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Schematic for the Cat Data LinkTest Step 1. Inspect the Electrical Connectors and the Wiring
Remove the electrical power from the ECM.
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Left side engine view (typical example) (1) J60 service tool connector (2) J1/P1 ECM connectors (3) J61 customer connector
Thoroughly inspect connectors (1), (2), and (3). Inspect all of the other connectors that are associated with the circuit for the Cat Data Link.Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
Verify that the wiring for the Cat Data Link is installed correctly. Refer to Special Instruction, REHS1187, "Electronic Installation Guide".
Verify that each individual ECM is programmed to the proper engine location.
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P1 terminals that are associated with the Cat Data Link (P1-8) Cat Data Link + (P1-9) Cat Data Link −
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Terminals on the service tool connectors that are associated with the Cat Data Link (D) Cat Data Link + (E) Cat Data Link −
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Terminals on the customer connectors that are associated with the Cat Data Link (6) Cat Data Link + (7) Cat Data Link −
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the Cat Data Link.
Check the allen head screw on each ECM connector and on the customer connector for the proper torque. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
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 wiring appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or the wiring.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. Check for a Short Circuit
Remove the electrical power from the ECM.
Disconnect any service tools from the Cat Data Link.
Disconnect the P1 and P2 connectors from the ECM.
Measure the resistance between the points that are listed in Table 1. Be sure to wiggle the wires in the harnesses as you make each resistance measurement.
Table 1
Resistance Measurements for the Wiring Harness    
Connector and Terminal    Terminal    
P1-8 (Cat Data Link +)     All of the other terminals on the P1 connector    
All of the terminals on the P2 connector
Engine ground
P1-9 (Cat Data Link −)     All of the other terminals on the P1 connector    
All of the terminals on the P2 connector
Engine ground Expected Result:All of the resistance measurements indicate an open circuit.Results:
OK - All of the resistance measurements indicate an open circuit. Proceed to Test Step 3.
Not OK - At least one resistance measurement does not indicate an open circuit. There is a problem with a wiring harness. There may be a problem with a connector.Repair: Repair the wiring and/or the connector. Replace parts, if necessary. Verify that the problem is resolved.STOPTest Step 3. Check for an Open Circuit
Remove the electrical power from the ECM.
Use a jumper wire to create a short circuit between terminals P1-8 and P1-9.Note: Wiggle the harness during the following measurements in order to reveal any intermittent short condition.
Measure the resistance between the terminals for the Cat Data Link at the service tool connectors.Expected Result:Each resistance measurement is less than ten Ohms.Results:
OK - Each resistance measurement is less than ten Ohms. There is not an open circuit.Repair: The problem may be intermittent. If the problem is intermittent, refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - At least one resistance measurement is greater than ten Ohms. The wiring for the Cat Data Link has excessive resistance. There may be a problem in a connector.Repair: Repair the wire and/or the connector, when possible. Replace parts, if necessary. Verify that the problem is resolved.STOP