259D Compact Track Loader – MID 039 – CID 3700 – FMI 04

Conditions Which Generate This Code:

Illustration 1g03372582

Schematic of the Loader Bucket Inclinometer Sensor

This diagnostic code is associated with the Loader Bucket Inclinometer sensor. The FMI 04 means that the ECM has determined that the voltage of the circuit for the position sensor is below normal.

The possible causes of this diagnostic code are listed below:

  • The signal circuit for the sensor is shorted to ground.

  • The sensor has failed.

  • The Machine ECM has failed. This 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 of the connections in the circuit are clean and that all connections are secure. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure. Each connector contact should withstand 45 N (10 lb) of pull. Each wire should remain in the connector body. This test checks whether the wire was properly crimped in the contact and whether the contact was properly inserted into the connector.

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 3700 FMI 04 is active before performing this procedure.

Note: Use a digital multimeter for the measurements in this procedure.

System Response:

The implements will stop working until the right-hand joystick is returned to the center position. After the joystick has been centered, the implements will behave normally, but the Self Level, Return-to-Dig, and Work Tool Positioner features will be disabled. The green Self Level icon on the machine left-hand display will no longer light up when the Self Level Cab switch is turned on. In the case of an intermittent fault, these features will be disabled until the next key cycle.


  1. Turn the disconnect switch and the key start switch to the ON position.

  1. Ensure that the diagnostic code is active.

  1. Observe the status of the diagnostic code. Disconnect the sensor from the machine harness.

Expected Result:

The FMI 04 changes to an FMI 03


  • OK - The FMI 04 changes to an FMI 03. The sensor has failed.

    Repair: Repair of repace to sensor.


  • NOT OK - The FMI 04 code remains active. Proceed to test step 2.


  1. Turn the key start switch and the disconnect switch to the OFF position.

  1. Disconnect the machine harness from the sensor.

  1. Disconnect the machine harness connector(s) from the ECM.

  1. At the machine harness connector for the ECM, measure the resistance from the signal contact J2-15 (wire A426-BU) of the machine harness to all possible sources of ground. Measure the resistance to all contacts of the machine harness connectors for the Machine ECM.

Expected Result:

Each resistance measurement is greater than 5000 ohms.


  • OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.

  • NOT OK - One or more resistance measurements is not correct. There is a short in the machine harness.

    Repair: The short is between signal contact J2-15 (wire A426-BU) and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.



  1. Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation that is caused by excessive heat, battery acid, or chafing.

  1. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.

  1. Reconnect all harness connectors in order to make sure that the connectors are fully seated. Also, make sure that the clips for each connector are completely fastened.

  1. Turn the disconnect switch and the key start switch to the ON position.

  1. Operate the machine.

  1. Check the status of the diagnostic code.

Expected Result:

The diagnostic code is no longer active.


  • YES - The diagnostic code is not active. The initial diagnostic code was probably caused by a poor electrical connection at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.STOP

  • NO - The diagnostic code is active. The diagnostic code has not been corrected.

    Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".


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