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COVER 2H9831 - Caterpillar



2H9831 COVER Caterpillar parts COVER
Rating:
11
Alternative (cross code) number:
CA2H9831
2H-9831
2H9831
Caterpillar 2H9831 COVER
Weight: 0.65 pounds 0 kg.

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The CAN data link is used to communicate information between the Electronic Control Module (ECM) and other modules. Use this procedure to troubleshoot any suspect problems with the CAN data link.The test steps that are described in this test can help solve the following problems.
Faulty connectors
Missing termination resistors
Short circuits
Open circuits
Illustration 1 g01269477
Typical schematic for the CAN data link
Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove the electrical power from the ECM.
Illustration 2 g01121169
Typical engine components for the CAN data link
(1) Connector for the electronic service tool
(2) Customer connector
(3) J1/P1 connectors
Thoroughly inspect connectors (1), (2), and (3). Thoroughly inspect the connectors for each module that is connected to the CAN data link. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
Illustration 3 g01269470
P1 terminals that are associated with the CAN data link
(P1-34) CAN data link −
(P1-50) CAN data link +
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the CAN data link.
Check the allen head screw on each ECM connector for the proper torque. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the allen head screw on the customer connector for the proper torque. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" for the correct torque value.
Check the wiring harnesses for abrasion, for corrosion and for pinch points. Expected Result:All connectors, pins and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The harness and the wiring appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem in the wiring harness.Repair: Repair the connectors and/or the wiring. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled. Verify that the problem is resolved.STOPTest Step 2. Verify the Proper Installation of the CAN Data Link
Disconnect any module that is connected to the CAN data link.
Disconnect the P1 connector and measure the resistance between terminals P1-50 (CAN data link +) and P1-34 (CAN data link -). Expected Result:The resistance is between 57 and 63 Ohms.Results:
OK - The resistance is between 57 and 63 Ohms.Repair: If the CAN data link is working properly at this time, there may be an intermittent problem. If the problem is intermittent, refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - The resistance is between 114 and 126. The terminating resistor is missing.Repair: Verify that two terminating resistors exist on the data link. One resistor must be located on each end of the data link. The engine is shipped with one terminating resistor that is installed between the ECM and the customer connector.Refer to the appropriate electrical schematic in order to determine the missing resistor. Replace the missing resistor. Verify that the problem is resolved.STOP
Not OK - The resistance is less than 57 Ohms. Proceed to Test Step 3.
Not OK - The resistance is


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