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OPERATOR AR 3904359 - Caterpillar

3904359 OPERATOR AR Caterpillar parts 308E SR OPERATOR
Alternative (cross code) number:
Caterpillar 3904359 OPERATOR AR

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Compatible equipment models: 3904359:

MINI HYD EXCAVATOR  308E SR   Caterpillar
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Illustration 1 g02763616
Schematic of the connections for the Power Supply (10 VDC) of the Brake ECM
This diagnostic code is associated with the 10 VDC power supply for the Brake ECM. The 10 VDC power supply for the sensors provides the power for the speed sensors. The speed sensors are located at the rear of the 793F truck on the right and left sides of the axle.The CID 1482 FMI 04 diagnostic code becomes active when the Brake ECM detects that the voltage for the power supply is below normal.The possible causes of this diagnostic code are listed below:
A component that is powered by the power supply has failed.
The power supply circuit is shorted to a ground source.
The Brake ECM has failed. This situation is unlikely. Note: Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections are secure and that all connections are in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.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 1482 FMI 04 is active before performing this procedure. Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.Test Step 1. CHECK THE COMPONENTS
Turn the disconnect switch and the key start switch to the ON position.
One at a time, disconnect a component that uses the power supply from the machine harness. As each sensor is disconnected, check the status of the CID 1482 FMI 04 diagnostic code.
Continue disconnecting the sensors from the machine harness one at a time until the status of the CID 1482 FMI 04 diagnostic code changes. Expected Result:When one of the components is disconnected from the machine harness, the CID 1482 FMI 04 diagnostic code is no longer active.Results:
OK - The CID 1482 FMI 04 diagnostic code is not active when one of the sensors is disconnected. The power supply circuit is correct. The component that was disconnected when the status of the CID 1482 FMI 04 diagnostic code changed is the sensor that failed. Repeat this test procedure in order to verify the sensor that is the cause of the problem.Repair: Once the component that is the cause of the problem is determined, replace the component. After the component has been replaced, verify that the problem has been corrected before operating the machine.STOP
NOT OK - The CID 1482 FMI 04 diagnostic code is still active. Disconnecting all of the sensors that use the power supply does not change the status of the diagnostic code. Proceed to Test Step 2.Test Step 2. CHECK THE POWER SUPPLY AT THE ECMAll components that are connected to the power supply remain disconnected from the machine harness.
Turn the key start switch

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308E SR Mini Hydraulic Excavator JSN00001-UP (MACHINE) POWERED BY C3.3B Engine

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