24M Motor Grader Power Train Electronic Control System MID 027 - CID 1473 - FMI 14 Caterpillar


MID 027 - CID 1473 - FMI 14
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MID 027 CID 1473 FMI 14

Conditions Which Generate This Code:



Illustration 1g01291021
Left Joystick Steering Position Sensors connections

Three steering sensors are required for correct operation of the steering control. The steering sensors are located in the left joystick assembly. Each sensor provides an input signal to the Implement ECM and to the Transmission/Chassis ECM. The ECM expects the input signals from all three steering sensors to match very closely. The FMI 14 diagnostic code is active when the ECM determines that the PWM input signal from the steering position sensor 3 does not match the PWM input signal from one of the other steering sensors.

The steering position sensor 3 receives power from the 8 volt power supply of the Transmission/Chassis ECM. The steering sensor 3 is connected to ground at the 5 volt sensor return of the Transmission/Chassis ECM. The steering sensor must lose the 8 volt power supply or both grounds in order to lose power. The illustration above indicates the power and ground connections for steer position sensor 3.

The position sensor is a PWM sensor that operates at a frequency of approximately 500 ± 80 hertz. The position sensor sends a PWM input signal to the Implement ECM and to the Transmission/Chassis ECM. The duty cycle of the signal will vary from approximately 10% at the lever full left position to approximately 90% at the lever full right position. When the lever is in the center position, the duty cycle will be approximately 50%.

The possible causes of this diagnostic code are listed below:

  • The sensor has failed.

  • The ECM has failed. This is unlikely.

Note: Before performing this procedure, check for an active MID 027 CID 0041 diagnostic code for the Transmission/Chassis ECM 8 volt sensor power supply. Correct any problem with the 8 volt power supply before performing this procedure.

Note: The correct operating temperature range for the steering sensors is −40 °C (−40.0 °F) to 75 °C (167.0 °F). If an FMI 03, an FMI 08 or possibly an FMI 14 diagnostic code becomes active for a steering sensor when the cab environment is at extreme temperatures, standardize the cab environment in order to keep the steering sensors operating at the acceptable temperature range. After the standardization of the temperature, verify that the CID 1473 FMI 14 diagnostic code is active before performing this procedure.

Note: The Transmission/Chassis ECM (MID 027) and the Implement ECM (MID 082) receive an input signal from the steering sensor 3. Both ECM's can activate a CID 1473 FMI 14 diagnostic code when the signal is erratic or intermittent. If one ECM has activated a CID 1473 FMI 14 diagnostic code and the other ECM has not, it is likely that the sensor is operating correctly. When this occurs, a poor connection in the machine harness would be suspected. When both ECM's have activated the diagnostic code, either the sensor or a harness problem could be the cause. If both ECM's have activated the diagnostic code, it is very unlikely that either ECM is causing the problem. For either condition, proceed with this procedure in order to verify the cause of the problem.

Note: The Transmission/Chassis ECM (MID 027) and the Implement ECM (MID 082) receive an input signal from the steering sensor 3. Both ECM's can activate a CID 1473 FMI 14 diagnostic code when the signal from one steering sensor does not closely match the signal from one of the other steering sensors and does match the signal from the third steer sensor. If one ECM has activated a CID 1473 FMI 14 diagnostic code and the other ECM has not, it is likely that the sensor is operating correctly. When this occurs, a poor connection in the machine harness would be suspected. When both ECM's have activated the diagnostic code, either the sensor OR a harness problem could be the cause. If both ECM's have activated the diagnostic code, it is very unlikely that either ECM is causing the problem. For either condition, proceed with this procedure in order to verify the cause of the problem.

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. 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.

Note: The next three test steps will measure the duty cycle of each steering sensor in order to determine if one signal is not closely matching with both of the other sensor signals. Record the duty cycle of the sensor signal for each of the three sensors for comparison.

