California Air Resources Board

When performing compliance tests on non-OBD vehicles, a credentialed tester must use a SAE J1667-compatible smoke meter to conduct the smoke opacity test. Another component of the Clean Truck Check compliance test for non-OBD vehicles is the visual inspection. Credentialed testers must submit NON-OBD test results through their CTC-VIS tester account. 

To obtain information on smoke meter manufacturers that have declared that their meters meet the SAE J1667 specifications, visit Smoke Meter Manufacturers. It is the responsibility of a credentialed Tester to coordinate with a smoke meter manufacturer to ensure that their specific smoke meter model is SAE J1667-compatible. Please refer to the Snap-acceleration smoke test procedure for Heavy-Duty Diesel-powered vehicles