WARNING GP-OVERLOAD 1325096 - Caterpillar

Table 1
J1939 Code and Description CDL Code and Description Comments
N/A 246-9
Proprietary CAN Data Link : Abnormal Update Rate The Electronic Control Module (ECM) has lost all communications with the transmission ECM over the Cat Data Link.
The code is logged.
The check engine lamp is illuminated.
639-9
J1939 Network #1 : Abnormal Update Rate 247-9
SAE J1939 Data Link : Abnormal Update Rate The ECM has lost all communications with the implement ECM over the Cat Data Link.
The code is logged.
The check engine lamp is illuminated.
N/A 248-9
Cat Data Link not communicating The Implement ECM will not be able to receive/send proper signal information with other ECM modules.
The code is logged.
N/A 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.
N/A 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.
1231-9
J1939 Network #2 : Abnormal Update Rate 2348-9
SAE J1939 Data Link #2 : Abnormal Update Rate The ECM has lost all communications over the local CAN data link.
The code is logged. Note: This procedure checks for an open or for a short in the data link circuits.If Caterpillar Electronic Technician (ET) will not communicate with the ECM, refer to Troubleshooting, "Electronic Service Tool Does Not Communicate" before you begin this procedure. The procedure will verify that electrical power is being supplied to the ECM and to the service tool connector.The data links are used to communicate information between the engine ECM and other control modules that are a part of the application. Cat ET also communicates with the ECM via the data links.The service tool connector contains connections for electrical power and for the data links.When the keyswitch is in the OFF position, Cat ET may communicate with the ECM. However, the communications may be disrupted and the communications may require frequent reconnection. To avoid this problem, place the keyswitch in the ON position when Cat ET is being used.Cat ET may display the following error message:"The version of the ECM is not recognized and the integrity of the changed parameters and displayed data is not guaranteed."This message indicates that one of the following conditions exist:
The flash file in the ECM is newer than the version of Cat ET.
The latest version of Cat ET has not been installed.
Illustration 1 g02138795
Schematic for the Cat Data Link
Table 2
Troubleshooting Test Steps Values Results
1. Check for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Thoroughly inspect the connectors that are associated with the data link circuits. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Disconnect the J1/P1 ECM connectors.
D. Disconnect Cat ET from the service tool connector.
Open Circuit
Result: Each check of the resistance indicates an open circuit.
Proceed to Test Step 2.
Result: At least one check of the resistance does not indicate an open circuit. There is a short circuit in the harness or in a connector.
Repair: Repair the connectors and/or the wiring. Replace parts, if necessary.
If the problem is not resolved,