COUPLER AS.- 2433133 - Caterpillar

in the power train system has been discharged.After verifying that the voltage in the cabinet has been fully discharged, access the current sensors and connect the correct connector to the GENB CT current sensor. Leave the connector for the GENC CT current sensor disconnected.Proceed to the Test Step 3.Test Step 3. CHECK THE POWER CIRCUITSThe key start switch and the battery disconnect switch remain in the OFF position.The harness connector for the GENC CT current sensor remains disconnected.
Energize the 24 volt control system by moving the battery disconnect to the ON position and the engine lockout control switch to the ON position.
At the harness connector for the GENC CT current sensor, measure the voltage between the (+) 15 volt circuit contact 1 (wire PWR4P-RD(Red)) and a good cabinet ground contact point.
At the harness connector for the GENC CT current sensor, measure the voltage between the (-) 15 volt circuit contact 2 (wire PWR4N-BU(Blue)) and a good cabinet ground contact point. Expected Result:The voltage measurements should indicate approximately (+) 15 volts and approximately (-)15 volts.Results:
OK - The voltage measurements are indicating that the ECM power supplies for the sensor are correct. Proceed to the Test Step 4.
NOT OK - At least one of the voltage measurements between the power supply circuits and cabinet ground is not correct. Both of the power supplies for the current sensor are not present at the sensor connector.Repair: Refer to the connection diagram at the beginning of this procedure. Check the power supplies at the ECM connector contacts. If the correct voltage is not measured at the ECM power supply contacts, proceed to the "CHECK THE STATUS OF THE DIAGNOSTIC CODE" Test Step.If the correct voltage is measured at the ECM power supply contacts, there is an open or a poor connection in the power supply circuit between the ECM and the current sensor.Check the power supply connections at Terminal Block 2.Replace the power supply cable if required in order to resolve the problem.STOPTest Step 4. CHECK THE CURRENT SENSOR CIRCUITS FOR A SHORT TO GROUNDThe engine lockout control switch remains in the ON position.The harness connector for the GENC CT current sensor remains disconnected.
Turn the engine lockout control switch to the OFF position.
Verify that the key start switch is in the OFF position. Turn the battery disconnect switch to the OFF position.
Remove the cabinet compartment cover (2) from the compartment that contains the Motor 2 ECM.
Disconnect the harness connector J2 from the Motor 2 ECM.
At the harness connector J2, measure the resistance between the sensor signal (+) contact J2-42 (wire SIGA3P-BK(Black)) and a good cabinet ground contact point. Measure the resistance between the sensor signal (+) contact J2-42 and all of the other circuit contacts