D3K2, D4K2 and D5K2 Track-Type Tractors Systems Sensor Signal (PWM) - Test Caterpillar


Sensor Signal (PWM) - Test
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The following is a list of diagnostic codes that are associated with the PWM Sensors of the machine.

Table 1
Diagnostic Trouble Codes (DTC)    
MID     DTC     Description    
39     148-3     Hystat Drive Pressure Sensor: Voltage Above Normal    
39     148-4     Hystat Drive Pressure Sensor: Voltage Below Normal    
39     148-13     Hystat Drive Pressure Sensor: Calibration Required    
39     1078-3     Blade Control Handle Raise/Lower Position Sensor: Voltage Above Normal    
39     1078-4     Blade Control Handle Raise/Lower Position Sensor: Voltage Below Normal    
39     1078-8     Blade Control Handle Raise/Lower Position Sensor: Abnormal Frequency, Pulse Width, or Period    
39     1078-13     Blade Control Handle Raise/Lower Position Sensor: Calibration Required    
39     1079-3     Blade Control Handle Tilt Position Sensor: Voltage Above Normal    
39     1079-4     Blade Control Handle Tilt Position Sensor: Voltage Below Normal    
39     1079-8     Blade Control Handle Tilt Position Sensor: Abnormal Frequency, Pulse Width, or Period    
39     1079-13     Blade Control Handle Tilt Position Sensor: Calibration Required    
39     1699-3     Joystick Forward/Reverse Position Sensor: Voltage Above Normal    
39     1699-4     Joystick Forward/Reverse Position Sensor: Voltage Below Normal    
39     1699-8     Joystick Forward/Reverse Position Sensor: Abnormal Frequency, Pulse Width, or Period    
39     1699-13     Joystick Forward/Reverse Position Sensor: Calibration Required    
39     1700-3     Joystick Left/Right Position Sensor: Voltage Above Normal    
39     1700-4     Joystick Left/Right Position Sensor: Voltage Below Normal    
39     1700-8     Joystick Left/Right Position Sensor: Abnormal Frequency, Pulse Width, or Period    
39     1700-13     Joystick Left/Right Position Sensor: Calibration Required    
39     1870-3     Blade Control Handle Thumb Rocker Position Sensor: Voltage Above Normal    
39     1870-4     Blade Control Handle Thumb Rocker Position Sensor: Voltage Below Normal    
39     1870-8     Blade Control Handle Thumb Rocker Position Sensor: Abnormal Frequency, Pulse Width, or Period    
39     1870-13     Blade Control Handle Thumb Rocker Position Sensor: Calibration Required    
39     1976-3     Right Travel Forward Pressure Sensor: Voltage Above Normal    
39     1976-4     Right Travel Forward Pressure Sensor: Voltage Below Normal    
39     1976-8     Right Travel Forward Pressure Sensor: Abnormal Frequency, Pulse Width, or Period    
39     1977-3     Right Travel Backward Pressure Sensor: Voltage Above Normal    
39     1977-4     Right Travel Backward Pressure Sensor: Voltage Below Normal    
39     1977-8     Right Travel Backward Pressure Sensor: Abnormal Frequency, Pulse Width, or Period    
39     1978-3     Left Travel Forward Pressure Sensor: Voltage Above Normal    
39     1978-4     Left Travel Forward Pressure Sensor: Voltage Below Normal    
