345D, 349D and 349D2 Excavators and 345D MHPU, 349D MHPU and 349D2 MHPU Mobile Hydraulic Power Units Machine Electronic Control System MID 039 - CID 0096 - FMI 04 Caterpillar


MID 039 - CID 0096 - FMI 04
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Conditions Which Generate This Code:



Illustration 1g01520288
Schematic for the fuel level sender

The CID 0096 FMI 04 diagnostic code is recorded when the Monitor reads a low signal (voltage) of the "fuel level sender". The Monitor indicates the low voltage condition to the Machine ECM over the CAN Data Link.

The possible causes of this failure are listed here:

  • The sender has failed.

  • The signal circuit in the machine harness is shorted to ground.

  • The Monitor has failed. This is unlikely.

Note: The Machine ECM is equipped with LED indicators that serve as a self-diagnostic check. With the key start switch ON, the following can be determined by the ECM indicator lights: · If all of the LED lights are Off, voltage is not being supplied to the Machine ECM. Check for power to the ECM. · If the yellow LED is Flashing, a communication error exists on the "CAN" data-link circuit. · If the yellow LED is constantly On, the Machine ECM software may be missing / not loaded. · If the red LED is Flashing, the Machine ECM has failed and may need replacement.

This failure causes the fuel gauge to always indicate an empty fuel tank or the fuel gauge may intermittently indicate an empty fuel tank.

Test Step 1. CHECK THE SENDER.

The key start switch and the disconnect switch should be in the ON position.

  1. Disconnect the machine harness from the sender.

Expected Result:

The CID 0096 FMI 04 diagnostic code is no longer active.

Results:

  • OK - The CID 0096 FMI 04 diagnostic code is no longer active. This indicates that the failure is no longer present. The sender has failed.

    Repair: Replace the sender.

    STOP

  • NOT OK - The diagnostic code remains active. The failure remains present. The sender is not the cause of the failure. Proceed to Test Step 2.

Test Step 2. CHECK THE HARNESS.

  1. The sender remains disconnected from the machine harness.

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

  3. Disconnect the machine harness connector (12 contact) that contains wire 495-GN(Green) from the Monitor ECM.

  4. At the machine harness connector for the sender, measure the resistance between the signal contact 1 (wire 495-GN(Green)) and frame ground.

Expected Result:

The resistance is greater than 5000 ohms.

Results:

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

  • NOT OK - The resistance is less than 5000 ohms. The machine harness has failed. There is a short between frame ground and the signal circuit in the machine harness.

    Repair: Repair the machine harness or replace the machine harness.

    STOP

Test Step 3. CONFIRM THAT THE DIAGNOSTIC CODE IS ACTIVE

  1. Clean the contacts of the harness connectors.

  2. Reconnect all harness connectors.

  3. Turn the key start switch to the ON position.

  4. Operate the machine.

  5. Check for an active CID 0096 FMI 04 diagnostic code for the "fuel level sender".

Expected Result:

The CID 0096 FMI 04 diagnostic code for the fuel level sender is NOT active.

Results:

  • OK - The CID 0096 FMI 04 diagnostic code for the fuel level sender is NOT active at this time.

    Repair: The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.

    STOP

  • NOT OK - The CID 0096 FMI 04 diagnostic code for the fuel level sender is still active at this time.

    Repair: It is not likely that the Monitor has failed. Exit this procedure and perform this procedure again. Refer to the Electrical System Schematic for this machine and check all involved wiring harness connectors and all involved wiring. Ensure that the connector contacts are clean and that all connector contacts are good condition. Ensure that all wiring of the machine harness is intact and that all wiring of the machine harness is in good condition. If the cause of the diagnostic code is not found, replace the Monitor.

    STOP

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