BLADE A. 1J3640 - Caterpillar

Illustration 1 g00608199
Schematic of the Position Sensor (Left Steer)
This diagnostic code is for the Position Sensor (Left Steer).This diagnostic code is recorded when the signal for the position of the left steering lever is out of range. The possible causes for this diagnostic code are listed below:
The +Battery circuit (140-BU(Blue)) from the electrical system to the sensor is open.
The return circuit (G939-PK(Pink)) is open.
The signal circuit is shorted to +battery or shorted to ground.
The signal circuit is open or the sensor is disconnected.
The sensor linkage is broken.
The sensor has failed.
The ECM has failed. This is unlikely. System Response:Note: Ensure that the diagnostic code for the sensor is on hold and that the diagnostic code indicator shows "SERV CODE". This procedure can cause new diagnostic codes to be recorded. Ignore these created problems. When the procedure is completed, clear the created diagnostic codes.Test Step 1. CHECK THE OPERATION OF THE SENSOR.
Turn the key start switch to the ON position.
Access Component Data Display Mode. View the value of CID 0676. See Testing and Adjusting, "Using Caterpillar Monitoring System to Determine Diagnostic Codes".
Disconnect the machine harness from the sensor. Observe the value and note the value that is showing for the sensor signal.
At the machine harness, place a jumper from contact "B" (the return circuit) to contact "C" (signal). Observe the value and note the value that is showing for the sensor signal. Expected Result:When the machine harness is disconnected from the sensor, the value that is shown should be "100". When the jumper is installed, the value that is shown should be "000".Results:
OK - When the machine harness is disconnected from the sensor, the value that is shown is "100". When the jumper is installed, the value that is shown is "000".Repair: The machine harness and the ECM are operating properly. The sensor has failed. Check the mechanical assembly of the sensor. Ensure that the sensor is moving properly when the steer lever is pulled and released. If there is no problem with the mechanical assembly of the sensor, replace the position sensor. DO NOT disassemble the mechanical part of steering lever. Disassembly and reassembly of the mechanical part of lever can result in a malfunctioning mechanism because the component can be misaligned.STOP
NOT OK - When the machine harness is disconnected from the sensor, the value that is shown is not "100". When the jumper is installed, the value that is shown is not "000". The machine harness or the ECM may have failed. Proceed to Test Step 2.Test Step 2. CHECK THE +BATTERY CIRCUIT AT THE SENSOR.
The key start switch remains ON. The machine harness remains disconnected from the sensor.
At the machine harness for the sensor, measure the voltage (VDC) between contact "A" (+Battery) and frame ground. Expected Result:The voltage should measure 9.0 to 32 VDC.Results:
OK - The voltage measures 9.0 to 32 VDC. The +battery circuit is correct. Proceed to Test Step 3.
NOT OK -