39     1978-8     Left Travel Forward Pressure Sensor: Abnormal Frequency, Pulse Width, or Period    
39     1979-3     Left Travel Backward Pressure Sensor: Voltage Above Normal    
39     1979-4     Left Travel Backward Pressure Sensor: Voltage Below Normal    
39     1979-8     Left Travel Backward Pressure Sensor: Abnormal Frequency, Pulse Width, or Period    
39     2204-3     Auxiliary Lever #1 Position Sensor: Voltage Above Normal    
39     2204-4     Auxiliary Lever #1 Position Sensor: Voltage Below Normal    
39     2204-8     Auxiliary Lever #1 Position Sensor: Abnormal Frequency, Pulse Width, or Period    
39     2204-13     Auxiliary Lever #1 Position Sensor: Calibration Required    
39     2305-3     Brake/Decelerator Pedal Position Sensor: Voltage Above Normal    
39     2305-4     Brake/Decelerator Pedal Position Sensor: Voltage Below Normal    
39     2305-8     Brake/Decelerator Pedal Position Sensor: Abnormal Frequency, Pulse Width, or Period    
39     2305-13     Brake/Decelerator Pedal Position Sensor: Calibration Required    
39     2500-3     Power train Speed Range Control Position Sensor: Voltage Above Normal    
39     2500-4     Power train Speed Range Control Position Sensor: Voltage Below Normal    
39     2500-8     Power train Speed Range Control Position Sensor: Abnormal Frequency, Pulse Width, or Period    
39     2685-2     Left Drive Motor Speed Sensor #1: Data Erratic, Intermittent, or Incorrect (1)    
39     2685-8     Left Drive Motor Speed Sensor #1: Abnormal Frequency, Pulse Width, or Period    
39     2686-2     Left Drive Motor Speed Sensor #2: Data Erratic, Intermittent, or Incorrect (1)    
39     2686-8     Left Drive Motor Speed Sensor #2: Abnormal Frequency, Pulse Width, or Period    
39     2687-2     Right Drive Motor Speed Sensor #1: Data Erratic, Intermittent, or Incorrect (1)    
39     2687-8     Right Drive Motor Speed Sensor #1: Abnormal Frequency, Pulse Width, or Period    
39     2688-2     Right Drive Motor Speed Sensor #2: Data Erratic, Intermittent, or Incorrect (1)    
39     2688-8     Right Drive Motor Speed Sensor #2: Abnormal Frequency, Pulse Width, or Period    
39     4328-3     Bi-Directional Auto Shift Selector Dial voltage above normal.    
39     4328-4     Bi-Directional Auto Shift Selector Dial voltage below normal.    
39     4328-8     Bi-Directional Auto Shift Selector Dial Abnormal Frequency, Pulse Width, or Period.    
39     4329-3     Winch Spool in Pressure Sensor : Voltage Above Normal.    
39     4329-4     Winch Spool in Pressure Sensor : Voltage Below Normal.    
39     4329-8     Winch Spool in Pressure Sensor : Abnormal Frequency, Pulse Width or Period.    
39     4330-3     Winch Spool Out Pressure Sensor : Voltage Above Normal.    
39     4330-4     Winch Spool Out Pressure Sensor : Voltage Below Normal.    
39     4330-8     Winch Spool Out Pressure Sensor : Abnormal Frequency, Pulse Width or Period.    
( 1 ) The machine may be placed on jack stands when performing the test steps for this diagnostic code.

