D6N Track-Type Tractor Caterpillar

Illustration 1	g02653958
Forward clutch solenoid connections

Illustration 2	g02728836
Location of the forward clutch solenoid (No. 2)

This diagnostic code is associated with the forward clutch solenoid. The FMI 05 means the electronic control module (ECM) has determined that an open exists in the circuit for the solenoid.

The possible causes of this diagnostic code are listed below:

• The energize circuit of the solenoid is open

• The return circuit of the solenoid is open.

• The solenoid has failed.

• The ECM has failed.ECM failure is unlikely.

Note: The following 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 1402 FMI 05 is active before performing this procedure.

Use a calibrated digital multimeter for the measurements in these procedures.

System Response:

When this code is active, the implement lockout solenoid is deactivated (LOCKED) unless the limp home mode is selected. All implement functions are disabled.

Test Step 1. CHECK THE SOLENOID

1. Turn the disconnect switch and the key start switch to the ON position. DO NOT start the engine.

2. Disconnect the forward clutch solenoid from the machine harness.

3. At the machine harness connector for the solenoid, place a jumper wire from contact "1" (wire 751-GN) to contact "2" (wire 975-WH).

4. Observe the status of the CID 1402 FMI 05.

Expected Result:

The active diagnostic code changes from an FMI 05 to an FMI 06 diagnostic code as the jumper wire is installed.

Results:

• YES - The active diagnostic code changes from an FMI 05 to an FMI 06 diagnostic code when the jumper wire is installed. The solenoid has failed.

  Repair: Repeat this Test Step "CHECK THE SOLENOID" in order to verify that the solenoid has failed. Replace the solenoid. Verify that the new solenoid corrects the problem.

  STOP

• NO - The CID 1402 FMI 05 diagnostic code remains active. The jumper wire does not affect the status of the diagnostic code. The solenoid is not causing the problem. Proceed to Test Step 2

Test Step 2. CHECK THE HARNESS FOR AN OPEN

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

2. Disconnect the machine harness connectors from the ECM.

3. The jumper wire that was installed in the previous test step remains in place.

4. At the machine harness connector, measure the resistance from signal contact "J1-66" (wire 751-GN) to "J1-55" (wire 975-WH).

Expected Result:

The resistance should be less than 5.0 ohms.

Results:

• OK - The resistance is less than 5.0 ohms. The machine harness is correct. Proceed to Test Step 3.

• NOT OK - The resistance is greater than 5.0 ohms. The resistance measurement is not correct.

  Repair: A resistance measurement that is much greater than 5 ohms but less than 5000 ohms could indicate that one of the connection points in the circuit is not open, but is not a good connection.There is an open circuit or a bad connection in the machine harness. The problem is in the signal wire 751-GN or in the return wire 975-WH of the machine harness. Refer to the complete machine Electrical Schematic and check all harness connectors that are in this circuit. Ensure that all connector contacts are clean, tight and in good condition. Repair the machine harness or replace the machine harness.

  STOP

Test Step 3. CHECK THE OPERATION OF THE ECM

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

1. Remove the jumper wire that was installed in the last test step.

2. At the machine harness connector "J1" for the ECM, use a 151-6320 Removal Tool to remove the solenoid energize wire 751-GN and socket at contact "J1-66" from the harness connector.

3. Reconnect the machine harness "J1" and "J2" connectors to the ECM.

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

5. Use a 7X-1710 Multimeter Probe that is not connected to a multimeter or a similar device to contact the ECM pin at "J1-66"at "J1" connector.

6. While observing the status of the active CID 1402 FMI 05 diagnostic code, ground the other end of the 7X-1710 Multimeter Probe to frame ground.

Expected Result:

The CID 1402 FMI 05 diagnostic code is no longer active. A CID 1402 FMI 06 diagnostic code becomes active when the ECM pin at "J1-66" is grounded.

Results:

• YES - The CID 1402 FMI 05 diagnostic code is no longer active. A CID 1402 FMI 06 diagnostic code has been activated after the ECM pin is grounded. The ECM has responded correctly to the grounded circuit condition in the solenoid circuit. The ECM is most likely not causing the problem.
  
  Reinstall the disconnected solenoid energize wire back into the correct spot in the ECM connector before proceeding to the next test step.
  
  Proceed to Test Step 4.

• NO - The CID 1402 FMI 05 diagnostic code remains active. The status of the active diagnostic code does not change when the ECM pin for the solenoid is grounded.

  Repair: The ECM has not responded correctly to the grounded condition in the solenoid circuit. The operation of the ECM is not correct.If the cause of the problem is not found, the ECM may have failed. Prior to replacing an ECM, always contact the technical communicator at your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the cause of the diagnostic code is not found and the ECM must be replaced, refer to the Troubleshooting, "Electronic Control Module (ECM) - Replace" Section of this manual for details.

  STOP

Test Step 4. CHECK THE STATUS OF THE DIAGNOSTIC CODE

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

2. Reconnect all harness connectors.

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

4. Clear all inactive diagnostic codes.

5. Operate the machine.

6. Check the status of the CID 1402 FMI 05 diagnostic code.

Expected Result:

The CID 1402 FMI 05 diagnostic code is active.

Results:

• YES - The CID 1402 FMI 05 diagnostic code is active. The diagnostic code has not been corrected.

  Repair: Check the solenoid circuit again. Use the Caterpillar Electronic Technician (Cat ET) service tool in order to perform a wiggle test on the machine wiring harness. The wiggle test can detect momentary or intermittent shorts or opens in the machine wiring harness.If the cause of the problem is not found in the machine harness, the ECM may have failed. ECM failure is unlikely. The ECM responded correctly to the grounded condition in the previous test step.Verify that all possible causes of the diagnostic code have been investigated. Exit this procedure and perform this procedure again.If the cause of the problem is not found, the ECM may have failed. Prior to replacing an ECM, always contact the technical communicator at your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the cause of the diagnostic code is not found and the ECM must be replaced, refer to the Troubleshooting, "Electronic Control Module (ECM) - Replace" Section of this manual for details.

  STOP

• NO - The CID 1402 FMI 05 is not active. The diagnostic code does not exist at this time.

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

  STOP