M313C, M315C, M316C, M318C, M318C MH, M322C and M322C MH Excavators Electronic System MID 039 - CID 0291 - FMI 06 Caterpillar

Conditions Which Generate This Code:

Illustration 1	g00840395
Schematic of the Solenoid (engine cooling fan)

This diagnostic code is associated with the Solenoid (engine cooling fan). The FMI 06 means that the machine ECM has determined that the current of the solenoid is above normal.

The possible causes of this diagnostic code are listed:

• The energize circuit of the solenoid is shorted to ground.

• The solenoid has failed.

• The machine 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 0291 FMI 06 is active before performing this procedure.

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

System Response:

When this diagnostic code is active, the machine ECM will not be able to control the solenoid. The solenoid (demand fan) will not receive current. This causes the demand fan to rotate at the maximum fan speed.

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. Observe the status of the diagnostic code.

3. Disconnect the solenoid with the active diagnostic code from the machine harness.

Expected Result:

CID 0291 FMI 06 changes to CID 0291 FMI 05 when the solenoid is disconnected.

Results:

• YES - CID 0291 FMI 06 changes to CID 0291 FMI 05 when the solenoid is disconnected. The circuit is correct.

  Repair: The solenoid has failed. Repeat this test "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid.

  Stop.

• NO - CID 0291 FMI 06 remains active. Proceed to Test Step 2.

Test Step 2. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO GROUND.

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

2. The solenoid remains disconnected from the machine harness.

3. Disconnect the machine harness connector(s) from the machine ECM.

4. At the machine harness connector, measure the resistance from the signal contact J2-24 (wire C411-OR) to all contacts that are used in the machine harness connectors for the machine ECM.

Expected Result:

Each resistance measurement is greater than 5000 ohms.

Results:

• OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.

• NOT OK - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between J2-24 (wire C411-OR) and the circuit with the low resistance measurement.

  Repair: Repair the machine harness or replace the machine harness.

  Stop.

Test Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.

1. Inspect the harness connectors and clean the contacts of 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 0291 FMI 06.

Expected Result:

The CID 0291 FMI 06 is active.

Results:

• YES - The CID 0291 FMI 06 is active. The diagnostic code has not been corrected. The machine ECM may have failed.

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

  Stop.

• NO - The CID 0291 FMI 06 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 or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.

  Stop.