ELEMENT-REPLT 2840436 - Caterpillar

Table 2
Sensor Voltage Specifications (1)
For Sensor Dynamic Test
3E-5370 Temperature Sensor Group And 131-0784 Temperature Sensor
Temperature Signal Voltage(2) Duty Cycle
−40 to 20°C (−40 to −4°F) 0.8 to 1.5 DCV 4 to 11%
−20 to 0°C (−4 to 32°F) 1.5 to 2.5 DCV 11 to 22%
0 to 20°C (32 to 68°F) 2.5 to 3.7 DCV 22 to 34%
20 to 40°C (68 to 104°F) 3.7 to 4.8 DCV 34 to 46%
40 to 60°C (104 to 140°F) 4.8 to 6.0 DCV 46 to 59%
60 to 80°C (140 to 176°F) 6.0 to 7.2 DCV 59 to 71%
80 to 100°C (176 to 212°F) 7.2 to 8.1 DCV 71 to 81%
100 to 120°C (212 to 248°F) 8.1 to 8.8 DCV 81 to 87%
120 to 140°C (248 to 275°F) 8.8 to 9.2 DCV 87 to 92%
(1) If desired, use these specifications with the following procedure.
(2) These voltages are guidelines for troubleshooting and are not considered exact. The tolerance is 10%, depending on the condition of the harness. Most important is that the output voltage changes smoothly as the temperature changes.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 main display module.Note: The sensors are provided power from the main display module . Therefore, the main display module must be connected in order for the sensors to function.Two items are checked in this test:
A sensor signal is present at the main display module.
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.