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

Sensor Dynamic Operation

Usage:

System Operation Description:

Note: The electronic control module is connected.

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Table 1
Sensor Voltage Specifications ⁽¹⁾ Sensor Dynamic Test
100-3055 Temperature Sensor And 131-0427 Temperature Sensor
Temperature	Signal Voltage⁽²⁾	Duty Cycle
−40 to 20°C (−40 to −4°F)	1.0 to 1.1 DCV	10 to 11%
−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⁾	If you desire, use these specifications with the following procedure.
⁽²⁾	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 ⁽¹⁾ 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%

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⁽¹⁾	If you desire, use these specifications with the following procedure.
⁽²⁾	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.

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. The approximate voltage is between 1.0 and 9.0 DCV for the 3E-5370 131-0784 Temperature Sensor Groups.
Note: When precise specifications for the signal voltage are necessary, use the specifications that are listed in the provided tables.

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 approximate voltage is between 1.0 and 9.0 DCV for the 3E-5370 131-0784 Temperature Sensor Groups. The signal voltage to the main display module is correct. Proceed to test step 2.
NO - The approximate voltage is NOT between 1.0 and 7.0 DCV. The approximate voltage is NOT between 1.0 and 9.0 DCV for the 3E-5370 131-0784 Temperature Sensor Groups. The signal voltage to the main display module is not correct. The probable cause is a failed sensor.
Repair: The sensor has failed. Replace the sensor.

STOP

Test 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: Run the engine in order to increase the temperature of the engine coolant. , Operate the implement controls in order to increase the temperature of hydraulic oil. and Add fuel to the fuel tank in order to increase the level of the fuel. .
At the machine harness connector for the main display module, measure the voltage (DCV) between the signal contact and frame ground.
The voltage (DCV) is greater than the voltage that was recorded in the previous test "Check the initial signal voltage". The voltage increases smoothly.
Note: The difference in voltage that is seen between this test and the previous test is dependent on the amount of change that was introduced in the system.

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