259D Compact Track Loader – MID 039 – CID 2471 – FMI 03

Conditions Which Generate This Code:



Illustration 1g03372265

Schematic of the Door Switch (Implement Lockout)

(Switch is shown in the Door Open position)

This diagnostic code is associated with the Door Switch (Implement Lockout). The switch is connected to two inputs of the ECM. One contact is normally open. The other contact is normally closed. Wire G943-BU is open and wire G944-YL is closed, when the Door Switch (Implement Lockout) is in the Door Open position. Wire G943-BU is closed and wire G944-YL is open, when the Door Switch (Implement Lockout) is in the Door Closed position. Refer to table 1.

Table 1
Status of the Door Switch (Implement Lockout)    
Door     Switch Position     G943-BU Circuit
J2-37
Contact B    
G944-YL Circuit
J2-29
Contact C    
Open     Up     Open     Closed    
Closed     Down     Closed     Open    

This FMI 03 means that the ECM has determined that both contacts are open.

Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 2471 FMI 03 is active before performing this procedure.

Test Step 1. CHECK THE GROUND CIRCUIT OF THE SWITCH IN THE HARNESS

  1. Disconnect the negative battery cable and turn the key start switch to the OFF position.

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

  1. Measure the resistance from Frame Ground of the machine to contact A (wire 200-BK) .

Expected Result:

The resistance is less than 5 ohms.

Results:

  • OK - The resistance is less than 5 ohms. The circuit is correct. Proceed to Test Step 2.

  • NOT OK - The resistance is greater than 5000 ohms. The circuit is open. The machine harness has failed.

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

    STOP

Test Step 2. CHECK THE SWITCH CIRCUITS FOR A SHORT TO THE +BATTERY CIRCUIT

  1. The machine harness connector(s) remains disconnected from the ECM.

  1. The key start switch remains in the OFF position.

  1. Disconnect the Door switch at the connector to the machine harness.

  1. At the machine harness connector for the ECM, measure the resistance from contact J2-37 (wire G943-BU) and contact J2-29 (wire G944-YL) of the machine harness to all the contacts that are used in the machine harness connectors for the ECM.

Expected Result:

Each resistance measurement is greater than 5000 ohms.

Results:

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

  • NO - One or more of the measurements were less than 5 ohms. There is a short in the machine harness.

    Repair: The short is between wire G943-BU and the circuit with the lowest resistance measurement or the short is between wire G944-YL and the circuit with the lowest resistance measurement. Repair the machine harness or replace the machine harness.

    STOP

Test Step 3. CHECK THE SWITCH CIRCUITS IN THE HARNESS

  1. The machine harness remains disconnected from the ECM and the switch.

  1. At the harness connector for the switch, connect a jumper wire between contact B (wire G943-BU) and contact C (wire G944-YL).

  1. At the harness connector for the ECM, measure the resistance from contact J2-37 (wire G943-BU) to contact J2-29 (wire G944-YL).

Expected Result:

The resistance is less than 5 ohms.

Results:

  • OK - The resistance is less than 5 ohms. Proceed to Test Step 4.

  • NOT OK - The resistance is greater than 5000 ohms. The circuit is open.

    Repair: The machine harness has failed. Repair the machine harness or replace the machine harness.

    STOP

Test Step 4. CHECK THE OPERATION OF THE SWITCH

  1. Remove the jumper that was installed in the previous Test Step.

  1. The machine harness remains disconnected from the switch.

  1. Connect one lead from a multimeter to contact A (wire 200-BK) of the connector for the switch.

  1. Connect the other lead from the multimeter to contact B (wire G943-BU) of the connector for the switch.

  1. Put the switch in the Up (Door Open) position.

  1. Measure the resistance between contact A (wire 200-BK) and contact B (wire G943-BU). Note the resistance.

  1. Change the switch to the Down (Door Closed) position.

  1. Measure the resistance between contact A (wire 200-BK) and contact B (wire G943-BU). Note the resistance.

  1. Disconnect the lead from contact B (wire G943-BU) and connect the lead to contact C (wire G944-YL).

  1. Change the switch to the Up (Door Open) position.

  1. Measure the resistance between contact A (wire 200-BK) and contact C (wire G944-YL). Note the resistance.

  1. Change the switch to the Down (Door Closed) position.

  1. Measure the resistance between contact A (wire 200-BK) and contact C (wire G944-YL). Note the resistance.

Expected Result:

The resistances agree with Table 1.

The resistance from contact A to contact B is greater than 5000 ohms when the switch is Up (Door Open), and the resistance from contact A to contact B is less than 5 ohms when the switch is Down (Door Closed).

The resistance from contact A to contact C is less than 5 ohms when the switch is Up (Door Open), and the resistance from contact A to contact C is greater than 5000 ohms when the switch is Down (Door Closed).

Results:

  • YES - The resistance from contact A to contact B is greater than 5000 ohms when the switch is Up (Door Open), and the resistance from contact A to contact B is less than 5 ohms when the switch is Down (Door Closed). The resistance from contact A to contact C is less than 5 ohms when the switch is Up (Door Open), and the resistance from contact A to contact C is greater than 5000 ohms when the switch is Down (Door Closed). Proceed to Test Step 5.

  • NO - The resistance from contact A to contact B is NOT greater than 5000 ohms when the switch is Up (Door Open), OR the resistance from contact A to contact B is NOT less than 5 ohms when the switch is Down (Door Closed). The resistance from contact A to contact C is NOT less than 5 ohms when the switch is Up (Door Open), OR the resistance from contact A to contact C is NOT greater than 5000 ohms when the switch is Down (Door Closed). The switch has failed.

    Repair: Replace the switch.

    STOP

Test Step 5. CHECK IF THE DIAGNOSTIC CODE REMAINS

  1. Inspect the contacts of the harness connectors and clean the harness connectors.

  1. Reconnect all the harness connectors.

  1. Reconnect the negative battery cable and turn the key start switch to the ON position.

  1. Operate the machine.

  1. Check the status of the CID 2471 FMI 03.

Expected Result:

The CID 2471 FMI 03 is active.

Results:

  • YES - The CID 2471 FMI 03 is active. The diagnostic code has not been corrected. The ECM may have failed.

    Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, contact your dealership's Technical Communicator 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".

    STOP

  • NO - The CID 2471 FMI 03 is not active. The diagnostic code does not exist 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

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