D6N Track-Type Tractor Caterpillar

Illustration 1	g02727927
Air Conditioner Compressor Clutch solenoid connections

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Air Conditioner Compressor Clutch solenoid location

A CID2671 FMI 05 diagnostic code is associated with the Air Conditioner Compressor Clutch solenoid. An FMI 05 means that the Machine ECM has determined that the current in the solenoid circuit is below normal.

The possible causes of this diagnostic code are listed below:

• Solenoid failure.

• Open solenoid circuit.

• Grounded solenoid circuit.

• Machine ECM failure. ECM failure is unlikely.

Note: Poor connections are often the cause of a problem in electrical circuits. Before performing this procedure, inspect all the machine harnesses and connectors involved in the circuit. Make sure to verify that all of the connections in the circuit are clean, secure, and in good condition. Correct any problems found with any of the connections. Verify the diagnostic code CID 2671 FMI 05 is still active, before continuing with this procedure.

Note: The following test procedure may create other diagnostic codes. Ignore all the created diagnostic codes now, but clear all those codes after the cause for the original diagnostic code has been corrected.

Test Step 1. CHECK THE SOLENOID, THE ECM, AND THE HARNESS.

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

2. Disconnect the harness connector from the solenoid.

3. At the harness connector for the solenoid, place a jumper wire from the contact for wire E554-PK to the contact for wire F761-BR in the connector.

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

5. Observe the status of the CID 2671 FMI 05 diagnostic code.

Expected Result:

The diagnostic code remains active and does not change.

Results:

• YES - The diagnostic code remains active. The solenoid is not the problem. Go to Test Step 2.

• NO - The diagnostic is no longer active and has changed into an active CID 2671 FMI 06 diagnostic code. The solenoid has failed.

  Repair: Replace the solenoid.

  Go to Test Step 4.

Test Step 2. CHECK THE SOLENOID CIRCUIT FOR AN OPEN IN THE HARNESS.

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

2. The solenoid remains disconnected from the harness connector and the jumper wire stays in place.

3. Disconnect the J2 harness connector from the machine ECM.

4. At the ECM harness connector, measure resistance from contact J2-2 (wire E554-PK) to contact J2-4 (wire F761-BR).

Expected Result:

Resistance is less than 5 ohms.

Results:

• YES - Resistance is less than 5 ohms. There are no open circuits in the harness. Go to Test Step 3.

• NO - The resistance is greater than 5000 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness.

  Repair: The open is in wire E554-PK, or in wire F761-BR. Repair or replace the harness.

  Go to Test Step 4.

Test Step 3. CHECK THE SOLENOID CIRCUIT FOR A SHORT IN THE HARNESS.

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

2. The solenoid remains disconnected from the harness connector but the jumper wire is removed.

3. Disconnect the J2 harness connector from the machine ECM.

4. At the ECM harness connector, measure resistance from contact J2-2 (wire E554-PK) to all other contacts used in the J2 ECM harness connector.

Expected Result:

Resistance should be greater than 500ohms.

Results:

• YES - Resistance should be greater than 500ohms. There are no short circuits in the harness. Go to Test Step 4.

• NO - A resistance is less than (+/-) 5000 ohms. There is a short circuit in the harness.

  Repair: The short is from wire E554-PK, to the wire with the low resistance. Repair or replace the harness.

  Go to Test Step 4.

Test Step 4. CHECK THE DIAGNOSTIC CODE STATUS.

1. Remove the jumper wire from the solenoid harness connector.

2. Reconnect all harness connectors. Make sure all the connectors are clean, and fully seated. Make sure that the clips for each connector are securely fastened.

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. Observe the status of the CID 2671 FMI 05 diagnostic code.

Expected Result:

The diagnostic code is no longer active.

Results:

• YES - The diagnostic code is no longer active and does not exist at this time. The problem has been corrected.

  Repair: Return machine to normal operation

  STOP

• NO - The diagnostic code is still active. The problem has not been corrected.

  Repair: If you have not inspected the harness connectors in a previous Test Step, do that now. Clean the contacts of the harness connectors. Check the wires for damage to the insulation caused by excessive heat, battery acid, or chafing.Perform a 45 N (10 lb.) pull test on each of the wires that are associated with the sensor circuit.Perform a "wiggle test" on the sensor circuit of the machine wiring harness, using the Caterpillar Electronic Technician service tool. The "wiggle test" can be used to detect open or shorted connections in the machine wiring harness.Reconnect all harness connectors. Make sure that the connectors are fully seated. Observe that the clips for each connector are securely fastened. Perform Test Step 3 again. If the problem has NOT been found, and the original code is still active, the machine ECM may have failed.Prior to replacing an ECM, always contact your Dealership Technical Communicator for possible consultation with Caterpillar, or with the Dealer Solutions Network. This consultation may greatly reduce repair time. If the ECM needs to be replaced, see Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP