PUMP GP- 20R2663 - Caterpillar

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
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%
(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.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.Locate the suspect sensor. Identify the sensor wires and connector contacts. See Diagnostic Function, "Pulse Width Modulated (PWM) Sensor". 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 electronic control module 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. Test Step 1. 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 Test 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: 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.
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