Test Step 1. CHECK THE SIGNAL AT STEER SENSOR 1

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

  2. Do not disconnect the harness connector from the sensor.

  3. At the machine harness connector J1 for the left joystick, use a 151-6320 Removal Tool to remove the steer sensor 1 signal wire (wire U739-BR(Brown)) and the socket at contact J1-2. The machine harness connector J1 remains connected to the connector of the left joystick.

  4. At the back of the joystick connector J1, insert 7X-1710 Multimeter Probes along the sensor signal contact J1-2 and the return contact at J1-4.

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

  6. Monitor the signal of the sensor with a digital multimeter.

  7. Move the joystick through the full range of operation. Record the duty cycle of the sensor to specific joystick positions.

Expected Result:

The duty cycle of the steer sensor 1 has been noted at specific positions of the joystick.

Results:

  • OK - The duty cycle has been recorded for comparison with the other two steering sensors. Reconnect the signal wire and the socket in the machine harness connector for the joystick before proceeding to the next test step. Proceed to Test Step 2.

Test Step 2. CHECK THE SIGNAL AT SENSOR 2

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

  1. At the machine harness connector J1 for the left joystick, use a 151-6320 Removal Tool to remove the steer sensor 2 signal wire U740-BU(Blue) and the socket at contact J1-7 from the harness connector. The machine harness connector J1 remains connected to the left joystick connector.

  2. At the back of the joystick connector J1, insert 7X-1710 Multimeter Probes along the sensor signal contact J1-7 and the return contact at J1-8.

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

  4. Monitor the signal of the sensor with a digital multimeter.

  5. Move the joystick through the full range of operation. Record the duty cycle of the sensor at specific positions of the joystick.

Expected Result:

The duty cycle of the steering sensor 2 has been noted at specific positions of the joystick.

Results:

  • OK - The duty cycle has been recorded for comparison with the other two steering sensors. Reconnect the signal wire and the socket in the machine harness connector for the joystick before proceeding to the next test step. Proceed to Test Step 3.

Test Step 3. CHECK THE SIGNAL AT STEER SENSOR 3

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

  1. At the machine harness connector J3 for the left joystick, use a 151-6320 Removal Tool to remove the steering sensor 3 signal wire U741-OR(Orange) and the socket at contact J3-1 from the harness connector. The machine harness connector J3 remains connected to the connector of the left joystick.

  2. At the back of the joystick connectors J1 and J3, insert 7X-1710 Multimeter Probes along the sensor signal contact J3-1 and the return contact at J3-3.

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

  4. Monitor the signal of the sensor with a digital multimeter.

  5. Move the joystick through the full range of operation. Record the duty cycle of the sensor at specific positions of the joystick.

Expected Result:

After comparison of the duty cycles of all three steering sensors at the same specific positions of the joystick, each duty cycle of the sensor signal is within 5% or less of the signals from the other sensors.

Results:

  • OK - There is a 5% or less deviation between the PWM duty cycle signals for the three steer sensors with the joystick in the same position. Proceed to Test Step 4.

  • NOT OK - When the joystick is the same position, one or more of the PWM duty cycle signals deviates more than 5% when compared to the signals from the other two steering sensors. There is a problem with a steering sensor.

    Repair: One of the steering sensors is not operating correctly. Replace the assembly of the left joystick. After replacement of the joystick assembly, verify that the new assembly is working correctly before operating the machine.

    STOP

Test Step 4. 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. Operate the machine.

  5. Check the status of the CID 1473 FMI 14 diagnostic code.

Expected Result:

The CID 1473 FMI 14 diagnostic code is not active.

Results:

  • OK - The CID 1473 FMI 14 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 1473 FMI 14 diagnostic code is active. The diagnostic code has not been corrected.

    Repair: If the cause of the active diagnostic code is not found, the ECM that has activated this diagnostic code may have failed.

    If both the Transmission/Chassis ECM and the Implement ECM have activated this diagnostic code, it is very unlikely that either ECM is causing the problem.

    Exit this procedure and perform this procedure again. If the cause of the failure is not found, contact your dealership's Technical Communicator for possible consultation with AVSpare. This consultation may greatly reduce repair time.

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

    STOP

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