I Testing Elements >On-Board Diagnostics Inspection I Tips For Smooth Testing I
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On-Board Diagnostics Inspection
I Tips For Smooth Testing I
Testing Elements
On-Board Diagnostic (OBD) Inspection:
Vehicles that are 1996 and newer will receive an OBD inspection. Today's vehicles have OBD computers that monitor the vehicle's engine and emission control system. When the computer detects a malfunction, a light on the dashboard is illuminated and a code identifying the malfunction is stored in the computer for access by a repair technician. By identifying specific malfunctions, OBD enhances the repair industry's ability to diagnose and repair vehicles.
Check Engine Light Bulb Test: The inspector will perform an test to ensure that the vehicle's check engine light is functioning properly. This is accomplished by turning the ignition key to the on position without starting engine. The vehicle would fail this portion of the inspection if the check engine light does not illuminate.
Communications: The inspector will connect the testing equipment to the vehicle's onboard computer port (Diagnostic Link Connector). If the vehicle cannot communicate with the testing equipment, the vehicle will be rejected from further testing until this condition is corrected.
Readiness Monitors: If the communication is established with the vehicle computer, then the OBD test can proceed unless unset readiness monitors exceed the testing requirements. For 1996 - 2000 model year vehicles, a vehicle can have up to 2 readiness monitors unset; for 2001 and newer vehicles, only 1 readiness monitor can be unset. If the unset readiness monitors exceed the requirements, the vehicle will be rejected from further testing until this condition is corrected.
Check Engine Light Commanded On: If the vehicle's check engine light is commanded on due to an emission component that is not functioning properly, then the Diagnostic Trouble Codes (DTC) are recorded and provided to the motorist. The vehicle will fail this portion of the inspection if the check engine light is commanded on. The vehicle will need to be repaired and brought back for a reinspection.