Pulse Width Modulation (PWM) is a technique for controlling analog circuits with digital outputs. PWM is employed in various applications ranging from measurement to communication with the Electronic Control Module (ECM). The duty cycle of a square wave is modulated to encode a specific analog signal level. The duty cycle is the ratio of the on-time to the period. The modulating frequency is the inverse of the period. The duty cycle is programmed into the software of the ECU. The engineer (or programmer) sets the period in the on-chip timer counter that provides the modulating square wave. The engineer sets the direction of the PWM output along with the on-time in the PWM control register.

One of the advantages of the PWM sensor is that the signal remains digital all the way from the ECM to the controlled system. No digital to analog conversion is necessary. By using a digital signal, noise effects are minimized. Noise affects a digital signal if the noise can change a logic 1 to a logic 0 or a logic 0 to a logic 1.

Possible Causes for an FMI 2 Diagnostic code are:

  • The sensor has failed.

  • Intermittent connections or poor connections.

  • Mechanical devices are loose.

  • The Machine ECM has failed. A failure of the ECM is unlikely.

Possible Causes for an FMI 3 Diagnostic code are:

  • The sensor supply or the ground circuit in the machine harness is open.

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

  • The signal circuit in the machine harness is open or the sensor is disconnected.

  • The sensor has failed.

  • The Machine ECM has failed. A failure of the ECM is unlikely.

Possible Causes for an FMI 4 Diagnostic code are:

  • The sensor has failed.

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

  • The Machine ECM has failed. A failure of the ECM is unlikely.

Possible Causes for an FMI 8 Diagnostic code are:

  • The sensor has failed.

  • Intermittent connections or poor connections.

Possible Causes for an FMI 13 Diagnostic code are:

  • The ECM detects the signal from the sensor as being out of calibration.

Note: Prior to beginning this procedure, use Cat ET or the machine monitors to check for an active DTC that indicates a failure of a power supply on the ECM. If the code is present, refer to the Sensor Supply - Test story to correct this problem before continuing.

Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure.

Note: Some test procedures may create additional diagnostic codes. Ignore these created diagnostic codes and clear the codes when the original diagnostic code has been corrected.




Illustration 1g03713040

ECM PWM Sensors

Note: The diagram above is simplified schematic of the Machine ECM connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, UENR4092 for the complete schematic.

Table 2
Troubleshooting Test Steps     Values     Results    
1. Identify Active FMI Code Associated With Sensor Circuit    
Code present    
FMI 2 diagnostic code, proceed to Test Step 2.

FMI 3diagnostic code, proceed to Test Step 8.

FMI 4 diagnostic code, proceed to Test Step 12.

FMI 8 diagnostic code, proceed to Test Step 15.

FMI 13 diagnostic code, proceed to Test Step 23.    
2. Clearing The Diagnostic Code Procedure

A. 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, secure, and are in good condition.

B. Turn the disconnect switch and key switch to the ON position and start the machine. Go to high idle.

C. Connect to ET and verify that the diagnostic code is still active.

D. Set the Machine Speed to 0.1 on CIC.

E. Move the tracks to determine if the ECM detects a good signal from the sensors.

F. Monitor the motor speed and motor direction parameters from the ET status screen.

G. Place the FNR switch in the FORWARD position.

H. In ET, check to see if the speed and direction parameters are non-zero and the diagnostic code has been cleared.    

Speed and direction values are non-zero and the Diagnostic code has been cleared    
OK - The speed and direction of the track are non-zero and the diagnostic code has been cleared.

Repair - Stop the machine and shut down. The problem is most likely due to an intermittent open circuit in the machine harness. Check the connection and harness. Repair the harness or replace the harness. Repeat this test after the repair is completed.

STOP

NOT OK- The tracks have moved and the diagnostic code is still active.

Proceed to Test Step 3.    
3. Check For Power At The Sensor

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

B. At the back of the harness connector for the sensor, insert a multimeter probe along contact 1 for the voltage supply..

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

D. Measure voltage between contact 1 and contact 2    

Voltage is 8.0 ± 0.5 VDC    
OK - The voltage reading is correct for the suspected faulty sensor.

Proceed to Test Step 4.

STOP

NOT OK- The voltage is NOT correct for the circuit.

Repair - Repair the machine harness or replace the machine harness and check to see if the diagnostic is cleared according to Test Step 2.    
4. Check For An Open On The Signal Circuits

A. Turn key start switch and disconnect switch OFF.

B. Disconnect the machine harness from sensor. and place a jumper between pins 3 and 4.

C. Disconnect the machine harness from the ECM and measure the resistance between the two related signal circuits.    

The resistance between the two pins is less than 5 Ω.    
OK - The resistance between pins 3 and 4 is less than 5 Ω.

Proceed to Test Step 5.

NOT OK- The voltage is NOT correct for the circuit. There is an open circuit in one of the two related signal wires on the machine harness.

Repair - Repair the machine harness or replace the machine harness. After the repair, return to Test Step 2 to check if the diagnostic code is cleared.    
5. Check For A Short On The Signal Circuits

A. Turn key start switch and disconnect switch OFF.

B. Remove the jumper wire from the previous test step.

C. Check the resistance between the related signal wire and every other pin on the J1 and J2 connectors.    

The resistance is greater than 5k Ω.    
OK - The resistance measurements are all greater than 5k Ω.

