Nexas NexLink NL102PLUS User Manual page 17

5.1.1 Read DTC
This option is used to read the current activated or historical activated trouble
codes.
Generally, there are three elements for one J1939 DTC (See Figure 5-7):
 Suspect Parameter Number (SPN) – Indicates what function on the ECU has
failed.
 Failure Mode Indicator (FMI) – Indicates in what way the function failed.
 Occurence (OC) – Indicates the occurence times of the current DTC.
Further descriptions
on current DTC
Whereas, if we choose [J1587/1708], the fault code includes:
 Subsystem Identifier (SID) – Indicates what function on the ECU has failed.
 Failure Mode Indicator (FMI) – Indicates in what way the function failed.
 Occurence (OC) – Indicates the occurence times of the current DTC.
NexLink NL102PLUS User Manual
Figure 5-6
Figure 5-7
14
Indicates there are
total 8 codes and
SPN0100 is the first
code to display.