SWITCH AS-ROCKER 2144700 - Caterpillar

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.
Table 5
Specifications for Sensor Voltage Test    
Fuel Level Sensor (Resistive Type)    
Machine    Fuel
Level    Sensor
Resistance    Buffer
Duty Cycle    
994     Empty     0-5 Ω     94-90%    
994     Full     90-100 Ω     28-21%    
992G     Empty     90-100 Ω     28-21%    
992G     Full     0-5 Ω     94-90%    Procedure
Locate the suspect sensor. Identify the sensor wires and connector contacts. See Testing and Adjusting, "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. Note: Some sensors are powered by the VIMS interface modules and use 8 volts and other sensors are powered from the battery and use 24 volts. Refer to the Electrical System Schematic in order to determine the voltage that is required for the sensor that is being checked.
CHECK THE SENSOR POWER.
At the sensor connector, identify the +V and ground circuits.
Insert the 7X-1710 Multimeter Probe leads into the back of the sensor connector along side of the +V and ground circuit wires.
Measure the system voltage.Expected Result: The voltage is between 7.5 DCV and 8.5 DCV or the voltage is between 24 DCV and 29.5 DCV.Results:
OK - Voltage is between 7.5 DCV and 8.5 DCV or the voltage is between 24 DCV and 29.5 DCV. The system voltage is present. Proceed to Step 2.
NOT OK - Voltage is not between 7.5 DCV and 8.5 DCV or the voltage is not between 24 DCV and 29.5 DCV. There is an open circuit. Trace the +V and ground circuits in the machine harness. Repair the machine harness or replace the machine harness. STOP.
CHECK THE SIGNAL VOLTAGE.
At the sensor connector, identify the signal and ground circuits.
Insert the 7X-1710 Multimeter Probe leads into the back of the sensor connector along side of the signal and ground circuit wires.
Measure the signal voltage and record the signal 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 Result: The signal voltage is between approximately 1.0 DCV and 8.0 DCV. Results:
VOLTAGE is FROM 1.0 DCV TO 8.0 DCV. The signal voltage at the sensor is correct. Proceed to Step 3.
VOLTAGE is GREATER THAN 9.0 VDC. The voltage is NOT between approximately 1.0 DCV and 8.0 DCV. The signal voltage is not correct. Proceed to Step 4.
VOLTAGE is LESS THAN 1.0 DCV. The voltage is less than 1.0 DCV. Proceed to Step 5.
CHECK THE SIGNAL CIRCUIT OF THE MACHINE HARNESS.
At the machine harness connector for the main display module, identify the signal and ground circuits. DO NOT DISCONNECT THE HARNESS CONNECTOR.
Insert the 7X-1710 Multimeter Probe leads into the back of the machine harness connector along side of the signal and ground circuit wires.
Measure the