehicle Waiver

  • The motorist has taken every reasonable measure to comply with the requirements of the vehicle emissions I/M program and a waiver shall have minimal impact on air quality.

Low Mileage Waiver

  • Low mileage exemption for motorists who drive less than 5,000/year.
    • Fail both the initial test and free retest
    • Incur $100 of emissions related repairs
    • Drive less than 5,000 miles/year. Low-income Time Extension
  • If the vehicle failed the emissions test and your annual income is below the national poverty level, you may be granted a one-year extension.

Advise customers to contact their local Texas Department of Public Safety Vehicle Inspection Waiver office for further information on waivers and extensions or visit Waivers and Time Extensions | Department of Public Safety (texas.gov)

Inspection/Testing Fees

Refer to the following fee

chart for your “affected

county”

• Dallas/Ft. Worth

• El Paso County

• Houston/Galveston

• Travis and Williamson

Texas Department of Public Safety

INSPECTING ONBOARD

DIAGNOSTIC (OBD II) SYSTEMS

INTRODUCTION: OBD II Inspection

  • On-Board diagnostic systems (OBD) on gasoline-powered vehicles from 2- years old will be checked as part of the Texas vehicle inspection program.
  • The purpose of this course is to familiarize potential vehicle inspectors with the OBD II systems and what it means when a vehicle fails the OBD II inspection.
  • OBDII systems monitor all components that affect vehicle emissions. OBD II systems detect and record malfunctions of these components, often before the motorist becomes aware of any problem.
  • The OBD II inspection consists of checking the results of the self-tests that have occurred while the vehicle was driven prior to the time of inspection.
  • The vehicle does not have to be warmed-up to perform an OBD II inspection.
  • This course addresses:

 Air quality in Texas – Why are we concerned about vehicle pollution?  The Texas OBD II Inspection Procedure

OBD II Testing : Ozone

OBD II Inspection

OBD II systems monitor all components that affect vehicle emissions.

OBD II systems detect and record malfunctions of these components, often before the motorist becomes aware of any problem.

The OBD II inspection consists of checking the results of the self tests that have occurred while the vehicle was driven prior to the time of inspection.

The vehicle does not have to be warmed up to perform an OBD II emissions inspection.

GVWR Examples

OBD II Connector from a Worldwide Analyzer

ESP Wireless OBD connector