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Schematic for the Cat Data Link
Test Step 1. INSPECT THE ELECTRICAL CONNECTORS AND THE WIRING
Remove the electrical power from the ECM.
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Engine view (typical example)
(1) J1/P1 ECM connectors
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Engine view (typical example)
(2) J61/P61 Customer connectors
(3) J60/P60 Service tool 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 Troubleshooting, "Electrical Connectors - Inspect" for details.
Verify that the wiring for the Cat Data Link is installed correctly. Refer to Special Instruction, REHS1187, "Electronic Installation Guide" for additional information.
Check the following components for abrasion, for corrosion, or for incorrect attachment.
Global Positioning System Interface Module (GPSIM)
Engine Vision Interface Module (EVIM)
Engine Vision Display (EVD)Ensure that the 163-3973 Cable As is securely connected to the EVIM and to the EVD.
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 customer connectors that are associated with the Cat Data Link
(6) Cat Data Link −
(7) 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 −
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 Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
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 THE WIRING AT EACH DISPLAY MODULE
Restore the electrical power to the ECM.
Measure the supply voltage between terminals B+ and B− at each interface module in order to verify that the modules are receiving the correct operating voltage.
Verify that each wire of the Cat Data Link is connected to the correct terminal on each interface module. Expected Result:The voltage measurement at each interface module is between 11.0 VDC and 13.5 VDC for a 12 volt system and between 22.0 VDC and 27.0 VDC for a 24 volt system. The wires for the Cat Data Link are connected correctly.Results:
OK - The wiring at each module is installed correctly. Proceed to Test Step 3.
Not OK - The wiring at a module is not installed correctly.Repair: Make the necessary repairs. Verify that the repair eliminates the problem.STOPTest Step 3. CHECK FOR A SHORT CIRCUIT
Remove the electrical power from the ECM.
Disconnect the wiring for the Cat Data Link from the EVIM and the GPSIM.
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 4.
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 4. CHECK FOR AN OPEN CIRCUIT
Remove the electrical power from the ECM.
Disconnect the P1 ECM connector.
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 connector for each of the modules. 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. C