HOSE ASSEMBLY 5K6306 - Caterpillar

Illustration 3 g06320023
Schematic for the local CAN data link (A5 ECM)
Illustration 4 g02725316
Schematic for the global CAN data link 1 (primary ECM)
Illustration 5 g02725346
Schematic for the global CAN data link 2 (secondary ECM)
Table 2
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
Note: Carefully follow this procedure in order to identify an intermittent problem.
A. Perform a visual inspection of the wiring between the P1 and P2 ECM connectors, the termination resistors, the service tool connector, all of the control box connectors, and the connectors at various controllers.
- 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
Results: The wiring and the connectors appear to be OK.
Proceed to Test Step 2
Results: There is a problem with the wiring or with a connector.
Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the connector seals are properly in place and ensure that the connectors are coupled. Verify that the problem is resolved.
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. Try to establish communication between Cat ET and the ECM.
Data link
Results: Cat ET and the ECM communicate.
Repair Cat ET and the ECM communicate when the bypass harness is installed. However, communication cannot be established via the engine wiring.
Disconnect the electrical connector from each of the control modules that is on the data link one at a time. This test will isolate the problem. Try to establish communication between Cat ET and the ECM after disconnecting each module.
The problem is in the control module if disconnecting the module allows Cat ET and the ECM to communicate. If a module is suspect, replace the module. Verify that the problem is resolved.
The control module is OK if the problem remains when the module is disconnected.
Results: ET and the ECM do not communicate.
Repair Communication between Cat ET and the ECM is not established when the bypass harness is installed. Temporarily connect a test ECM. Refer to Troubleshooting, "Test ECM Mode". Verify that the problem is resolved.
Connect the original ECM and verify that the problem returns. Before you consider permanently replacing the ECM, consult with the Dealer Solutions Network (DSN).
3. Check the Wiring for the Data Links for a Short Circuit
A. Turn the power disconnect switch to the OFF position.
B. Disconnect the negative cable from the battery.
C. Disconnect the P1 and P2 ECM connectors from the primary ECM.
D. Measure the resistance between the following terminals at the primary ECM:
-P1-8 (Cat Data Link +) and P1-61 (-Battery)
-P1-9 (Cat Data Link -) and P1-61 (-Battery)
-P1-34 (Global CAN data link -) and P1-61 (-Battery)
-P1-50 (Global CAN data link +) and