RETAINER-BRG-YM 3309281 - Caterpillar

Operation Description:To use the following procedure, it is necessary to know the connector contact of the main display module and the contact that corresponds to the service code. See the Electrical System Schematic in the Service Manual for the machine in order to determine the proper connector contact of the main display module. Use the 7X-1710 Cable Probe on the connector contact of the sensor signal wire on the ECM.Note: The sensors are provided power from the ECM. Therefore, the ECM must be connected in order for the sensors to function.Two items are checked in this test:
A sensor signal is present at the ECM.
For an increase and/or a decrease in the system that is being monitored, the signal voltage will increase and/or the signal voltage will decrease.Test Step 1. CHECK THE INITIAL SIGNAL VOLTAGE.
The engine coolant and the temperature sensors should be below operating temperature.
Ensure that the engine coolant and temperature sensors are below normal. Ensure that the key switch is OFF and that the sensor is connected to the machine harness.
Turn the key switch to the ON position. DO NOT START THE ENGINE.
At the machine harness connector for the main display module, measure the voltage and record the voltage (DCV) between the signal contact and frame ground. For correct operation, the approximate voltage is between 1.0 and 7.0 DCV. Expected Result:The voltage that is measured is within the specifications.Results:
YES - The approximate voltage is between 1.0 and 7.0 DCV. The signal voltage to the ECM is correct. Proceed to test step 2.
NO - The approximate voltage is NOT between 1.0 and 7.0 DCV. The signal voltage to the ECM is not correct. The probable cause is a failed sensor.Repair: The sensor has failed. Replace the sensor.STOPTest Step 2. CHECK THE SIGNAL VOLTAGE WITH THE NEW CONDITIONS.
Increase the temperature, the pressure or the fuel level of the system that is being tested. The following procedures are examples:
Operate the engine in order to increase the temperature of the engine coolant.
Operate the implement controls in order to increase the hydraulic oil temperature.
Add fuel in order to increase the fuel level.
At the machine harness connector for the main display module, measure the voltage (DCV) between the signal contact and frame ground.
For the correct operation, the voltage (DCV) is greater than the voltage that was recorded in the previous test step. Note: Check the signal voltage with the new operating conditions. Compare these voltages with the voltages from the previous test step.Expected Result:The voltage increases during the test procedure.Results:
OK - The voltage increase during the test procedure and the sensor operates smoothly. The sensor has not failed.STOP
NOT OK - The voltage does not increase during the test procedure. The probable cause is a failed sensor.Repair: The sensor has failed. Replace the sensor.STOP