TA19-M2WD and TA19-M4WD (Delta) Agricultural Transmission Power Train Electronic Control System Caterpillar

Sensor Signal Voltage

Usage:

System Operation Description:

Note: The electronic control module is connected.

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Table 1
Sensor Voltage Specifications 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%

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⁽¹⁾

The voltages that are listed in this table are guidelines for troubleshooting. The values should not be considered to be exact. The tolerance for these measurements is ±10 percent. The proper operation of the sensor is more important. The output voltage of the sensor should change smoothly when the temperature changes.

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Table 2
Sensor Voltage Specifications 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%

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⁽¹⁾

Locate the suspect sensor. Identify the sensor wires and connector contacts. See Diagnostic Function, "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.

Identify the supply circuit and the ground circuit at the connector of the sensor.
Insert the 7X-1710 Cable Probes into the back of the connector of the sensor. Place the leads of the probe along side of the wires of the supply circuit and wires of the ground circuit.
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 supply circuit and the ground circuit in the machine harness.
Repair: Repair the machine harness or replace the machine harness.

STOP

Test 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 the ground circuit wires.
Measure the signal voltage and record the signal voltage.
Note: If a precise signal voltage is necessary, use the specifications that are listed in the provided tables.

Expected Result:

The measured signal voltage is approximately between 1.0 and 7.0 DCV. The signal voltage is between 1.0 and 9.0 DCV with the 3E-5370 Temperature Sensor Group.

Results:

FROM 1.0 TO 7.0 (9.0) DCV - The voltage is between 1.0 and 7.0 DCV (9.0 DCV for 3E-5370 Temperature Sensor Group). The signal voltage at the sensor is correct.
Repair: The harness and the main display module are working properly. The voltage that is measured is correct. The sensor has failed. Replace the sensor.

Proceed to test step 3.
GREATER THAN 7.0 (9.0) - The voltage is NOT between 1.0 and 7.0 DCV. (The Voltage is approximately 9.0 DCV for the 3E-5370 Temperature Sensor Group.) The signal voltage is not correct. The signal circuit of the machine harness is shorted to the +battery circuit.
Repair: Repair the machine harness or replace the machine harness. Repeat this test step in order to verify that the problem has been corrected. If the problem has not been corrected replace the main display module. See Testing and Adjusting, "Module - Replace".

STOP
LESS THAN 1.0 DCV - The voltage is less than 1.0 DCV. The signal voltage is not correct. The signal circuit of the machine harness is shorted to ground.
Repair: Repair the machine harness or replace the machine harness. Repeat this test step in order to verify that the problem has been corrected. If the problem has not been corrected replace the main display module. See Testing and Adjusting, "Module - Replace".

STOP

Test Step 3. CHECK THE SIGNAL CIRCUIT FOR THE MACHINE HARNESS .

At the machine harness connector for the main display module, identify the signal and ground circuits.
Note: DO NOT DISCONNECT THE HARNESS CONNECTOR.
Push the 7X-1710 Cable Probes in the back of the machine harness connector along side of the signal and ground circuit wires.
Measure the signal voltage.
Compare this measurement with the voltage that was measured in the previous test “Check the signal voltage”.

Expected Result:

The main display module is receiving a valid signal voltage of 1.0 to 7.0 DCV.

Results:

OK - The main display module is receiving a valid signal voltage. If the problem has been corrected exit this procedure. No further testing is required. If the problem still persists, further testing is required. Proceed to test step 4.
NOT OK - The voltage is different from the voltage that was measured in the previous test. The machine harness has an open in the signal or ground circuits.
Repair: Repair the machine harness or replace the machine harness.

STOP

Test Step 4. Perform the following diagnostic procedure: "Sensor Dynamic Operation"

Results: