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4.12 J1939 Diagnostic Trouble Code (DTC) Display
This section applies for electronic generators (i.e. generators that use J1939)
which have the DTC feature enabled.
The GSC400 can read J1939 diagnostic trouble codes (DTCs) from an electronic
ECM, if enabled (see section 4.1.3 on page 65 for information on how to
configure and customize the GSC400 DTC feature).
4.12.1 DM1 Messages
When the engine’s ECM detects a fault, it will send an Active Diagnostic Trouble
Code, DM1, message. The DM1 message sent by the ECU will also contain
information on the type of fault as well as the number of occurrences for the fault.
If multiple DTCs are present, each will be transmitted over the J1939 network.
When the DM1 messages are received by the GSC400 controller there are 3
important pieces of information that are captured and displayed:
FMI UFailure Mode IndicatorU - The type of failure. You must refer to the
engine manufacturer’s documentation to identify the meaning of the
failure mode indicator number.
OC UOccurrence CountU - Identifies the number of times the failure has
occurred.
SPN USuspect Parameter NumberU - The parameter number.
If one of these DTCs appears, please consult your engine manufacture for the
definition of this fault. With some engine manufacturers, the text of the message
can also vary slightly between engine types.
When active DTC messages are being received this will cause the controller
display to lock and display the messages. If multiple active DTCs are received
the controller will scroll and display each DTC message. The time between
scrolling will be 3 seconds. The DTC message display will appear as follows.