This information refers to Domestic and Export calibration
packages. Use the diagnostic trouble codes (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 individual running and
setting criteria of the DTC.
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.