Proceed to Test Step 6.

NOT OK- The voltage is less than 5k Ω. There is a short on the harness wire with the low resistance measurement. The machine harness has failed.

Repair - Repair or replace the machine harness. After the repair, return to Test Step 2 to check if the diagnostic code is cleared.    
6. Check The Signal Circuit For A Short In The Harness

A. Turn key start switch and disconnect switch OFF.

B. Disconnect the machine harness connectors from the sensor and the ECM.

C. Measure the resistance between the related signal wire and all other contacts that are used in the machine harness connectors for the ECM.    

The resistance is greater than 5k Ω.    
OK - The resistance measurements are all greater than 5k Ω.

Proceed to Test Step 7.

NOT OK- The voltage is less than 5k Ω. There is a short on the harness wire with the low resistance measurement. The machine harness has failed.

Repair - Repair or replace the machine harness. After the repair, return to Test Step 2 to check if the diagnostic code is cleared.    
7. Check If The Diagnostic Code Remains

A. Inspect the harness connectors and clean the contacts of the harness connectors and check the wires for damage to the insulation that is caused by excessive heat, corrosion, or chafing.

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

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

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

E. Check to see if the diagnostic code is cleared by following the steps in Test Step 2.

F. Check the status of the diagnostic code.    

The diagnostic code is not active.    
OK - The diagnostic code is not active. The initial diagnostic code was most likely caused by a poor connection or a short at one of the connectors that was disconnected and reconnected. Resume normal operations.

STOP

NOT OK- The diagnostic code is active. The sensor may have failed.

Repair - Replace the related sensor. If the cause of the problem is not found, then recheck the circuit and perform this procedure again. If the diagnostic code is still active, the Machine ECM may require replacement.


Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may greatly reduce repair time.

Follow the procedure in Testing and Adjusting, "ECM - Replace" to replace the ECM.

STOP    
Begin Process For FMI 3 Troubleshooting HERE    
8. Check The Control And The Harness

A. Turn key start switch and disconnect switch ON.

B. Disconnect the machine harness from sensor.

C. Refer to the schematic to determine the voltage source for the suspected faulty sensor.

D. Measure voltage between signal and ground contacts at the machine harness connector for the sensor.    

Voltage is 5.0 ± 0.5 VDC, 8.0 ± 0.5 VDC, or 10.0 VDC ± 0.5.    
OK - The voltage reading is correct for the suspected faulty sensor.

Proceed to Test Step 9.


NOT OK- The voltage is NOT correct for the circuit.

Repair - There may be an open or short in the machine harness. The open or short will be on the power or ground circuit wires. Repair or replace the machine harness.    
9. Check For An Open In The Sensor Circuit

A. The sensor remains disconnected from the machine harness.

B. Turn the key start switch and the disconnect switch OFF.

C. At the harness connector for the sensor, place a jumper wire between the ground contact and the signal contact.

D. Disconnect J1 and J2 harness connectors from the ECM.

E. At machine harness connector for sensor, measure the resistance from the signal contact to return contact.

F. Gently pull on the wires and move the wires in a circular motion at ECM connector and observe the resistance readings. Repeat the process for the sensor connector.    

The resistance is less than 5 Ω at all times during the manipulation of the harness..    
OK - The resistance is less than 5 Ω. The signal circuit and the ground circuits of the sensor are not open in the machine harness.

Proceed to Test Step 10.

NOT OK - Resistance reading for the signal circuit or the return circuit is greater than 5 Ω.

Repair: Check the signal circuit or the ground circuit for opens or bad connections.

Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.

STOP    
10. Check Signal Circuit For A Short To +Battery

A. The Sensor and the ECM are disconnected from the harness.

B. Turn the disconnect switch and the key start switch OFF.

C. Measure the resistance between the signal and +battery contacts of the harness connector for the sensor.

D. At machine harness connector J1 and J2 measure the resistance from signal contact to all possible sources of +battery.    

