SPRING 2348983 - Caterpillar

Illustration 1 g02789965
Schematic for the Boom Angle sensor
This diagnostic code is associated with the Boom Angle sensor. An FMI 04 diagnostic code indicates the Machine ECM has determined the sensor circuit voltage is below 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.
Sensor output shorted to ground.
The Machine ECM has failed. This situation is 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 04 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
Turn the key start switch and the disconnect switch to the ON position.
At the machine harness connector for the Boom Angle sensor, measure the voltage between contact A (wire A760-GY(Grey)) and contact B (wire A209-BK(Black)). 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 MID 039 CID 0262 FMI 06 diagnostic code to troubleshoot the power supply. After the supply is corrected, check if the CID 2425 FMI 04 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.
Turn the disconnect switch and the key start switch to the ON position.
Observe the status of the CID 2425 FMI 04 diagnostic code. Expected Result:The CID 2425 FMI 04 diagnostic code remains active. Results:
YES - The CID 2425 FMI 04 diagnostic code remains active. The sensor is not the cause of the problem. Go to Test Step 3.
NO - The CID 2425 FMI 04 diagnostic code has been replaced by the CID 2425 FMI 03 diagnostic code. The sensor has failed. Repair: Replace the sensor. The new sensor may require calibration. Go to Test Step 4.Test Step 3. CHECK THE SENSOR CIRCUIT FOR A SHORT.
The sensor remains disconnected from the machine harness.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect both the J1 and J2 harness connector from the Machine ECM.
At the J1 machine harness connector, measure the resistance from contact J1-5 (wire E441-GN(Green)) to all contacts used in the J1 and J2 ECM harness connectors. Expected Result:The all measurements are more than 5000 ohms.Results:
YES - The measurements are all more than 5000