POWER TRAIN AR 2793351 - Caterpillar

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 VIDS ECM and use 5 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 4.5 DCV and 5.5 DCV or the voltage is between 24 DCV and 29.5 DCV.Results:
OK - Voltage is between 4.5 DCV and 5.5 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 4.5 DCV and 5.5 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.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 1.0 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 VIDS ECM, 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 signal voltage.
Compare this measurement with the voltage that was measured in Step 2.a. Expected Result: The signal voltage is equal to the voltage that was recorded in Step 2.a.Results:
OK - Signal voltage is equal to the voltage that was recorded in Step 2.a. The VIDS ECM is receiving a valid signal voltage. If the problem still persists, further testing is required. Proceed to Step 6.
NOT OK - Signal voltage is NOT equal to the voltage that was recorded in Step 2.a. The machine harness has an open in the signal or ground circuits. Repair the machine harness or replace the machine harness. STOP.
CHECK THE MACHINE HARNESS.
Signal voltage is greater than 7.0 DCV.