450E Backhoe Loader Machine Electronic Control System Caterpillar

Illustration 1	g01446677
Schematic of the Hoe Left (Machine) Joystick Thumbwheel Position Sensor

This diagnostic code is associated with the Hoe Left (Machine) Joystick Thumbwheel Position Sensor. The FMI 04 means that the ECM has determined that the voltage of the circuit for the switch is below normal.

The switch operates at a frequency of approximately 500 hz. The switch has an operating duty cycle of 10% to 90%.

The possible causes of this diagnostic code are listed below:

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

• The switch has failed.

• The ECM may have failed.

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 in the circuit are clean, secure, and 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.

System Response:

The diagnostic code of CID 2530 FMI 04 will be logged in the internal memory of the ECM. A level 2 warning will be generated. All implement functions will be disabled.

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 2530 FMI 04 is active before performing this procedure.

Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.

Test Step 1. INSPECT THE SWITCH.

1. Perform a visual inspection of the switch, the wiring for the switch and the hardware that is associated with the switch.

Expected Result:

There is no apparent damage to the switch, the wiring for the switch or the hardware that is associated with the switch.

Results:

• OK - There is no apparent damage to the switch, the wiring for the switch or the hardware that is associated with the switch. Proceed to Test Step 3.

• NOT OK - There is apparent damage to the switch, the wiring for the switch or the hardware that is associated with the switch.

  Repair: Replace the damaged part.

  Proceed to Test Step 2.

Test Step 2. CHECK THE ADJUSTMENT AND/OR THE CALIBRATION OF THE SWITCH.

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

2. Perform the calibration of the switch. Refer to the Testing and Adjusting, "Calibration" for additional information on these calibration procedures for the switches.

3. Check the status of the diagnostic code.

Expected Result:

The CID 2530 FMI 04 is not active.

Results:

• OK - The diagnostic is not active. The adjustment and/or the calibration has corrected the failure. Resume normal operation.STOP

• NOT OK - CID 2530 FMI 04 is still active. Exit the calibration procedure. Proceed to Test Step 3.

Test Step 3. CHECK FOR POWER AT THE SWITCH.

1. Do not disconnect the harness connector from the switch.

2. At the back of the harness connector for the switch, insert a 7X-1710 Multimeter Probe along contact 1 (wire X800-OR) for the voltage supply.

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

4. Measure the voltage from contact 1 (wire X800-OR) to contact 2 (wire J764-BR).

Expected Result:

The voltage is 8 VDC.

Results:

• OK - The voltage is 8 VDC. Proceed to Test Step 4.

• NOT OK - The voltage is NOT 8 VDC. The circuit is open.

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

  STOP

Test Step 4. CHECK THE SIGNAL OF THE SWITCH.

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

2. The 7X-1710 Multimeter Probe remains along contact 2 (wire J764-BR).

3. At the back of the harness connector for the switch, insert the other 7X-1710 Multimeter Probe along contact 3 (wire M965-GN).

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

5. Monitor the signal of the switch with the 146-4080 Digital Multimeter .

6. Manipulate the switch through the full operating range of the switch.

   Note: Follow the correct procedure for Testing the Switch Range. See Testing and Adjusting, "Calibration" for more information.

Expected Result:

The switch signal responds in the manner that is described at the beginning of this procedure. The CID 2530 FMI 04 is not active at the maximum range of the switch.

Results:

• OK - The switch signal responds correctly. The switch is operating correctly. Proceed to Test Step 5.

• NOT OK - The switch signal does not respond correctly. The switch is NOT operating correctly.

  Repair: Replace the switch.

  STOP

Test Step 5. CHECK THE SIGNAL AT THE ECM.

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

2. Insert the 7X-1710 Multimeter Probes into the back of the ECM connector along J2-41 (wire M965-GN) and J1-45 (wire J764-BR).

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

4. Monitor the signal of the switch with the 146-4080 Digital Multimeter .

5. Manipulate the switch through the full operating range of the switch.

   Note: Follow the correct procedure for Testing the Switch Range. See Testing and Adjusting, "Calibration" for more information.

Expected Result:

The switch signal responds in the manner that is described at the beginning of this procedure. The CID 2530 FMI 04 is not active at the maximum range of the switch.

Results:

• OK - The switch signal responds correctly. The switch is operating correctly. Proceed to Test Step 6.

• NOT OK - The switch signal does not respond correctly. The harness has failed.

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

  STOP

Test Step 6. CHECK THE SIGNAL CIRCUIT FOR A SHORT IN THE HARNESS.

1. The key start switch and the disconnect switch remain in the OFF position.

2. Disconnect the machine harness connectors from the switch and the ECM.

3. Measure the resistance between contact J2-41 (wire M965-GN) and all 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 of the resistance measurements are greater than 5000 ohms. The circuit is correct. Proceed to Test Step 7.

• NOT OK - The resistance is less than 5 ohms. The signal circuit is shorted to another circuit in the harness.

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

  STOP

Test Step 7. CHECK IF THE DIAGNOSTIC CODE REMAINS

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

2. Reconnect all harness connectors.

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

4. Operate the machine and manipulate the switch through the operating range of the switch.

5. Check the status of the CID 2530 FMI 04.

Expected Result:

The CID 2530 FMI 04 is not active at the maximum range of the switch.

Results:

• OK - The CID 2530 FMI 04 is not active at the maximum range of the switch. The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor connection or a short at one of the connectors that was disconnected and reconnected. Resume normal operation.STOP

• NOT OK - The CID 2530 FMI 04 is active at the maximum range of the switch. The diagnostic code has not been corrected. The ECM may have failed.

  Repair: Prior to replacing an ECM, always contact your dealership Technical Communicator for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM must be replaced, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP