3E0-77076-0 Tohatsu BUSHING, 18 - 20 - 20.5

Table 1
Diagnostic Codes Table
CDL Code J1939 Code Code Description
(code descriptions may vary) 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.
639-9 639-9 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 4783-9 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 5591-9 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 ECMIf 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 +