BOX GP-CONTROL 3843607 - Caterpillar

Illustration 4 g01890833
At the crowbar tray, disconnect the low voltage harness connector (6) from the crowbar tray connector. Examine the pins and sockets on the connectors. Ensure that the contacts are clean, dry, and in good condition.
At the J2 harness connector for the Motor 1 ECM, measure the resistance between the voltage sensor signal circuit contact J2-58 (wire VDC2) and all of the other circuit contacts that are used in the connectors J2 and J1. Each individual resistance measurement should be greater than 5000 ohms. A measurement of less than 5000 ohms indicates a short circuit.
At the J2 harness connector for the Motor 2 ECM, measure the resistance between the voltage sensor signal circuit contact J2-58 (wire VDC2) and all of the other circuit contacts that are used in the connectors J2 and J1. Each individual resistance measurement should be greater than 5000 ohms. A measurement of less than 5000 ohms indicates a short circuit. Expected Result:All of the circuit continuity is correct and the resistance checks between the voltage sensor signal circuits and the other circuits are not indicating that the sensor signals are shorted to any other circuits.Results:
OK - There is not any indication of a voltage sensor signal circuit short to any other circuit. Before proceeding to the next step, ensure that all of the ECM harness connectors are reconnected and the circuit burden resistor is reconnected. Proceed to the Test Step 4.
NOT OK - One or more of the resistance measurements is less than 5000 volts. This indicates that there is a short circuit between the two circuits that had the low resistance measurement.Repair: Check the cabinet harness between the ECM and the crowbar tray connector where the involved circuits could have worn or damaged insulation.Once the problem area is found, repair the involved wires or replace the wires.STOPTest Step 4. CHECK THE OPERATION OF THE SENSOR
In order to test the operation of the Ground Fault Detection Sensor, refer to the Testing and Adjusting, "Voltage Sensor - Test" section of this manual. The test procedure will provide instruction for testing the operation of the voltage sensor. If the operation of the voltage sensor is correct, return to this procedure and continue from this point in order to check the status of the active diagnostic code. Expected Result:The operation of the voltage sensor has been tested and verified to be correct.Results:
YES - The operation of the voltage sensor is correct. The sensor does not appear to be causing the problem. Proceed to Test Step 5.
NO - The operation of the voltage sensor has not been confirmed to be correct.Repair: In order to verify that the voltage sensor is not causing the problem, refer to the Testing and Adjusting, "Voltage Sensor - Test" section of this manual.If further investigation is required after the operation of the sensor has been tested, return to this procedure and continue with the next test step.STOPTest Step 5. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Inspect the harness wiring connectors that are disconnected.