SHANK-RIPPER 1380797 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with the CAN data link. Also use this procedure if a diagnostic code in Table 1 is active or easily repeated.Note: Some of the following codes may not be applicable for certain applications.
Table 1
Diagnostic Trouble Codes
CDL Code Code 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.
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.
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.
1603-9 Machine Control Module : Abnormal Update Rate The code is logged.
3243-9 Water Pump Control Module : Abnormal Update Rate The ECM has lost all communications with the water pump control module.
The code is logged. If the 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 verifies 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. In order 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 g02112358
Schematic for the Cat Data Link and the CAN data link
Illustration 2 g01672679
Terminal locations at the service tool connector
(A) +Battery
(B) −Battery
(C) CAN shield
(D) Cat Data Link +
(E) Cat Data Link −
(F) CAN data link −
(G) CAN data link +
Illustration 3 g01672676
Terminal locations at the P1 ECM connector that are for the data link
(P1-8) Cat Data Link +
(P1-9) Cat Data Link −
(P1-34) CAN data link −
(P1-42) CAN shield
(P1-48) +Battery (if applicable)
(P1-50) CAN data link +
(P1-52) +Battery (if applicable)
(P1-53) +Battery (if applicable)
(P1-61) −Battery (if applicable)
(P1-63) −Battery (if applicable)
(P1-65) −Battery (if applicable)
(P1-70) Keyswitch
Illustration 4 g02078636
P2 ECM connector
(P2-11) CAN data link −
(P2-12) CAN data link + Test Step 1. Check for a Short Circuit
Turn the keyswitch to the OFF position.
Thoroughly inspect the connectors that are associated with the data link circuits. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Disconnect the P1 and the P2 ECM connector.
Disconnect Cat ET from the service tool