This information refers to Domestic and Export calibration
packages. Use the DTCs that only apply to your specific Regular Production
Option (RPO). 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
| • | 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-OBD2 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 Type X DTC has been
disabled, 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.
