Diagnostic Trouble Code (DTC) Type Definitions for Buick Century (China) 2000
This information refers to domestic and export calibration
packages. Use the DTCs that only apply to your specific regular production
option (RPO) . Each diagnostic trouble code (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
| • | Requests illumination of the malfunction indicator lamp (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
| • | 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
| • | 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
| • | 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.
