Air Conditioning and Heating R134a for All Caterpillar Machines – MID 082 – CID 1882 – FMI 08

Conditions Which Generate This Code:



Illustration 1 g03327829

Schematic of the “Winch Control Handle Drum Position” sensor

The CID 1882 diagnostic code is associated with the winch drum position sensor. The FMI 08 means that the Implement ECM reads the duty cycle of the sensor as being out of range.

The position sensor is a PWM sensor that operates at a frequency of approximately 500 Hz. The sensor has an operating duty cycle of 10% to 90%.

Note: This diagnostic code is usually an intermittent condition. The diagnostic code may be active or the diagnostic code may not be active.

The possible causes of this condition are listed below:

  • The signal circuit is shorted to the +battery or the signal circuit is shorted to ground intermittently.

  • The signal circuit is open intermittently or the sensor is disconnected.

  • The sensor may have failed.

System Response:

  • A level 2 warning will be generated.

  • All functions for the release of the drum for the winch are disabled.

  • The “Limp Home” option is available.

Note: This procedure can cause new diagnostic codes to be recorded. Ignore these created diagnostic codes. When the procedure is completed, clear the created diagnostic codes.

Test Step 1. CHECK FOR POWER AT THE SENSOR.

  1. Do not disconnect the harness connector from the sensor.
  1. At the back of the harness connector for the sensor, insert a 7X-1710 Multimeter Probe along contact 1 (wire 176-YL) for the voltage supply.
  1. Turn the key start switch and the disconnect switch to the ON position.
  1. Measure the voltage from contact 1 (wire 176-YL) to contact 2 (wire 210-BK).

Expected Result:

The voltage is 10 VDC.

Results:

  • OK – The voltage is 10 VDC. Proceed to Test Step 3.

  • NOT OK – The voltage is not 10 VDC. The circuit is open.

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

    STOP

Test Step 2. CHECK THE SIGNAL CIRCUIT OF THE SENSOR.

  1. Turn the key start switch and the disconnect switch to the OFF position.
  1. At the back of the harness connector for the sensor, remove the 7X-1710 Multimeter Probe from contact 1. Insert the probe along the signal wire (contact 3).
  1. At the back of the harness connector for the sensor, insert the 7X-1710 Multimeter Probe along the ground wire (contact 2).
  1. Turn the disconnect switch and the key start switch to the ON position.
  1. Monitor the signal of the sensor with the 146-4080 Digital Multimeter .
  1. Without disconnecting the sensor or the hardware that is associated with the sensor from the machine, take the sensor through the full operating range.

Expected Result:

The sensor signal responds in the manner that is described at the beginning of this procedure.

Results:

  • OK – The sensor signal responds correctly. The sensor is operating correctly. Proceed to Test Step 3.

  • NOT OK – The sensor signal does not respond correctly. The sensor is NOT operating correctly.

    Repair: Replace the sensor and perform the calibration procedure for the position sensors of the “winch control handle”. See the Testing and Adjusting, “Calibration” procedure in the service manual for your machine. Verify that the new sensor corrected the problem.

    STOP

Test Step 3. CHECK THE SIGNAL CIRCUIT AT THE ECM

  1. Turn the key start switch and the disconnect switch to the OFF position.
  1. Insert the 7X-1710 Multimeter Probes into the back of the ECM connector along J2-41 (wire F869-PK) and J1-13 (wire 210-BK).
  1. Turn the disconnect switch and the key start switch to the ON position.
  1. Monitor the signal of the sensor with the 146-4080 Digital Multimeter .
  1. Without disconnecting the sensor or the hardware that is associated with the sensor from the machine, take the sensor through the full operating range.

Expected Result:

The sensor signal responds in the manner that is described at the beginning of this procedure.

Results:

  • OK – The sensor signal responds correctly. The sensor is operating correctly. Proceed to Test Step 4.

  • NOT OK – The sensor signal does not respond correctly. The harness has failed.

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

    STOP

Test Step 4. CHECK THE SIGNAL CIRCUIT FOR A SHORT IN THE HARNESS

  1. The key start switch and the disconnect switch remain in the OFF position.
  1. Disconnect the machine harness connectors from the sensor and the ECM.
  1. Measure the resistance between contact J2-41 (wire F869-PK) and all contacts that are used in the machine harness connectors for the ECM.

Expected Result:

The resistance is greater than 5000 ohms.

Results:

  • OK – The resistance is greater than 5000 ohms. The circuit is correct. Proceed to Test Step 5.

  • NOT OK – The resistance is less than 5 ohms. The signal circuit is shorted to another circuit in the harness.

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

    STOP

Test Step 5. CHECK THE STATUS OF THE DIAGNOSTIC CODE

  1. Inspect the harness connectors and clean the contacts of the harness connectors that are in the affected circuit. Check the wires for damage to the insulation that can be caused by excessive heat or chafing.
  1. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the switch circuit.
  1. Reconnect all harness connectors. Make sure that the connectors are fully seated and the clips for each connector are fastened.
  1. Turn the disconnect switch and the key start switch to the ON position.
  1. Determine if the CID 1882 FMI 08 diagnostic code is active.

Expected Result:

The CID 1882 FMI 08 diagnostic code is not active.

Results:

  • OK – The CID 1882 FMI 08 diagnostic code is not active. The diagnostic code does not exist at this time. The initial diagnostic code may have been caused by a poor electrical connection that was corrected when a harness connector was disconnected and reconnected.

    Repair: Resume normal operation.

    STOP

  • NOT OK – The CID 1882 FMI 08 diagnostic code is active. The problem has not been corrected.

    Repair: With Caterpillar Electronic Technician (Cat ET), if available, perform a “Wiggle Test” on the sensor circuit in the machine wiring harness. The wiggle test may detect momentary or intermittent shorts or opens in the machine wiring harness.If all possible causes of the problem have been investigated and no problem can be found, you may need to replace the Implement ECM.Prior to replacing an ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time and expense. If the ECM must be replaced, refer to Testing and Adjusting, “Electronic Control Module (ECM) – Replace”.

    STOP

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