This guide provides a summary of pass/fail standards for the OBD test portion of a Smog Check inspection and instructions for inspecting vehicles with known OBD test difficulties using a Gm Test Equipment Obdii Scanner.
OBD Test Overview and Pass/Fail Standards
The On-Board Diagnostic (OBD) test is a crucial part of Smog Check inspections. A gm test equipment obdii scanner is used to assess vehicle emissions and ensure compliance with environmental regulations. This test relies on readiness monitors, self-tests performed by the vehicle’s OBD system. These monitors verify the functionality of emission control components.
Readiness Monitor Standards
The number of incomplete readiness monitors allowed for a passing OBD test varies by vehicle model year and fuel type:
- 1996-1999 (Gas): Any one incomplete monitor is allowed (excluding continuous monitors).
- 2000 and newer (Gas): Only the evaporative system monitor can be incomplete (excluding continuous monitors).
- 1998-2006 (Diesel): No incomplete monitors are allowed.
- 2007 and newer (Diesel): Only the Particulate Filter and Non-Methane HydroCarbon (NMHC) monitors can be incomplete.
Malfunction Indicator Lamp (MIL) Standards
The MIL, or “Check Engine” light, must function correctly for a passing OBD test:
- Pass: MIL illuminates when the key is on and the engine is off (KOEO) and turns off when the engine is running (KOER).
- Fail: MIL does not illuminate during KOEO or illuminates during KOER.
Communication Standards
The vehicle must communicate with the gm test equipment obdii scanner:
- BAR-97: Vehicle communicates with the BAR-97 system.
- OIS: Vehicle communicates with the OIS system and transmits required data (e.g., MIL status, DTCs, monitor status).
Permanent Diagnostic Trouble Code (PDTC) Standards
For 2010 and newer vehicles, the presence of a PDTC results in a failing OBD test, unless specific conditions are met (e.g., completion of sufficient warm-up cycles and mileage since last OBD information clearing). A gm test equipment obdii scanner can read and identify these codes.
Modified Software Standards
Vehicles with illegally modified software will fail the Smog Check inspection. Software approved by the California Air Resources Board (CARB) is acceptable.
Vehicles with Known OBD Test Issues
Certain vehicles have known issues with the OBD test. These issues range from communication problems to incomplete readiness monitors. Using a gm test equipment obdii scanner in conjunction with this guide can assist in diagnosing these issues. Consult Section D of the original document for a detailed list of affected vehicles and troubleshooting instructions. This section includes information on specific makes, models, years, and engine types known to have issues with the OBD test.
Conclusion
Understanding the OBD test standards and common vehicle issues is essential for conducting accurate Smog Check inspections. A reliable gm test equipment obdii scanner provides the necessary data to diagnose and resolve emission-related problems, ensuring vehicle compliance with regulations. Always refer to the latest official documentation from the Bureau of Automotive Repair (BAR) for the most up-to-date information and guidance.
