If you are using the on-board functions, after it displays codes, it will give you the option to clear codes. Either by respective module, or all modules at once.
Diagnostic Trouble Code (DTC) Type Definitions
This information refers to domestic and export calibration packages. Use the DTCs that only apply to your specific RPO (regular production option). Each DTC is directly related to a diagnostic test. The DTC sets based upon the DTCs individual running and setting criteria.
The following are the types of DTCs and their code characteristics:
Type A
Emissions related
Requests illumination of the MIL on the first trip with a fail
Stores a history DTC on the first trip with a fail
Stores a Freeze Frame on the first trip with a fail
Stores a Failure Record
Updates the Failure Record the first time the test fails each ignition cycle
Type B
Emissions related
The code is enabled after the first trip with a fail
The code is disabled if the second consecutive trip passes
Requests illumination of the MIL on the second consecutive trip with a fail
Stores a history DTC on the second consecutive trip with a fail
Stores a Freeze Frame on the second consecutive trip with a fail
Stores a Failure Record when the first test fails
Updates the Failure Record the first time the test fails each ignition cycle
Type C1
Non-emissions related
Requests illumination of the service lamp (not the MIL), or the service message on the first trip with a fail
Stores a history DTC on the first trip with a fail
Does not store a Freeze Frame
Stores a Failure Record when the test fails
Updates the Failure Record the first time the test fails each ignition cycle
Type C0
Non-emissions related
Does not request illumination of any lamps
Stores a history DTC on the first trip with a fail
Does not store a Freeze Frame
Stores a Failure Record when the test fails
Updates the Failure Record the first time the test fails each ignition cycle
Type X
Diagnostics that are coded in the software, but will not run for non-OBD?II export vehicles
Some domestic vehicles use DTCs
Even though codes are not stored, the DTC type table can still be used as a resource when diagnosing problems with systems that are associated with the type X DTCs
If a system is malfunctioning and the associated DTC has been disabled (type X), it may be beneficial to use the diagnostic table as a guide to aid in diagnosis. Many of the DTC tables include a functional check of the system that may pinpoint a problem. However, it is important to remember that the DTC tables are specifically designed for use only when a DTC is set. Therefore, a thorough understanding of the normal operation of the system being diagnosed is necessary and use of the tables for this purpose is at the discretion of the technician.
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Tuesday, December 13th, 2011 AT 8:55 PM
