14L Motor Grader Implement Electronic Control System Caterpillar


MID 082 - CID 2146 - FMI 02

Usage:

14L B94
Conditions Which Generate This Code:


Illustration 1g03172818
Articulation Lever Position sensor connections

The "articulation lever position" sensor is located in the left assembly of the joystick. The sensor provides an input signal to the ECM. This diagnostic code is recorded when the ECM reads the input signal from the "articulation lever position" sensor and the signal is erratic or intermittent.

The articulation position sensor receives power from the 8V power supply of the Implement ECM. The articulation sensor is connected to ground at the 5V sensor return (ECM ground) of the Transmission/Chassis ECM and the Implement ECM. The articulation sensor must lose both power supplies or both ground connections in order to lose power. The illustration above indicates the power and ground connections for the articulation position sensor.

The position sensor is a PWM sensor that operates at a frequency of 500 ± 100 Hz. The position sensor sends a PWM input signal to the Implement ECM. The duty cycle of the signal will vary from approximately 10% at the joystick full articulate left position to approximately 90% at the joystick full articulate right position. When the joystick is in the center (neutral) position, the duty cycle will be approximately 50%.

The possible causes of this active diagnostic code are listed:

  • The sensor has failed.

  • Intermittent connections or poor connections exist in the sensor circuit.

  • The signal circuit is shorted to another circuit in the machine harness.

  • The ECM has failed. This is unlikely.

Note: If a CID 0041 diagnostic code for the 8V power supply has been activated by either the Transmission/Chassis ECM (MID 027) or the Implement ECM (MID 082), investigate the problem and fix the problem before proceeding with this procedure.

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, that all connections are secure and that all connections are 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.

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.

Test Step 1. CHECK THE SENSOR POWER SUPPLIES

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

  2. At the J1 harness connector for the left joystick, insert 7X-1710 Multimeter Probes along the +V1 power supply contact J1-1 (wire R800-OR(Orange)) and along ground 1 contact J1-3 (wire L731-BR(Brown)). Do not disconnect the machine harness from the J1 connector.

  3. Measure the DC voltage of the sensor power supply.

  4. At the J3 harness connector for the left joystick, insert 7X-1710 Multimeter Probes along the +V1 power supply contact J1-1 (wire 998-BR(Brown)) and along ground 4 contact J3-3 (wire 998-BR(Brown)). Do not disconnect the machine harness from the J1 connector.

  5. Measure the DC voltage of the sensor power supply.

Expected Result:

Each voltage measurement is approximately 8.0 ± 0.4 VDC.

Results:

  • OK. - Each voltage measurement is approximately 8.0 ± 0.4 VDC. The power supplies for the sensor are correct. Proceed to Test Step 2.

  • NOT OK. - One or both of the voltage measurements is less than 8.0 ± 0.4 VDC. The power supplies for the sensor are not correct.

    Repair: Either one or both of the ground wires of the sensor circuit or one or both of the sensor supply circuits is an open connection or a poor connection.

    Refer to the complete Electrical System Schematic of the machine. Examine all of the connectors that are in the circuits. Ensure that the connections are clean, that the connections are secure and that the connections are in good condition.

    For troubleshooting one or both of the separate ECM power supplies that provide power to the sensor, refer to the CID 0041 diagnostic code procedures in the troubleshooting section of the manual for the Transmission/Chassis ECM or the Implement ECM.

    Repair the faulty power supply circuit before proceeding with this procedure.

    STOP

Test Step 2. CHECK THE SIGNAL AT THE SENSOR

The key start switch and the disconnect switch remain in the OFF position.

  1. Inspect all of the harness connectors for the joystick and the ECM. Clean the contacts of the harness connectors and check the wires for damage to the insulation. Reconnect all harness connectors. Make sure that the connectors are fully seated. Observe that the clips for each connector are completely fastened.

  2. At the machine harness connector J2 for the left joystick, use a 151-6320 Removal Tool to remove the signal wire K758-BU(Blue) and socket at contact J2-1 from the harness connector. The machine harness connector J2 remains connected to the left connector of the joystick.

  3. At the back of the joystick connectors J1 and J2, insert 7X-1710 Multimeter Probes along the sensor signal contact J2-1 and the ground 1 contact at J1-3.

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

  5. Measure the duty cycle of the sensor between the connector contacts of the joystick J1-3 and J2-1. Rotate the joystick through the full range of the sensor that is described at the beginning of this procedure.

Expected Result:

The duty cycle of the "articulation lever position" sensor is correct according to the description at the beginning of this procedure.

Results:

  • OK. - The duty cycle of the sensor is correct. The sensor is not the cause of the problem. Reconnect the signal wire and the socket in the machine harness connector for the joystick. Proceed to Test Step 3.

  • NOT OK. - The duty cycle of the "articulation lever position" 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.

    If the "articulation lever position" sensor signal is not correct according to the description at the beginning of this procedure, replace the left assembly of the joystick. After replacement of the assembly of the joystick, verify that the operation of the new assembly of the joystick is correct before operating the machine.

    STOP

Test Step 3. CHECK THE SIGNAL AT THE ECM

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

  2. At the machine harness connector J1 for the Implement ECM, insert a multimeter probe along return contact J1-21 (wire 998-BR(Brown)). At the machine harness connector J2 for the Implement ECM, insert a multimeter probe along signal contact J2-26 (wire U758-BU(Blue)). The machine harness connectors remain connected to the ECM.

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

  4. Measure the duty cycle of the sensor between the connector contacts of the ECM J1-21 and J2-26. Move the joystick through the full range of the sensor that is described at the beginning of this procedure.

Expected Result:

The duty cycle of the "articulation lever position" sensor is correct according to the description at the beginning of this procedure.

