Dtcs For J1587/J1708 And J1939 - LAUNCH TECH CRP 429HD User Manual

LAUNCH
CRP 429HD User's Manual
provide additional information on where the DTC originated and the operating
conditions that caused it to set. Here below is an example to illustrate the
structure of the digits:
EN

2.3.2 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 CRP 429HD HD, and
what they mean. Each fault code on CRP 429HD HD 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.
• Occurence (OC) – Indicates the occurence times of fault codes.
J1939 fault codes consist of the following, in this order:
• Suspect Parameter Number (SPN) – Indicates what function on the ECU has
failed.
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