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ECM expects the speed update to be sent continuously and if it is not the ECM thinks
there is a problem with the J1939 communications.
6.1.3 Diagnostic Trouble Codes (DTCs)
The GSC400 has a DTC feature that when enabled allows the controller to receive
currently active DTCs (DM1) messages and display then on the screen as well as
optionally store then to the Event Log. The controller can also receive previously active
(DM2) messages and display them on user command. DM2 messages are intended for
technician troubleshooting and are not stored to the Event Log.
The GSC400 supports the following J1939 standards when reading DM1 messages:
1. Single package frame J1939-71
2. Multi-packages frame J1939-21
a. BAM
b. TP.DP
The GSC400 supports the following J1939 standards when reading DM2 messages:
1. DM2single package frame J1939-71
2. Multi-package frame J1939-21
a. BAM
b. RTS/CTS
c. TP.DP
The user can enable/disable the DTC feature and configure its behavior with the
following settings.
DTC DISPLAY – This setting enables or disables active fault messages (DM1)
monitoring. When the DTC DISPLAY feature is enabled the GSC400 can receive active
faults in the RUNNING, OFF and AUTO modes on the J1939 bus. Any new received
active faults will trigger a message "NEW ACTIVE DTC" and the user can read the
message on the GSC400 front panel display. This new message will also be stored into
the controller’s event log if this feature was enabled.
ACTIVE LOG DTC - The setting enables/disables the storing of active faults (DM1) in
GSC400 Event Log. The Event Log reserves 30 storage locations for DM1 messages.
READ STORED DTC – The setting enables/disables the ability to request stored fault
codes from the ECM (DM2). When this setting is enabled the GSC400 will allow
manually triggered requests of stored faults from the ECM’s memory (DM2).
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