OPERATOR AR 4509550 - Caterpillar

Note: The main display module is connected.
Table 1
Sensor Voltage Specifications
For The Sensor Voltage Test
100-3055 Temperature Sensor And 131-0427 Temperature Sensor
Temperature Signal Voltage(1) Duty Cycle
−20 to 0°C (−4 to 32°F) 1.1 to 1.4 DCV 11 to 15%
0 to 20°C (32 to 68°F) 1.4 to 2.0 DCV 15 to 23%
20 to 40°C (68 to 104°F) 2.0 to 3.1 DCV 23 to 37%
40 to 60°C (104 to 140°F) 3.1 to 4.5 DCV 37 to 55%
60 to 80°C (140 to 176°F) 4.5 to 5.7 DCV 55 to 71%
80 to 100°C (176 to 212°F) 5.7 to 6.6 DCV 71 to 82%
100 to 120°C (212 to 248°F) 6.6 to 7.2 DCV 82 to 89%
120 to 140°C (248 to 275°F) 7.2 to 7.4 DCV 89 to 93%
(1) 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.
Table 2
Sensor Voltage Specifications
For Sensor Voltage Test
3E-5370 Temperature Sensor Group And 131-0784 Temperature Sensor
Temperature Signal Voltage(1) 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) 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.Locate the suspect sensor. Identify the sensor wires and connector contacts. See Troubleshooting, "Pulse Width Modulated (PWM) Sensor - Test". DO NOT DISCONNECT ANY HARNESS CONNECTORS AT THIS TIME. Turn the key start switch to the ON position. DO NOT START THE ENGINE. Test Step 1. CHECK THE SENSOR POWER.
At the sensor connector, identify the +V and ground circuits.
Push the 7X-1710 Cable Probes in the back of the sensor connector along side of the +V and ground circuit wires.
Measure the system voltage. Expected Result:The voltage that is measured is between 7.5 and 8.5 DCV.Results:
YES - The voltage is between 7.5 and 8.5 DCV. The system voltage is present. Proceed to test step 2.
NO - The voltage is not between 7.5 and 8.5 DCV. There is an open circuit. Trace the +V and ground circuits in the machine harness.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE SIGNAL VOLTAGE.
At the sensor connector, identify the signal and ground circuits.
Push the 7X-1710 Cable Probes in the back of the sensor connector along side of the signal and