Indicator Lamp (MIL) illuminates and how the code erase procedure is managed.
Different vehicle manufacturers implement these priorities in various ways, leading
to differences in how codes are ranked and addressed across different makes and
models.
5.5.1.1 Stored Codes
Stored codes refer to current emission-related DTCs from the vehicle's ECM. OBD-II
codes are prioritized based on their emission severity, with higher priority codes
overriding lower priority ones. The priority of the code determines whether the MIL
is illuminated and how the code erase procedure is handled. Vehicle manufacturers
implement this ranking differently, leading to variations between makes.
5.5.1.2 Pending Codes
The purpose of this function is to enable the Diagnostic 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.
Use this function following a vehicle repair and code clearing procedure to verify test
results after a single drive cycle.
● If a test failed during the drive 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.
● Test results reported by this function do not necessarily indicate a faulty
component or system. If test results indicate another failure after additional
driving, then a DTC is set to indicate a faulty component or system, and the MIL is
illuminated.
5.5.1.3 Permanent Codes
This option displays a record of any "Permanent" codes. A permanent status DTC is
one that was severe enough to illuminate the MIL at some point, but the MIL may
not be on at the present time.
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