Inspection Info - Description of the Tests
On-Board Diagnostic (OBD) Test
Eligible 1998 and newer light-duty vehicles receive a scan of the vehicle's built-in OBD monitoring system to ensure there are no defects with any of the vehicle's emissions control systems.
Read more about the OBD test procedure.
Watch a video describing the OBD test procedure.
IM240
1992 and newer vehicles (except diesels) are tested using the most advanced dynamometer test currently in use anywhere. The test measures emission levels for HC, CO, and NOx while the vehicle is driven over a pre-defined series of accelerations, decelerations, and cruise conditions. The test may last up to 240 seconds depending on how "clean" the vehicle is in the early part of the test.
Read more about the IM240 test procedure.
Watch a video describing the IM240 test procedure.
D147
Diesel vehicles (other than 1998 and newer light-duty vehicles) are tested using the D147 transient opacity test. This test measures smoke opacity levels while the vehicle is driven over a pre-defined series of accelerations, decelerations, and cruise conditions. The test may last up to 147 seconds depending on how "clean" the vehicle is in the early part of the test.
Read more about the D147 test procedure.
Watch a video describing the D147 test procedure.
ASM / Idle
1991 and older vehicles (except diesels) are tested using a steady-state dynamometer test, but still uses a dynamometer to facilitate emissions measurement while driving. The test measures emission levels for HC, CO, and NOx while the vehicle is driven at a steady speed of 40 kph and again while the engine idles. The driving test may last up to 90 seconds depending on how "clean" the vehicle is in the early part of the test.
Read more about the ASM/Idle test procedure.
Watch a video describing the ASM/Idle test procedure.
Gas Cap Pressure Test
Most vehicles also receive a functional inspection of the gas cap to ensure that it does not allow fuel vapours to escape to the atmosphere.
Tampering Inspections
Most vehicles are also visually inspected to ensure that the most important emission control devices have not been tampered with.
