CONTROL GP-WINCH 6Y2048 - Caterpillar

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Schematic diagram of the Cat Data Link #2
Thoroughly inspect the following connectors:
J1 connectors on each ECM
Terminals 296 and 297 inside each control panel
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Harness side of the P1 connectors for each ECM (P1-20) Cat Data Link #2- (P1-21) Cat Data Link #2+
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the Cat Data Link #2.
Check the terminal strips for corrosion and for mechanical failure.
Check the harnesses and the wiring for abrasion and for pinch points between the control panels.Expected Result:The connectors, pins, and sockets are connected properly. The terminal strips do not have corrosion or mechanical failure. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - The components are in good condition with proper connections. Proceed to Test Step 15.
Not OK - The components are not in good condition and/or at least one connection is improper.Repair: Perform the necessary repairs and/or replace parts, if necessary.STOPTest Step 15. Check the Wiring for an Open Circuit
Disconnect the J1 connector from each ECM.
Measure the resistance between the points that are listed in Table 5. During each measurement, wiggle the wires in the harness in order to check for an intermittent problem. Be sure to wiggle the wires near each of the connectors.
Table 5
Resistance Measurements for the Cat Data Link #2    
Connector and Terminal for the Master ECM    Connector and Terminal for the Slave ECM    
J1-20 (Cat Data Link #2-)     J1-20 (Cat Data Link #2-)    
J1-21 (Cat Data Link #2+)     J1-21 (Cat Data Link #2+)    Expected Result:Each check of the resistance is less than 5 Ohms.Results:
OK - Each check of the resistance is less than 5 Ohms. Proceed to Test Step 16.
Not OK - At least one check of the resistance is greater than 5 Ohms. There is an open circuit in the wiring for the Cat Data Link #2.Repair: Repair the connection and/or the wire, when possible. Replace parts, if necessary. Verify that the problem is resolved.STOPTest Step 16. Check the Wiring for a Short Circuit
Measure the resistance between the points that are listed in Table 6. During each measurement, wiggle the wires in the harness in order to check for an intermittent problem. Be sure to wiggle the wires near each of the connectors.
Table 6
Resistance Measurements for the Cat Data Link #2
Master ECM P1 Connector    
Connector and Terminal    Connector and Terminal    
P1-20 (Cat Data Link #2-)     All of the other terminals on the P1 connector    
P1-21 (Cat Data Link #2+)     All of the other terminals on the P1 connector    Expected Result:Each check of the resistance is greater than 5 Ohms.Results:
OK - Each check of the resistance is greater than 5 Ohms.Repair: Perform the following procedure:
Reconnect all of the electrical connectors.
Restore the electrical power to the engine.
Check for a 770-09 diagnostic code.If there is no diagnostic code, the original problem seems to be resolved. The original diagnostic code was probably