SCREW-LENS 1003251 - Caterpillar

Illustration 1 g01640014
Schematic of the "Steering Motor Speed Sensor 2"
This diagnostic code is associated with the "Speed Sensor 2" for the steering motor. The FMI 01 diagnostic code means that the ECM has determined that the signal is below the normal operational range. The speed sensor is a PWM sensor that operates at a frequency of approximately 0 to 15000 hertz. The sensor has an operating duty cycle of 50% 5%. The possible causes of this diagnostic code are listed below:
The sensor has failed.
Intermittent connections or poor connections
Mechanical devices are loose.
The ECM has failed. This is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 1470 FMI 01 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure. System Response:The diagnostic code of CID 1470 FMI 01 will be logged in the internal memory of the ECM.Test Step 1. INSPECT THE SENSOR.
Perform a visual inspection of the sensor, the wiring for the sensor and the hardware that is associated with the sensor. Expected Result:There is no apparent damage to the sensor, the wiring for the sensor or the hardware that is associated with the sensor.Results:
OK - There is no apparent damage to the sensor, the wiring for the sensor or the hardware that is associated with the sensor. Proceed to Test Step 2.
NOT OK - There is apparent damage to the sensor, the wiring for the sensor or the hardware that is associated with the sensor. Repair: Replace the sensor.STOPTest Step 2. CHECK FOR POWER AT THE SENSOR.
Do not disconnect the harness connector from the sensor.
At the back of the harness connector for the sensor, insert a 7X-1710 Multimeter Probe along the voltage supply wire (contact 1).
Turn the key start switch and the disconnect switch to the ON position.
Measure the voltage from contact 1 to frame ground. Expected Result:The voltage is 8.0 DCV.Results:
OK - The voltage is 8.0 DCV. Proceed to Test Step 3.
NOT OK - The voltage is not 8.0 DCV. The circuit is open. Verify that the fuse for the circuit is OK.Repair: Repair the machine harness or replace