Resistance greater than 5K Ω for all readings.    
OK - The resistance is greater than 5K Ω. The harness circuit is correct..

Proceed to Test Step11.

NOT OK- The resistance less than 5 Ω.

Repair: A short exists in the harness between the +battery and signal circuit. Repair or replace the machine harness.

Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.

STOP    
11. Check The Harness For A Short

A. The disconnect switch and key start switch are OFF

B. The sensor and ECM disconnected from harness.

C. Measure the resistance from the signal wire to all other J1 and J2 contacts.    

Resistance greater than 5K Ω for all readings.    
OK - The resistance is greater than 5K Ω. The harness circuit is correct..

Repair: A short exists in the harness between the signal circuit and the circuit with the lower resistance measurement. Repair or replace the machine harness.
Proceed to Test Step 22.

NOT OK- The resistance less than 5 Ω.

Repair: A short exists in the harness between the signal circuit and the circuit with the lower resistance measurement. Repair or replace the machine harness.

Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.

STOP    
Begin Process For FMI 4 Troubleshooting HERE    
12. Check The Control And The Harness

A. Turn key start switch and disconnect switch ON.

B. Disconnect the machine harness from sensor.

C. Refer to the schematic to determine the voltage source for the suspected faulty sensor.

D. Measure voltage between signal and ground contacts at the machine harness connector for the sensor.    

Voltage is 5.0 ± 0.5 VDC, 8.0 ± 0.5 VDC, or 10.0 VDC ± 0.5.    
OK - The voltage reading is correct for the suspected faulty sensor.

Proceed to Test Step 13.


NOT OK- The voltage is NOT correct for the circuit.

Repair - There may be an open or short in the machine harness. The open or short will be on the power or ground circuit wires. Repair or replace the machine harness.    
13. Check The Sensor

A. With FMI 4 active, disconnect the sensor from the machine harness.

B. Observe Cat ET or the operator monitor for code change as the sensor is disconnected and connected to harness.    

Code changes from FMI 4 to FMI 3.    
OK - The diagnostic changed to FMI 3 when the sensor was disconnected.

Repair: Replace the sensor.

STOP

NOT OK - The FMI 4 diagnostic code remains active when sensor is disconnected. The sensor not the cause of the problem.

Proceed to Test Step 14.    
14. Check The Signal Circuit For A Short To Ground

A. Turn the key start switch and the disconnect switch OFF.

B. Disconnect the J1 harness connector from the ECM.

C. Measure the resistance between the signal contact for sensor and frame ground.    

The resistance is greater than 5K Ω.    
OK - The resistance is greater than 5K Ω. The harness circuit is correct.

Proceed to Test Step 22.

NOT OK - The resistance is less than 5 Ω. A short circuit exists between frame ground and the signal circuit.

Repair: Repair or replace the machine harness.

Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.

STOP    
Begin Process For FMI 8 Troubleshooting HERE    
15. Check The Control And The Harness

A. Turn key start switch and disconnect switch ON.

B. Disconnect the machine harness from sensor.

C. Refer to the schematic to determine the voltage source for the suspected faulty sensor.

D. Measure voltage between signal and ground contacts at the machine harness connector for the sensor.    

Voltage is 5.0 ± 0.5 VDC, 8.0 ± 0.5 VDC, or 10.0 VDC ± 0.5.    
OK - The voltage reading is correct for the suspected faulty sensor.

Proceed to Test Step 16.


NOT OK- The voltage is NOT correct for the circuit.

Repair - There may be an open or short in the machine harness. The open or short will be on the power or ground circuit wires. Repair or replace the machine harness.    
16. Check Harness For An Open

A. Turn the disconnect switch and the key start switch OFF

B. The sensor and ECM are disconnected from the harness.

C. Connect a jumper wire from the end of signal wire at the ECM to a known ground.

D. Measure the resistance of the signal wire at ECM.    

The reading is less than 5 Ω.    
OK - The measurement is less than 5 Ω.

Proceed to Test Step 17.

