450E Backhoe Loader Machine Electronic Control System MID 039 - CID 2236 - FMI 05 Caterpillar

Conditions Which Generate This Code:

Illustration 1	g01216768
Schematic of the Hoe Auxiliary Valve #1 Port A Solenoid

This diagnostic code is associated with the Hoe Auxiliary Valve #1 Port A Solenoid. 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 solenoid is open.

• The return circuit of the solenoid is open.

• The solenoid has failed.

• 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 2236 FMI 05 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 system will not initialize after power is cycled.

• The hydraulic functions for extend, retract, reverse, and forward are lost after power is cycled.

• There will be no effect to the systems after powerup until the next reset of the valve ECM.

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 solenoid with the active diagnostic code from the machine harness.

3. At the machine harness connector for the solenoid, place a jumper wire from contact 1 (wire T969-YL) to contact 2 (wire E540-PK).

4. Observe the status of the CID 2236 FMI 05.

Expected Result:

The CID 2236 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• NO - The diagnostic is no longer active.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 solenoid has failed.

  Repair: The solenoid has failed. Repeat this Test Step "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid. Verify that the new solenoid 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 connectors 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 1 (wire T969-YL) to contact 2 (wire E540-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 1 (wire T969-YL) or in contact 2 (wire E540-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 2236 FMI 05.

Expected Result:

The CID 2236 FMI 05 is active.

Results:

• YES - The CID 2236 FMI 05 is active. The diagnostic code 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 2236 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