GEAR GP 1254183 - Caterpillar

Illustration 1 g02041353
Schematic of the front track position sensorThis diagnostic code is recorded when the ECM reads the sensor signal as above normal or the sensor signal is shorted to the +battery.The possible causes of this failure are listed below:
The battery circuit (wire 119-PK) from the electrical system to the sensor is open.
The return circuit (wire 229-BK) is open.
The signal circuit is open.
The signal circuit is shorted to the +battery.
The sensor is faulty.
The ECM has failed. This is unlikely.System Response:The machine response is listed below:
A Category 2 warning is showing on the Computerized Monitoring System (CMS).
A fault on the front track position sensor will only allow steering in the FRONT position. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 743 FMI 03 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.Test Step 1. CHECK THE RETURN CIRCUIT
Turn the key start switch to the OFF position.
Disconnect the machine harness from the sensor.
At the sensor connector of the machine harness, measure the resistance between return contact B and frame ground.Expected Result:The resistance should measure 5 ohms or less.Results:
OK