NOT OK - The measurement is greater than 5K Ω. The signal circuit in the harness is open.

Repair: Repair or replace the machine harness.

Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.

STOP    
17. Check The Signal Circuit For A Short To Ground

A. Turn key start switch and disconnect switch OFF.

B. Disconnect J1 harness connector from ECM.

C. Measure resistance between signal contact for sensor and frame ground.    

Reading is greater than 5K Ω.    
OK - Measurement is greater than 5K Ω.

Proceed to Test Step 10.

NOT OK - Measurement is less than 5 Ω. The signal circuit in the harness is shorted to ground.

Repair: Repair or replace the machine harness.

Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.

STOP    
18. Check The Sensor For A Short To Case

A. Turn the key start switch and the disconnect switch OFF.

B. At the machine harness connector for the sensor, measure the resistance between each pin of sensor and an unpainted location on case of sensor.    

The reading is greater than 5K Ω.    
OK - All measurements are greater than 5K Ω.

Proceed to Test Step 11.

NOT OK - A measurement is less than 5 Ω. The sensor has failed..

Repair: Replace the sensor. Confirm that the new sensor corrects the problem.

Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.

STOP    
19. Check The Sensor For A Short To +Battery

A. Disconnect the machine harness at the sensor.

B. Turn the key start switch and the disconnect switch ON.

C. At machine harness connector for J1 connector, measure the voltage between the signal pin of sensor and frame ground.    

The voltage is 0 VDC.    
OK - Voltage is 0 VDC.

Proceed to Test Step 12.

NOT OK - Significant voltage is present in circuit.

Repair: Repair or replace the machine harness.

STOP    
20. Check The Harness For A Short To +Battery

A. Turn the key start switch and the disconnect switch ON.

B. At machine harness connector for sensor, measure the voltage between each pin of sensor and frame ground (contacts 1, 2, and 3).    

The voltage is 0 VDC.    
OK - Voltage is 0 VDC.

Proceed to Test Step 13.

NOT OK - Significant voltage is present in circuit. Circuit shorted to +battery.

Repair: Replace the sensor. Verify that the new sensor corrected the diagnostic code.

STOP    
21. Check The Sensor

A. Turn the key start switch and the disconnect switch ON.

B. Use Cat ET or the operator monitor to confirm the existence of the diagnostic code.

C. Disconnect the sensor from machine harness.    

The diagnostic code is no longer present.    
OK - Diagnostic code is NO longer active. The sensor has failed.

Repair: Replace the sensor. Verify new sensor corrected the diagnostic code.

STOP

NOT OK - The diagnostic code remains active.

Proceed to Test Step 22.    
22. Check If The Diagnostic Code Remains.

A. Turn the key start switch and the disconnect switch ON.

B. Clear all diagnostic codes.

C. Operate the machine.

D. Stop machine and engage the safety lock lever.

E. Check if the diagnostic code for the sensor is active.    

The code for the sensor is NO longer present.    
OK - The diagnostic code does not exist at this time. The initial diagnostic code may have been caused by a poor electrical connection or a short at one of the harness connections. Resume machine operation.

STOP

NOT OK - The diagnostic trouble code has not been corrected.

Repair: Recheck the circuit and perform this procedure again. If the diagnostic code is still active, replace the sensor. If replacing the sensor does not correct the problem, the Machine ECM may require replacement.

Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may greatly reduce repair time.

Follow the procedure in Testing and Adjusting, "ECM - Replace" to replace the ECM.

STOP    
Begin Process For FMI 13 Troubleshooting HERE    
23. Calibrate The Solenoid

A. Perform the calibration procedure for the sensor. See Testing and Adjusting, UENR4089 for instructions on calibrating the relevant sensor.    

The calibration procedure for the solenoid was performed successfully.    
OK - The calibration procedure for the solenoid was performed successfully. Resume normal machine operation.

STOP

NOT OK - The calibration procedure was performed successfully.

Repair: Repeat the calibration procedure for the solenoid. See Testing and Adjusting, UENR4089 for instructions on calibrating the relevant sensor.

STOP    

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