iCarsoft HD V3.0 - Dtcs for J1587;J1708 and J1939

Heavy Duty & OBDII Diagnostic Tool HD V3.0
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Figure 2-1
2.2.2 DTCs for J1587 /J1708 and J1939
This section explains the basic elements of fault codes for J1587 / J1708
and J1939 data bus protocols, how to view these codes on HD V3.0, and
what they mean. Each fault code on HD V3.0 contain three distinct pieces of
information, as described below.
J1587 /J1708 fault codes consist of the following, in this order:
 Subsystem Identifier (SID) – Indicates what function on the ECU has
failed.
 Failure Mode Indicator (FMI) – Indicates in what way the function
failed.
 Occurrence (OC) – Indicates the occurrence times of fault codes.
J1939 fault codes consist of the following, in this order:
 Suspect Parameter Number (SPN) – Indicates what function on the