SEAL GROUP 5M1177 - Caterpillar

Use this procedure to troubleshoot the electrical system if a problem is suspected with the CAN data link or the Cat Data Link. Also use this procedure if a diagnostic code in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table
CDL Code and Description Comments
246-9
Proprietary CAN Data Link : Abnormal Update Rate The Electronic Control Module (ECM) has lost communications over the CAN data link.
The code is logged.
The check engine lamp is illuminated.
247-9
SAE J1939 Data Link : Abnormal Update Rate The ECM has lost all communications over the global CAN data link.
The code is logged.
The check engine lamp is illuminated.
296-9
Transmission Control : Abnormal Update Rate The ECM has lost all communications with the transmission over the Cat Data Link.
The code is logged.
The check engine lamp is illuminated.
297-9
All Wheel Drive Control : Abnormal Update Rate The ECM has lost all communications with the all wheel drive over the Cat Data Link.
The code is logged.
The check engine lamp is illuminated.
562-9
Caterpillar Monitoring System : Abnormal Update Rate The ECM has lost all communications with the Cat Monitoring System over the Cat Data Link.
The code is logged.
The check engine lamp is illuminated.
596-9
Implement Control : Abnormal Update Rate The ECM has lost all communications with the implement control over the Cat Data Link.
The code is logged.
The check engine lamp is illuminated.
639-9
J1939 Network #1 : Abnormal Update Rate The Electronic Control Module (ECM) has lost communications over the J1939 data link.
The code is logged.
The check engine lamp is illuminated.
1603-9
Machine Control Module : Abnormal Update Rate The code is logged.
The check engine lamp is illuminated.
1639-2
Machine Security System Module : Erratic, Intermittent, or Incorrect The ECM has lost communications with the Machine Security System Module (MSSM) over the Cat Data Link.
The code is logged.
The check engine lamp is illuminated.
1639-9
Machine Security System Module : Abnormal Update Rate The ECM has lost all communications with the Cat Monitoring System over the Cat Data Link.
The code is logged.
The check engine lamp is illuminated.
3397-9
DPF #1 Soot Loading Sensor : Abnormal Update Rate The ECM has lost all communications with the DPF #1 Soot Loading Sensor over the Cat Data Link.
The code is logged.
The check engine lamp is illuminated.
3472-9
ARD Air Pressure Control System : Abnormal Update Rate The ECM has lost all communications with the ARD combustion air controller over the Cat Data Link.
The code is logged.
The check engine lamp is illuminated. Note: If a 1639-2 diagnostic code is active, verify that the following information is correct before proceeding with this procedure:
The part number of the flash software for the Machine ECM
The part number of the flash software for the Machine Security System ECM
The part number of the Machine ECM
The part number of the Machine Security System ECM
Illustration 1 g02112358
Schematic for the Cat Data Link and the CAN data link
Probable Causes
Short circuit
Open circuit
Termination resistorsRecommended Actions
Table 2
Troubleshooting Test Steps Values Results
1. Check for a Short Circuit
A. Turn the keyswitch to OFF.
B. Thoroughly inspect the connectors that are associated with the data link circuits. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Disconnect the