BLOCK-TRACK IDLER 1656946 - Caterpillar

MID 039 CID 0573 FMI 08Conditions Which Generate This Code:
Illustration 1 g01342861
Connections of the inching pedal position sensor
This diagnostic code is associated with the inching pedal position sensor. The FMI 08 means that the ECM has determined that the signal frequency or the signal pulse width is not within the expected range. The output frequency of the position sensor is approximately 500 hertz. The value of the sensor's duty cycle is approximately 3.5% when the pedal is released. The duty cycle of the signal increases as the pedal is moved from the released position to the pressed position. The value of the sensor's duty cycle is approximately 96.5% in the pressed position. 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 0573 FMI 08 is active before performing this procedure.Note: Use the digital multimeter for the measurements in this procedure. System Response:A warning will be displayed on the Caterpillar Electronic Technician (Cat ET). The transmission will be placed in NEUTRAL until the diagnostic code is cleared.Test Step 1. 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 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 12 DCV.Results:
OK - The voltage is 12 DCV. Proceed to Test Step 3.
NOT OK - The voltage is not 12 DCV. The circuit is open. Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE SIGNAL CIRCUIT OF THE SENSOR.
Turn the key start switch and the disconnect switch to the OFF position.
At the back of the harness connector for the sensor, remove the multimeter probe from contact 1 and insert the probe along the signal wire (contact 3).
At the back of the harness connector for the sensor, insert the multimeter probe along the ground wire (contact 2).
Turn the disconnect switch and the key start switch to the ON position.
Monitor the signal of the sensor with the digital multimeter.
Without disconnecting the sensor or the hardware that is associated with the sensor from the machine, take the sensor through the full operating range of the sensor. Note: On some machines, it may be necessary to start the engine in order to take the sensor through the full operating range of the sensor.Expected Result:The sensor's signal responds in the manner that is described at the begining of this procedure.Results:
OK - The sensor's signal responds correctly. The sensor is operating correctly. Proceed to Test Step 3.
NOT OK - The sensor's signal does not respond correctly. The sensor is NOT operating