416E, 420E and 430E Backhoe Loaders MID 053 - CID 2652 - FMI 05 Caterpillar

Conditions Which Generate This Code:

Illustration 1	g01317076

This diagnostic code is associated with the extend relay valve. The FMI 05 means that the ECM has determined that an open in the circuit exists.

The possible causes of this diagnostic code are listed below:

• The energize circuit of the relay is open.

• The return circuit of the relay is open.

• The relay has failed.

• The ECM has failed. This is unlikely.

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 2652 FMI 05 is active before performing this procedure.

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

Test Step 1. CHECK THE RELAY.

1. Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.

2. Disconnect the relay with the active diagnostic code from the machine harness.

3. At the machine harness connector for the relay, place a jumper wire from contact 5 (wire K753-OR) to contact 2 (wire K754-PK).

4. Observe the status of the CID 2652 FMI 05.

Expected Result:

The CID 2652 FMI 05 remains active. The FMI has not changed and the "05" is still active.

Results:

• YES - The diagnostic code remains active. The jumper wire does not affect the diagnostic code. Proceed to Test Step 2.

• NO - The diagnostic is no longer active. The relay has failed.

  Repair: The relay has failed. Repeat this Test Step "CHECK THE RELAY" in order to verify the relay failure. Replace the relay. Verify that the new relay corrects the problem.

  STOP

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 connector(s) from the machine 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 5 (wire K753-OR) to contact 2 (wire K754-PK).

Expected Result:

The resistance is less than 5 ohms.

Results:

• OK - The resistance is less than 5 ohms. The machine harness is correct. Proceed to Test Step 3.

• NOT OK - The resistance is greater than 5 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness.

  Repair: The open is in contact 5 (wire K753-OR) or in contact 2 (wire K754-PK) of the machine harness. Repair the machine harness or replace the machine harness.

  STOP

Test Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.

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. Operate the machine.

5. Check the status of the CID 2652 FMI 05.

Expected Result:

The CID 2652 FMI 05 is active.

Results:

• YES - The CID 2652 FMI 05 is active. The diagnostic code has not been corrected. The ECM may have failed.

  Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. Replace the machine ECM if the cause of the diagnostic code is not found. See Troubleshooting, "Electronic Control Module (ECM) - Replace".

  STOP

• NO - The CID 2652 FMI 05 is not active. The diagnostic code does not exist at this time.

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

  STOP