On January 1, 2010 California implemented the diesel smog program.
The new diesel smog test will include all 1998 and newer diesel powered vehicles under 14,000 GVWR. Diesel testing is implemented as a biennial program similar to the regular smog check program. Therefore qualifying vehicles will require a smog inspection every other year, upon change of ownership, and when brought into California from a different state.
Diesel Inspection Procedure Outlined:
OBD II Test
Visible Smoke Test
Crankcase Depression Regulator CDR) or Positive Crankcase Ventilation (PCV)
Diesel Oxidation Catalyst (DOC)
Diesel Particulate Filter (DPF)
Temperature and Pressure Sensors
Wiring of Sensors/Switches/Computers
Vacuum Line Connections to Sensor/Switches
Other Diesel Emission-Related Components: Turbo/Supercharger, Exhaust/Intake, etc.
.OBD II Check:
"Check Engine Light" (MIL) is Operational
OBD Readiness Status Codes
Visible Smoke Test:
Idle Crankcase (CDR/PCV) Test
During the Snap Test the technician will push the acclerator quickly fromthe idle position to 3000 rpm, the immediately release the pedal. On the third snap the technician will observe if there are any visible emission from the tail pipe.
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