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OBD Direct Operations OBD Health Check
Figure 6-2 Sample OBD Health Check menu
6.1.1 Global OBD II Code Check
This option displays any stored emission related generic DTCs reported by the ECM. Selecting
this option opens a submenu with two choices: Codes and Pending Codes.
Select an option to display the code list. Refer to "Codes Menu‚" on page 37 and the Global OBD
Vehicle Communication Software Manual for additional information.
Codes
The Codes option displays a list of current emission related DTCs.
OBD-II/EOBD Codes have a priority according to their emission severity, with higher priority codes
overwriting lower priority codes. The priority of the code determines the illumination of the MIL and
the code erase procedure. Vehicle manufacturers have implemented the ranking differently, so
there will be differences between makes.
Pending Codes
The purpose of this service is to enable the scan tool to obtain “pending” or maturing diagnostic
trouble codes. These are codes whose setting conditions were met during the last drive cycle, but
need to be met on two or more consecutive drive cycles before the DTC actually sets.
The intended use of this service is to assist the service technician after a vehicle repair and after
clearing diagnostic information, by reporting test results after a single driving cycle.
• If a test failed during the driving cycle, the DTC associated with that test is reported. If the
pending fault does not occur again within 40 to 80 warm-up cycles, the fault is automatically
cleared from memory.
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