GUARD-RADIATOR 2750336 - Caterpillar

Procedure
The required machine conditions are listed here:
For temperature sensors, the coolant is below operating temperature.
For pressure sensors, the pressure is below operating pressure.
CHECK THE SIGNAL VOLTAGE.
Turn the key start switch to the OFF position.
Ensure that the sensor is connected to the machine harness.
Remove the contact of the signal wire from the connector of the VIDS ECM.
Turn the key start switch to the ON position. DO NOT START THE ENGINE.
At the machine harness connector for the VIDS ECM, measure voltage (DCV) between the signal contact and frame ground and record the voltage.Note: If more precise specifications of the signal voltage are necessary, use the specifications that are listed in the tables of "Specifications for Sensor Voltage Test". Expected Results:The voltage is between 0.9 and 9.6 DCV.Results:
OK - Voltage is between approximately 0.9 DCV and 9.6 DCV. The signal voltage to the VIDS ECM is correct. Proceed to 3.
NOT OK - Voltage is NOT between approximately 0.9 DCV and 9.6 DCV. The signal voltage to the VIDS ECM is not correct. The probable cause is a failed sensor. Replace the sensor. STOP.
CHANGE THE RELATED CONDITION OF THE MACHINE.
Increase the temperature or pressure of the system that is being tested. An example would be running the engine in order to increase the coolant temperature of the engine. Another example would be operating the machine controls in order to increase the temperature of the hydraulic oil. Proceed to 3.
CHECK THE SIGNAL VOLTAGE.
At the machine harness connector of the VIDS ECM, measure the voltage (DCV) between the signal contact and frame ground.Expected Results: The voltage is greater than the voltage that was recorded in the "CHECK THE SIGNAL VOLTAGE" test. The voltage increased smoothly. There were no large increases in the voltage. Note: The difference in voltage that is seen between this step and the previous step is dependent on the amount of change that was introduced into the system.Results:
OK - Voltage is greater and the sensor operates smoothly. The sensor is working. STOP.
NOT OK - Voltage is NOT greater. The probable cause is a failed sensor. Replace the sensor. STOP.