450E Backhoe Loader Machine Electronic Control System MID 039 - CID 1406 - FMI 03 Caterpillar

Conditions Which Generate This Code:

Illustration 1	g01445907
Schematic of the Transmission Solenoid 6 (Speed 3)

This diagnostic code is associated with the Transmission Solenoid 6 (Speed 3). 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 solenoid has failed.

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

• The ECM may have failed.

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 1406 FMI 03 is active before performing this procedure.

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

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 1406 FMI 03 will be logged in the internal memory of the Machine ECM.

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 ON position.

2. Disconnect the wires from the back of the connector at the ECM.

3. At the machine harness connector for the solenoid, measure the voltage from contact 1 (wire 902-BR) to frame ground. At the machine harness connector for the solenoid, measure the voltage from contact 2 (wire 975-WH) to frame ground.

Expected Result:

The voltage is 0 VDC.

Results:

• OK - There are no shorts in the wires. Proceed to Test Step 2.

• NOT OK - A voltage is present in the wires. There is a short in the machine harness or in the wires. The short is to a separate voltage source.

  Repair: Repair the machine harness or replace the machine harness. Ensure that the fix has corrected the problem.

  STOP

Test Step 2. CHECK THE OPERATION OF THE ECM.

The disconnect switch and the key start switch remain in the OFF position. The machine harness connectors for the solenoid and the ECM remain disconnected.

1. Use a wire removal tool in order to remove the energize wire for the solenoid from the machine harness connector for the ECM. Remove (wire 975-WH) and the socket at connector contact J2-4 from the machine harness connector.

2. Reconnect the machine harness connectors to the ECM.

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

4. Observe the status of the active diagnostic code.

Expected Result:

The diagnostic code of FMI03 changes to an FMI 05.

Results:

• OK - The FMI 03 changes to an FMI05. The FMI 05 was activated after the energize circuit for the solenoid was disconnected. The ECM has responded correctly to the condition of an open circuit in the solenoid circuit. Reconnect the disconnected wire. Wire (975-WH) connects to the ECM at connector contact J2-4. Proceed to Test Step 3.

• NOT OK - The FMI 03 does not change to an FMI 05. The active diagnostic code did not change after the energize wire for the solenoid was disconnected from the ECM.

  Repair: The ECM has not responded correctly to the condition of an open circuit in the solenoid circuit. The operation of the ECM is not correct. The ECM may have failed. Prior to replacing an ECM, always contact your dealership for possible consultation with AVSpare. This consultation may greatly reduce repair time. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP

Test Step 3. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE.

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, corrosion, or chafing.

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

3. 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 fastened.

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

5. Operate the machine.

6. Determine if the CID 1406 FMI 03 is active.

Expected Result:

The CID 1406 FMI 03 is active.

Results:

• YES - The CID 1406 FMI 03 is active. The problem has not been corrected.

  Repair: Check the circuit again. Use the Cat ET service tool in order to perform a "Wiggle Test" on the machine wiring harness. The "Wiggle Test" can detect shorts and opens in the machine wiring harness that are momentary or intermittent.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 1406 FMI 03 is not active. The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors.

  Repair: The problem does not exist at this time. Resume normal machine operation.

  STOP