259D Compact Track Loader – MID 039 – CID 0364 – FMI 08

Conditions Which Generate This Code:

This diagnostic code is recorded when the ECM reads the input signal from the Lift Cylinder Head End Pressure Sensor and determines that the signal frequency or the signal pulse width is not within the expected range.

The sensor is a PWM sensor that operates at a frequency of approximately 500Hz ± 100Hz. The sensor sends a PWM input signal to the ECM. The duty cycle of the signal will vary from 3% to 97%.

If the PWM frequency is outside the 500Hz ± 100HZ operating range, an FMI 08 diagnostic code will be activated.

• Intermittent connections or poor connections in the wire harness.

• The sensor has failed.

• The ECM has failed. ECM failure is unlikely.

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. Inspect the connections for the following:

• Connections are clean.

• Connections are secure.

• Connections are in good condition.

Note: 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 implements will stop working until the right-hand joystick is returned to the center position. After the joystick has been centered, the implements will behave normally, but the Self Level, Return-to-Dig, and Work Tool Positioner features will be disabled. The green Self Level icon on the machine left-hand display will no longer light up when the Self Level cab switch is turned on. In the case of an intermittent fault, these features will be disabled until the next key cycle.

Note: If a CID 0041 diagnostic code for the 8V power supply has been activated, correct the problem before proceeding with this procedure.

Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the problem has been corrected.

Note: A digital multimeter is required for taking measurements in this procedure.

Test Step 1. CHECK THE DUTY CYCLE AND THE SIGNAL FREQUENCY AT THE SENSOR

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

2. At the machine harness connector for the sensor, use a 151-6320 Removal Tool to remove the signal wire E416-PU and the socket at contact 3 from the harness connector. The machine harness connector remains connected to the sensor.

3. At the back of the sensor connector, insert 7X-1710 Multimeter Probes along the ground contact 2 and the signal contact 3.

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

5. Measure the frequency of the signal from the sensor.

6. Observe the measurement and wiggle the sensor connector. Gently pull on the wires and wiggle the wires.

7. Measure the duty cycle of the sensor at the connector pins between the contacts 2 and 3. Check that the sensor is within range according to the description at the beginning of this procedure.

Expected Result:

The frequency and duty cycle of the signal are correct according to the description at the beginning of this procedure. The frequency and the duty cycle are stable during the manipulation of the harness connector and the wiring.

Results:

• OK - The signal frequency and the duty cycle of the sensor are correct. The sensor is not the cause of the problem. Proceed to Test Step 2.

• NOT OK - The signal frequency or the duty cycle of the sensor is not correct according to the description at the beginning of this procedure. The sensor has failed.

  Repair: Perform this test step again in order to verify that the sensor signal is not correct.The operation of the sensor is not correct. Replace the sensor. After replacement, verify that the operation is correct before operating the machine.

  STOP

Test Step 2. CHECK FOR AN OPEN IN THE SENSOR CIRCUIT

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

2. Reconnect the wire and the socket, removed in the previous test step, into the original locations in the sensor connector. Verify that all wires of the sensor circuit are secure in the connector.

3. Disconnect the machine harness connector from the sensor. At machine harness connectors, place a jumper wire between the signal contact 3 (wire E416-PU) and frame ground.

   Note: Ensure that the frame ground contact point is clean and free of paint, oil, dirt, and any other debris.

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

5. Observe the status of the active CID 0364 FMI 08 diagnostic code.

Expected Result:

The active diagnostic code CID 0364 FMI 08 is no longer active. A CID 0364 FMI 04 diagnostic code becomes active when the signal wire (E416-PU) is grounded.

Results:

• YES - The active diagnostic code CID 0364 FMI 08 is no longer active. A CID 0364 FMI 04 diagnostic code has been activated after the signal wire is grounded. Proceed to Test Step 3.

• NO - The CID 0364 FMI 08 diagnostic code remains active. The status of the active diagnostic code does not change when the signal wire is grounded. There is an open or a poor connection in the signal wire.

  Repair: Check the signal circuit for an open or for a poor connection. Repair or replace the machine harness.

  STOP

Test Step 3. CHECK THE STATUS OF THE DIAGNOSTIC CODE

1. Perform the following:
   • Visually inspect the harness connectors.

   • Clean the contacts of the harness connectors.

   • Visually inspect the insulation of the wires for damage that can be caused by excessive heat, battery acid, or chafing.

2. Perform a 45 N (10 lb) pull test at the connectors that are used in the circuit.

3. Reconnect all harness connectors. Verify the following:
   • The connectors are fully seated.

   • The clips for each connector are fastened.

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

5. Check the status of the CID 0364 FMI 08.

Expected Result:

The CID 0364 FMI 08 is not active.

Results:

• OK - The CID 0364 FMI 08 is not active. The diagnostic code does not exist at this time. The initial diagnostic code could have been caused by a poor connection or a short at one of the connectors that was disconnected and reconnected. Resume normal operationSTOP

• NOT OK - The CID 0364 FMI 08 is active. The diagnostic code has not been corrected.

  Repair: If available, perform a Wiggle Test on the machine wiring harness with the Caterpillar Electronic Technician (Cat ET) service tool. The Wiggle Test can detect the following in the machine wiring harness:

  • Momentary shorts

  • Intermittent shorts

  • Opens

  If the cause of the active diagnostic code is not found, the ECM that has activated this diagnostic code may have failed. Exit this procedure and perform this procedure again. If the cause of the failure is not found, contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. If the ECM must be replaced, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP