5130, 5130B and 5230 Excavators, 784B, 785B, 785C, 789B, 789C, 793B and 793C Off-Highway Truck/Tractors and 992G, 994 and 994D Wheel Loaders Vital Information Management System (VIMS) Caterpillar

Sensor Dynamic Test

Usage:

793B 1HL

Note: The VIMS module is disconnected.

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Table 1
Specifications for the Sensor Signal Voltage Test.⁽¹⁾
Temperature Sensor
Temperature	Signal Voltage⁽²⁾	Duty Cycle⁽²⁾⁽³⁾
−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 1.9 DCV	15 to 23%
20 to 40°C (68 to 104°F)	1.9 to 2.9 DCV	23 to 37%
40 to 60°C (104 to 140°F)	2.9 to 4.0 DCV	37 to 55%
60 to 80°C (140 to 176°F)	4.0 to 5.1 DCV	55 to 71%
80 to 100°C (176 to 212°F)	5.1 to 5.8 DCV	71 to 82%
100 to 120°C (212 to 248°F)	5.8 to 6.3 DCV	82 to 89%
120 to 140°C (248 to 275°F)	6.3 to 6.5 DCV	89 to 93%

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⁽¹⁾	These specifications may be used with Step 2 of the following procedure.
⁽²⁾	The voltages that are listed here are guidelines for troubleshooting. The values are not considered to be exact. The tolerance is ±10%. The tolerance depends on the condition of the harness. The voltage output should change smoothly with the change in temperature.
⁽³⁾	Frequency of the 100-3055 Sensor is 5 kHz.

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Table 2
Specifications for Sensor Voltage Test ⁽¹⁾
Exhaust Temperature Sensor
Temperature	Signal Voltage⁽²⁾	Duty Cycle ⁽²⁾⁽³⁾
50 to 200 °C (122 to 392°F)	1.4 to 2.0 DCV	22 to 33%
200 to 400 °C (392 to 725°F)	2.0 to 2.8 DCV	35 to 50%
400 to 600 °C (725 to 1112°F)	2.8 to 3.7 DCV	50 to 67%
600 to 850 °C (1112 to 1562°F)	3.7 to 4.8 DCV	67 to 88%

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⁽¹⁾	These specifications may be used with Step 2 of the following procedure.
⁽²⁾	The voltages that are listed here are guidelines for troubleshooting. The values are not considered to be exact. The tolerance is ±10%. The tolerance depends on the condition of the harness. The voltage output should change smoothly with the change in temperature.
⁽³⁾	Frequency of the 3E-7826 Sensor is 500 Hz.

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Table 3
Specifications for Sensor Voltage Test ⁽¹⁾
Pressure Sensor (Air)
Air Pressure	Signal Voltage⁽²⁾	Duty Cycle⁽²⁾⁽³⁾
0 to 200 kPa (0 to 29 psi)	0.9 to 1.8 DCV	10 to 27%
200 to 400 kPa (29 to 58 psi)	1.8 to 2.8 DCV	27 to 45%
400 to 600 kPa (58 to 88 psi)	2.8 to 3.7 DCV	45 to 62%
600 to 800 kPa (88 to 115 psi)	3.7 to 4.6 DCV	62 to 80%
800 to 1000 kPa (115 to 145 psi)	4.6 to 5.5 DCV	80 to 100%

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⁽¹⁾	These specifications may be used with Step 2 of the following procedure.
⁽²⁾	The voltages that are listed here are guidelines for troubleshooting. The values are not considered to be exact. The tolerance is ±10%. The tolerance depends on the condition of the harness. The voltage output should change smoothly with the change in air pressure.
⁽³⁾	Frequency of the 100-4311 Sensor is 5 kHz.

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Table 4
Specifications for the Sensor Voltage Test ⁽¹⁾
Ultrasonic Fuel Level Sensor
Depth of Fuel (Deep Tank)⁽²⁾	Depth of Fuel ⁽²⁾(Shallow Tank)	Signal ⁽³⁾ Voltage	Duty Cycle⁽³⁾⁽⁴⁾
0 to 500 mm (0 to 19.7 inch)	0 to 250 mm (0 to 9.9 inch)	0.6 to 1.9 DCV	6 to 25%
500 to 1000 mm (19.7 to 39.4 inch)	250 to 500 mm (9.9 to 19.7 inch)	1.9 to 3.2 DCV	25 to 45%
1000 to 1500 mm (39.4 to 59.1 inch)	500 to 750 mm (19.7 to 29.6 inch)	3.2 to 4.5 DCV	45 to 64%
1500 to 2000 mm (59.1 to 78.8 inch)	750 to 1000 mm (29.6 to 39.4 inch)	4.5 to 5.7 DCV	64 to 84%

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⁽¹⁾	These specifications may be used with Step 2 of the following procedure.
⁽²⁾	Connector contact 3 is used to program the sensor for the proper depth of the tank . Contact 3 is grounded for shallow tanks and open for deep tanks. See the Electrical System Schematic for the machine that is being serviced.
⁽³⁾	The voltages that are listed here are guidelines for troubleshooting. The values are not considered to be exact. The tolerance is ±10%. The tolerance depends on the condition of the harness. The voltage output should change smoothly as the signal changes.
⁽⁴⁾	Frequency of the sensor is 4 kHz.

Note: The actual fuel level may not agree with the sensor. The fuel level reading depends on the location of the sensor in the fuel tank.

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Table 5
Specifications for the Lift Position Sensor that is used with the Large Wheel Loaders
Mechanical Range (MAX)	Duty Cycle⁽¹⁾
102 Degrees	3 to 97 %

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⁽¹⁾	Frequency of the sensor is 600 Hz.

This quick check is used to determine if the sensor is functioning. The accuracy of the sensor is not checked. Perform this test only after successfully completing the Sensor Voltage Test.

Use the Electrical System Schematic in the machine Service Manual in order to determine the VIMS connector contact that corresponds to the failed machine condition. Use the correct service tool to remove the signal wire connector contact from the machine harness connector of the VIMS module.

Note: The sensors are powered by the VIMS module with the exception of the fuel level sensor. System voltage is the power source of the fuel level sensor. The VIMS module must be connected in order to provide power for the sensors.

Two items are checked in this test:

A sensor signal is present at the VIMS module.
The signal voltage increases with a corresponding increase in the monitored system. The signal voltage decreases with a corresponding decrease in the monitored system.

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.
For fuel level sensors (buffer and sender), the fuel level is low.

CHECK THE SIGNAL VOLTAGE.
1. Turn the key start switch to theOFFposition.
2. Ensure that the sensor is connected to the machine harness.
3. Remove the contact of the signal wire from the connector of the VIMS interface module.
4. Turn the key start switch to the ON position. DO NOT START THE ENGINE.
5. At the machine harness connector for the VIMS module, 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 VIMS interface module is correct. Proceed to 3.
  - NOT OK - Voltage is NOT between approximately 0.9 DCV and 9.6 DCV. The signal voltage to the VIMS interface module is not correct. The probable cause is a failed sensor. Replace the sensor. STOP.
CHANGE THE RELATED CONDITION OF THE MACHINE.
1. Increase the temperature, pressure or fuel level 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 implement controls in order to increase the temperature of the hydraulic oil. Proceed to 3.
CHECK THE SIGNAL VOLTAGE.
1. At the machine harness connector for the VIMS module, 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 correct. STOP.
  - NOT OK - Voltage is NOT greater. The probable cause is a failed sensor. Replace the sensor. STOP.