0396725 JOHNSON IMPELLER ASSY.

Table 1
Diagnostic Codes
J1939 Code and Description Conditions which Generate this Code System Response
639-9
J1939 Network #1 : Abnormal Update Rate Communication issue on the Global data link between the generator and the ISM. One module is no longer broadcasting. The code is logged.
1231-9
J1939 Network #2 : Abnormal Update Rate Communication issue with the fuel valve and the ISM on the CAN data link. The code is logged.
1231-14
J1939 Network #2 : Special Instruction All communications on the data link have been lost. All communications on the data link have been lost.
2241-9
Source Address 241 : Abnormal Update Rate The engine ECM is not communicating with the ISM. All communications on the data link have been lost.
2452-9
Generator Total Real Power : Abnormal Update Rate Communication issue on the Global data link between the ECM and the EMCP. One module is no longer broadcasting. The code is logged.
Gas substitution shuts off. Note: If the only active code is 2452-9, troubleshoot the customer supplied load feedback signal. Refer to Application & Installation Guide, LEBW0026 for additional information.Use this procedure to troubleshoot the electrical system if a problem is suspected with the CAN data link or the Cat Data Link.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 one of the following conditions:
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 g03383096
Illustration 2 g01444702
Terminal locations at the service tool connector
(A) +Battery
(B) −Battery
(C) CAN data link global shield
(D) Cat Data Link +
(E) Cat Data Link −
(F) CAN data link global −
(G) CAN data link global +
Illustration 3 g03383124
Terminal locations at the P1 ECM connector that are for the data links
(P1-8) Cat Data Link +
(P1-9) Cat Data Link −
(P1-34) Global CAN data link −
(P1-42) Global CAN shield
(P1-50) Global CAN data link +
(P1-52) +Battery
(P1-53) +Battery
(P1-55) +Battery
(P1-57) +Battery
(P1-61) −Battery
(P1-63) −Battery
(P1-65) −Battery
(P1-67) −Battery
(P1-69) −Battery
(P1-70) Keyswitch
Illustration 4 g01326307
Terminal locations at the P2 ECM connector that are for the data link
(P2-11) Local CAN data link −
(P2-12) Local CAN data link +
(P2-23) Local CAN shield
Illustration 5 g03325860
Terminal locations at the P1 ISM connector that are for the data link
(P1-48) Global CAN data link −
(P1-49) Global CAN shield
(P1-50) Global CAN data link +
(P1-51) Local CAN data link −
(P1-52) Local CAN shield
(P1-61) Local CAN data link +
(P1-66) −Battery
(P1-67) −Battery
(P1-68) + Battery
(P1-69) + Battery
(P1-70) Keyswitch
Illustration 6 g01355248
Terminal locations at the termination resistors
(A) CAN data link +
(B) CAN data link −
(C) Shield
Table 2
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
Note: Carefully follow this procedure to identify an intermittent problem.
A. Perform a visual inspection of the wiring between the P1 and P2 ECM connectors, the termination resistors, and the service tool connector. Also, inspect the wiring and the connectors at various controllers and control boxes.
Look for these problems:
-Harness damage that is caused by chafing
- Harness damage that is caused by excessive heat
-Look for moisture on the wiring and in the connectors.
- Pull on the wires that are associated with the data links.
This test verifies that the wire is properly crimped to the terminal and that the terminal is properly inserted into the connector.
Connectors
Result: The wiring and the connectors appear to be OK.
Proceed to Test Step 2.
Result: There is a problem with the wiring or with a connector.
Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all the connector seals are properly in place and ensure that the connectors are coupled.
Verify that the repair eliminates the problem.
2. Bypass the Wiring for the Data Link
A. Connect the 217-0113 Wiring Harness (ECM BYPASS) to the J1 connector, to the 332-7381 Data Link Cable As, and to the battery.
B. Restore the electrical power to the ECM.
C. Try to establish communication between Cat ET and the ECM.
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