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5.13
J1939 Diagnostic Trouble Code (DTC) Display
This section applies for electronic generators only (i.e. generators that use J1939)
The GSC400 can read J1939 diagnostic trouble codes (DTCs) from an electronic ECM, if
enabled (see section 6.1.3 on page 53 for information on how to configure and customize
the GSC400 DTC feature).
5.13.1
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
Failure Mode Indicator - The type of failure. You must refer to the engine
manufacturer’s documentation to identify the meaning of the failure mode
indicator number.
OC
Occurrence Count - Identifies the number of times the failure has occurred.
SPN
Suspect Parameter Number - 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 look at follows.
Figure 7 – Single Active DTC message
Summary of Contents for GSC400 Series
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