HOSE (Inlet) 4N0325 - Caterpillar

This procedure covers the following diagnostic code:
247-09 SAE J1939 Data Link abnormal update rateThe CAN data link is used to communicate information between the Electronic Control Module (ECM) and the Electronic Modular Control Panel (EMCP). Use this procedure to troubleshoot any suspect problems with the CAN data link.This procedure identifies the following problems:
Faulty connectors
Missing termination resistors
Short circuits
Open circuits
Faulty control module
Illustration 1 g01201767
Schematic for the CAN data link
Test Step 1. Inspect the Electrical Connectors and the Wiring
Turn the battery isolator switch to the OFF position.
Illustration 2 g01186024
Location of the J1/P1 ECM connectors (typical left side engine view)
Thoroughly inspect the J1/P1 ECM connector. Inspect all of the connectors that are associated with the circuit. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 3 g01240928
P1 terminals that are associated with the CAN data link
(P1-34) CAN data link −
(P1-50) CAN data link +
Illustration 4 g01201923
Terminals at the service tool connector that are associated with the CAN data link
(G) CAN data link +
(F) CAN data link −
(H) CAN data link −
(J) 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 the EMCP.
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