Ecu tuning meaning verification#

(This suggests that certain 'piggyback' devices could skirt the test if they're not detected visually, as these inline tuners don't change the Cal ID or CVN.) Any aftermarket computer device, whether it's an ECU or an inline tuner, is required to carry an Executive Order number, or EO, that indicates it's been approved by CARB.ĬARB and BAR have yet to clarify what this new test procedure means for vehicles built before 1996 (i.e., pre-OBD), though the state requires all cars built after 1975 to pass the emissions test for their model year. The CVN is calculated based on how the car runs, using parameters studied by the ECU, with the number changing when the software is adjusted.Ĭalifornia's new test looks at the CVN and Cal ID figures in the ECU’s code to determine if anything is out of place. The Cal ID indicates which version of the software the car is running, similar to the iOS number in your iPhone.

Ecu tuning meaning verification#

Testing for compliance involves plugging into the car's ECU and checking for two pieces of data: The Calibration Identification, or Cal ID, and the Calibration Verification Number, CVN. If a car is running software that does not fall into these categories, it will fail the smog check, and can't be registered or renewed until the computer equipment is brought into compliance. Now, OBDII-equipped cars and trucks from 1996 or newer will be checked to make sure they're running factory software or a CARB-approved ECU tune.

Testing is not required on vehicles that are less than eight years old.Īs of July 19, 2021, BAR will expand this testing procedure beyond the standard visual inspection and tailpipe test. The tests impact all gasoline-powered passenger vehicles from 1976 onwards, and every diesel-powered passenger vehicle from 1998 or newer. In California, every registered vehicle has to pass a biennial smog check, which includes visual inspection of emissions equipment and a tailpipe test. California Will Start Testing for ECU Tunes.