Results:

  • OK. - The duty cycle of the sensor is correct at the ECM. The machine harness does not appear to be the cause of the problem. An intermittent open or a short could still be causing the problem. Proceed to Test Step 4.

  • NOT OK. - The duty cycle of the "articulation lever position" sensor is NOT correct at the ECM connector according to the description at the beginning of this procedure. There is a problem in the machine harness.

    Repair: The "articulation lever position" sensor signal circuit in the machine harness is not correct. Refer to the complete Electrical System Schematic of the machine. Examine all of the connectors that are in the sensor signal circuit. Verify that the connections are clean, that the connections are secure and that the connections are in good condition. Repair the machine harness or replace the machine harness.

    STOP

Test Step 4. CHECK THE SIGNAL CIRCUIT FOR A SHORT

The key start switch and the disconnect switch remain in the OFF position. The machine harness connectors for the joystick remain disconnected.

  1. Remove the jumper wire that was installed in the last step.

  2. At the J2 machine harness connector for the Implement ECM, measure the resistance from the sensor signal contact J2-26 (wire K758-BU(Blue)) to all of the other J1 and J2 contacts that are used for the Implement ECM.

Expected Result:

Each resistance measurement is greater than 5kΩ.

Results:

  • OK. - Each resistance measurement is greater than 5kΩ. The resistance measurements do not indicate a short in the circuit. Proceed to Test Step 5.

  • NOT OK. - A resistance measurement is less than 5kΩ.

    Repair: There is a short in the machine harness. The short is between the signal circuit and the circuit with the low resistance measurement.

    Refer to the complete Electrical System Schematic of the machine. Check all of the connectors that are in the sensor circuit. Ensure that all connections are clean, that all connections are secure and that all connections are in good condition.

    For information on testing for short circuits and finding short circuits, refer to Testing and Adjusting, "Wiring Harness (Short Circuit) - Test". 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. Clean the contacts of the harness connectors. 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 sensor circuit.

  3. Reconnect all harness connectors. Make sure that the connectors are fully seated. Observe 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 machine.

  6. Determine if the CID 2146 FMI 02 diagnostic code is active.

Expected Result:

The CID 2146 FMI 02 diagnostic code is not active.

Results:

  • OK. - The CID 2146 FMI 02 diagnostic code is not active. The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor connection or a short at one of the connectors that was disconnected and reconnected. Resume normal operation.

    STOP

  • NOT OK. - The CID 2146 FMI 02 diagnostic code is active. The diagnostic code has not been corrected.

    Repair: Check the circuit again. Use the Caterpillar Electronic Technician (ET) service tool, if available, in order to perform a wiggle test on the machine wiring harness. The wiggle test can detect momentary or intermittent shorts or opens in the machine wiring harness.

    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 of your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time.

    If the ECM must be replaced, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

    STOP

Caterpillar Information System:

14L Motor Grader Implement Electronic Control System MID 082 - CID 2143 - FMI 09
14L Motor Grader Implement Electronic Control System MID 082 - CID 2113 - FMI 04
14L Motor Grader Implement Electronic Control System MID 082 - CID 2113 - FMI 03
990K Wheel Loader Systems Pump Control Valve
14L Motor Grader Implement Electronic Control System MID 082 - CID 1558 - FMI 09
14L Motor Grader Implement Electronic Control System MID 082 - CID 1482 - FMI 04
14L Motor Grader Implement Electronic Control System MID 082 - CID 1482 - FMI 03
14L Motor Grader Implement Electronic Control System MID 082 - CID 1473 - FMI 14
14L Motor Grader Implement Electronic Control System MID 082 - CID 1473 - FMI 08
14L Motor Grader Implement Electronic Control System MID 082 - CID 1473 - FMI 04
14L Motor Grader Implement Electronic Control System MID 082 - CID 1473 - FMI 03
14L Motor Grader Implement Electronic Control System MID 082 - CID 1473 - FMI 02
14L Motor Grader Implement Electronic Control System MID 082 - CID 2146 - FMI 03
14L Motor Grader Implement Electronic Control System MID 082 - CID 2146 - FMI 04
14L Motor Grader Implement Electronic Control System MID 082 - CID 2146 - FMI 08
Improved Camshafts, Rocker Arm Assemblies, and High-Pressure Oil Pumps Are Now Used on C27 and C32 Machine Engines {1123, 1210, 1304, 1315} Improved Camshafts, Rocker Arm Assemblies, and High-Pressure Oil Pumps Are Now Used on C27 and C32 Machine Engines {1123, 1210, 1304, 1315}
14L Motor Grader Implement Electronic Control System MID 082 - CID 2147 - FMI 03
14L Motor Grader Implement Electronic Control System MID 082 - CID 2147 - FMI 04
14L Motor Grader Implement Electronic Control System MID 082 - CID 2150 - FMI 03
725C2, 730C2 Articulated Truck LRC Engine Supplement Alternator - Remove and Install
725 C2 Articulated Truck LRC Engine Supplement Battery - Remove and Install
14L Motor Grader Implement Electronic Control System MID 082 - CID 2150 - FMI 04
14L Motor Grader Implement Electronic Control System MID 082 - CID 2150 - FMI 08
14L Motor Grader Implement Electronic Control System MID 082 - CID 2151 - FMI 03
Back to top
The names Caterpillar, John Deere, JD, JCB, Hyundai or any other original equipment manufacturers are registered trademarks of the respective original equipment manufacturers. All names, descriptions, numbers and symbols are used for reference purposes only.
CH-Part.com is in no way associated with any of the manufacturers we have listed. All manufacturer's names and descriptions are for reference only.