Approval Details

Valid E.O.


This Executive Order approved the specified parts on on March 24, 1999.
As of Saturday, April 20th, 2024 this Executive Order has not been overturned or superceeded.

Approved Parts

1985-1993 model-year Detroit Diesel Corporation (DDC) 6V92TA DDEC two-stroke urban bus diesel engines with power ratings of 253 and 277 horsepowerThe CCT Upgrade Kit includes patented engine camshafts, CCT cylinder kits, CEM II catalytic muffler, and 0.015 offset key to retard fuel injection timing. For 1985-1987 model-year engines, the CCT Upgrade Kit also includes DDEC I to DDEC II conversions parts, fuel injectors, turbocharger, blower assembly, blower bypass valve, 40-tooth blower drive gear, and an ECM upgrade. For 1988-1990 model-year engines, the CCT Upgrade Kit also includes fuel injectors and an ECM upgrade. For all of the applicable engines, DDC's revised certification word codes listed in Attachment A must be used.

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-393-2
  • Executive Order 393-2 / D393-2
  • ARB # D-393-2
  • Executive Order No: D-393-2
  • C.A.R.B. No. D-393-2
  • Resolution D-393-2
For Free CARB Executive Order Status verification, email an image of the device Executive Order label as well as the Year/Make/Model and Test Group # of the vehicle to [email protected]

Download: Executive Order D-393-2 PDF

D-393-2 Document:

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