450E Backhoe Loader Machine Electronic Control System MID 039 - CID 2531 - FMI 03 Caterpillar

Conditions Which Generate This Code:

Illustration 1	g01446802
Schematic of the Hoe Right (Machine) Joystick Thumbwheel Position Sensor

This diagnostic code is associated with the Hoe Right (Machine) Joystick Thumbwheel Position Sensor. The FMI 03 means that the ECM has determined that the voltage of the solenoid circuit is above normal.

The possible causes of the diagnostic code are listed:

• The switch has failed.

• The energize circuit of the solenoid is shorted to the +battery circuit.

• 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.

Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 2531 FMI 03 is active before performing this procedure.

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

Test Step 1. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO THE +BATTERY CIRCUIT.

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

2. Disconnect the J1 and J2 machine harness connectors from the ECM.

3. Disconnect the harness connector from the solenoid.

4. At the machine harness connector for the ECM, measure the resistance from contact J1-44 (wire X800-OR) to 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 resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 2.

• NOT OK - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between contact J1-44 (wire X800-OR) and the circuit that has a low resistance measurement.

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

  STOP

Test Step 2. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE.

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

5. Determine if the CID 2531 FMI 03 is active.

Expected Result:

The CID 2531 FMI 03 is active.

Results:

• YES - The CID 2531 FMI 03 is active. The problem 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 AVSpare. This consultation may greatly reduce repair time. If the ECM must be replaced, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP

• NO - The CID 2531 FMI 03 is not active. The problem 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. Resume normal machine operation.

  STOP