ENGINE AR 1172680 - Caterpillar

Problem-Intermittent GPS Information Availability on J1939 or Cat Datalink
Probable Cause
Verify that the GPS module is configured for 4800 baud rate, 8 data bits, no parity and 1 stop bit.
Observe the "GPSIM Statistics" screen in the service tool status screens. Confirm that GPS messages are regularly being received by the PL1000T. If the statistics do not regularly increment, then the data is not being reliably transmitted by the GPS device. Refer to this documentation for the device in order to troubleshoot the lack of consistently updated data.
Confirm the GPS module is located in a position that gives it a clear view to the sky. Obstructions could cause infrequent GPS calculations resulting in intermittently updated GPS data.
If available, use an additional GPS device to confirm there are a sufficient number of satellites within view of the GPS module. An insufficient number of viewable GPS satellites can cause infrequent GPS calculations resulting in intermittently updated GPS data.Problem-No GPS Information Available on Cat Datalink or J1939
Probable Cause
Confirm the "GPSIM Enable Status" is set to "Enabled".
Observe the "GPSIM Statistics" screen in the service tool status screens. Confirm that the PL1000T is regularly receiving GPS messages. If these statistics do not regularly increment, then the GPS device is not reliably transmitting the data. Refer to the documentation for the device to troubleshoot the lack of consistently updated data.
If troubleshooting procedures for the GPS device indicate no problems with that device, then the system harnessing should be analyzed and repaired.Problem-GPS Information Available on CatData Link but not J1939
Probable Cause
Verify that the GPS module is configured for 4800 baud rate, 8 data bits, no parity and 1 stop bit.
GPS information availability on CatData Link indicates that the GPSIM feature is properly enabled. The system harnessing should be analyzed and repaired.