TA19 and TA22 Transmissions Power Train Electronic Control System Caterpillar

Illustration 1	g01366153
Connections of the parking brake solenoid 2

This diagnostic code is associated with the parking brake solenoid 2. The FMI 05 means that the ECM has determined that the current of the solenoid is below normal.

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. 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 1610 FMI 05 is active before performing this procedure.

Note: Use a digital multimeter for the measurements in this procedure.

System Response:

The ECM will disable the circuit for the solenoid valve. The parking brake will engage.

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 B to contact A.

4. Observe the status of the diagnostic code.

Expected Result:

The FMI 05 remains active. The diagnostic code has not changed and the "FMI 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• NO - The diagnostic is no longer active.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 connector(s) 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 J2-44 to contact J2-36.

Expected Result:

The resistance is 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 5000 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness.

  Repair: The open is in contact J2-44 or in contact J2-36 of the machine harness. 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 J2 connector for the ECM, use a wire removal tool to remove wire F923-YL(Yellow) from contact J2-44.

3. Reconnect the machine harness connectors to the ECM.

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

5. Use a multimeter probe that is not connected to a multimeter or a similar device to make contact with the ECM at contact J2-44 through the empty space in the J2 connector.

6. Observe the status of the diagnostic code. Ground the other end of the multimeter probe to frame ground.

Expected Result:

The FMI 05 changes to a FMI 06 when the pin is grounded at contact J2-44.

Results:

• YES - The FMI 05 changes to a FMI 06 when the pin is grounded at contact J2-44. The ECM has responded correctly to the condition of a grounded circuit. The operation of the ECM is correct. Reinstall the disconnected wire into the correct spot in the ECM connector before proceeding to the next Test Step. Proceed to Test Step 4.

• NO - The FMI 05 remains active. The status of the active diagnostic code does not change when contact J2-44 is grounded.

  Repair: The ECM has not responded correctly to the condition of a grounded circuit. The operation of the ECM is not correct.

  Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacing, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP

Test Step 4. CHECK IF THE DIAGNOSTIC CODE REMAINS.

1. Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation that is caused by excessive heat, battery acid, or chafing.

2. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.

3. Reconnect all harness connectors. Make sure that the harness connectors are fully seated and that the clips for each connector are completely fastened.

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

5. Operate the vehicle.

6. Check the status of the diagnostic code.

Expected Result:

The diagnostic code is active.

Results:

• YES - The diagnostic code is active. The diagnostic code has not been corrected.

  Repair: Check the circuit again. It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacing, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP

• NO - The diagnostic code is not active. The diagnostic code does not exist at this time. 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 vehicle operation.

  STOP