User Manual

NexLink NL102 User Manual
14
Figure 5-6
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.
Figure 5-7
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.
Further descriptions
on current DTC
Indicates there are
total 8 codes and
SPN0100 is the first
code to display.