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Diesel smog check information

New California Diesel Smog Check

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:

  1. Visual Test
  2. OBD II Test
  3. Visible Smoke Test

.Visual Check:

  1. Crankcase Depression Regulator CDR) or Positive Crankcase Ventilation (PCV)
  2. Diesel Oxidation Catalyst (DOC)
  3. Diesel Particulate Filter (DPF)
  4. Nox Absorber
  5. EGR
  6. Fuel Injection
  7. Temperature and Pressure Sensors
  8. Wiring of Sensors/Switches/Computers
  9. Vacuum Line Connections to Sensor/Switches
  10. Other Diesel Emission-Related Components: Turbo/Supercharger, Exhaust/Intake, etc.

.OBD II Check:

  1. "Check Engine Light" (MIL) is Operational
  2. MIL on/off
  3. OBD Readiness Status Codes

Visible Smoke Test:

  1. Idle Test
  2. Idle Crankcase (CDR/PCV) Test
  3. Snap 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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