ENGINE AR-CORE 3935707 - Caterpillar

Illustration 1 g02339637
Connections for the Boom Angle sensor This diagnostic code is associated with the Boom Angle sensor. An FMI 03 diagnostic code indicates the Machine ECM has determined the sensor circuit voltage is above normal.For machines equipped with the E-Fence feature, reference Troubleshooting, " E-Ceiling and Cab Avoidance - Troubleshoot"Possible causes for this diagnostic code are listed below:
Sensor power supply failure.
The sensor has failed.
Open sensor output circuit.
Sensor output shorted to power supply.
The Machine ECM has failed (unlikely).Note: Poor connections are often the cause of a problem in electrical circuits. Before performing this procedure, inspect all the machine harnesses and connectors involved in the circuit. Make sure to verify that all of the connections in the circuit are clean, secure, and in good condition. Correct any problems found with any of the connections. Verify the diagnostic code CID 2425 FMI 03 is still active, before continuing with this procedure.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes now, but clear those diagnostic codes when the original diagnostic code has been corrected. Test Step 1. CHECK THE SENSOR POWER SUPPLY.
The key start switch and the disconnect switch remain in the ON position.
At the machine harness connector for the Boom Angle sensor, measure the voltage between the contact for A (wire R997-OR) and the contact for B (wire A209-BK) in the sensor harness connector.Expected Result:The voltage is 5 VDC.Results:
YES - The voltage is 5 VDC. Go to Test Step 2.
NO - The voltage is not 5 VDC. Repair: There is a problem with the 5 VDC power supply from the Machine ECM. Use the procedures found in the MID 039 CID 0262 FMI 06 diagnostic code document in this publication to troubleshoot this power supply problem. After the 5 VDC power supply problem is corrected, check if the CID 2425 FMI 03 diagnostic code is active. If the diagnostic code is active, go to Test Step 2.Test Step 2. CHECK THE SENSOR.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the machine harness connector from the Boom Angle sensor.
At the sensor harness connector, insert a jumper wire between the contact for C (wire E441-GN) and the contact for B (wire A209-BK) in the sensor harness connector.
Turn the disconnect switch and the key start switch to the ON position.
Observe the status of the CID 2425 FMI 03 diagnostic code. Expected Result:The CID 2425 FMI 03 diagnostic code stays active. Results:
YES - The CID 2425 FMI 03 diagnostic code stays active. The sensor is not the cause of the problem. Go to Test Step 3.
NO - The CID 2425 FMI 03 diagnostic code is no longer active and has been replaced by a CID 2425 FMI 04 diagnostic code.Repair: The sensor has failed. Replace the sensor. The new sensor will need to be calibrated. Go to Test Step 5.Test Step 3. CHECK THE SENSOR CIRCUIT FOR AN OPEN.
Turn the key start switch and the disconnect switch to the OFF position.
The sensor harness connector