D3K2, D4K2 and D5K2 Track-Type Tractors Systems Sensor Supply

Sensor Supply - Test

D3K2, D4K2 and D5K2 Track-Type Tractors Systems [UENR5465]

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ELECTRICAL AND STARTING SYSTEM

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D3K2, D4K2 and D5K2 Track-Type Tractors Systems Sensor Supply - Test

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Table 1
MID	DTC	Description
39	41-3	8 VDC Supply
39	41-4	8 VDC Supply
39	262-3	5 VDC Supply
39	262-4	5 VDC Supply

Possible causes of an FMI 03 Diagnostic code are:

The sensor supply output is shorted to a higher voltage supply.
The Machine ECM may have failed. This situation is unlikely.

Possible causes of an FMI 04 Diagnostic code are:

A sensor has failed.
The sensor supply output is shorted to a lower voltage or ground source
The Machine ECM may have failed. This situation is unlikely.

Note: Poor harness connections are often the cause of a problem in electrical circuits. Before performing this procedure, inspect all of the connectors involved in the circuit. Verify that all of the connections in the circuit are dry, clean, secure, and in good condition. Each pin and socket in the connectors should mate correctly when the connectors are fastened together. Check for exposed wires at the connectors for nicks or abrasion. If a problem is found with any of the connections: correct the problem and verify that diagnostic code is still active, before performing the following procedures.

Perform a wiggle test on the sensor circuit of the machine wiring harness, using Cat ET. The wiggle test can be used to detect open or shorted connections in the machine wiring harness. Reconnect all harness connectors. Make sure that the connectors are fully seated. Observe that the clips for each connector are fastened.

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Illustration 1	g03714879
Schematic of the sensor supply voltage circuits

Note: The diagram above is a 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.

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Table 2
Troubleshooting Test Steps	Values	Results
1. Identify Active FMI Code Associated With The Sensor Supply Circuit	Code present	FMI 3diagnostic code, proceed to Test Step 2. FMI 4 diagnostic code, proceed to Test Step 6.
2. Check The Sensor Supply Voltage At The Sensors A. Turn the key start switch and the disconnect switch ON. B. Disconnect the machine harness connector from the sensors. C. At the machine harness connector for the sensors, measure the voltage between the voltage supply contact and the voltage return contact.	Voltage is 5.0 ± 0.5 VDC, 8.0 ± 0.5 VDC, or 10.0 VDC ± 0.5.	OK - The voltage is appropriate for the circuit as determined by the schematic. Verify that the diagnostic code is present. If the code is still active, go to Test Step 4. STOP NOT OK - The reading is NOT the appropriate voltage as determined by the schematic. The voltage is greater than the expected voltage for the circuit based on the schematic. The sensor supply voltage is NOT correct. Proceed to Test Step 3.
3. Check The Power Supply At The ECM A. Turn the key start switch and the disconnect switch OFF. B. Remove the voltage supply and return wires from the ECM harness for the related supply circuit. C. At the contacts for the related voltage supply and return circuit, measure the voltage.	Voltage is 5.0 ± 0.5 VDC, 8.0 ± 0.5 VDC, or 10.0 VDC ± 0.5.	OK - The voltage is appropriate for the circuit as determined by the schematic. Install the voltage supply and return wires back in to the harness. Proceed to Test Step 4. NOT OK - The voltage measurement is not correct. The ECM power supply is not correct. 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. Refer to Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP
4. Check For A Short Circuit In The Machine Harness A. Turn the key start switch and the disconnect switch OFF. B. Disconnect the sensors from the machine harness one at a time. Disconnect the machine harness connectors from the ECM C. Measure the resistance from the voltage supply wire to all other contacts in the harness.	The resistance measurements are greater than 5K Ω,	OK - The resistance is greater than 5K Ω. The harness circuit resistance is correct. Proceed to Test Step 5. NOT OK - Resistance is less than 5 Ω. The supply wire is shorted to whichever resistance measurements which were low. Repair: Repair or replace the machine harness. Confirm that the harness repair or replacement has corrected the problem. If the diagnostic code is present after harness repair or replacement, replacement of the ECM may be necessary. 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.
5. Check If The Diagnostic Code Remains A. Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation. B. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit. C. Reconnect all harness connectors in order to make sure that the connectors are fully seated. Also, make sure that the clips for each connector are completely fastened. D. Turn the disconnect switch and the key start switch to the ON position. E. Operate the machine. F. Check the status of the diagnostic code.	The diagnostic code is no longer active.	OK - The diagnostic code is not active. The initial diagnostic code was probably caused by a poor electrical connection at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation. STOP NOT OK - The diagnostic code is active. The diagnostic code has not been corrected. Repair: Check the circuit again. ECM failure is unlikely. Perform the Test Step procedure again. If the diagnostic code continues to remain active, ECM replacement may be required. 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. Refer to Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP
Begin Process For FMI 4 Troubleshooting HERE
6. Check The Power Supply At The ECM A. Turn the key start switch and the disconnect switch OFF. B. Remove the voltage supply and return wires from the ECM harness for the related supply circuit. C. At the contacts for the related voltage supply and return circuit, measure the voltage.	Voltage is 5.0 ± 0.5 VDC, 8.0 ± 0.5 VDC, or 10.0 VDC ± 0.5.	OK - The voltage is appropriate for the circuit as determined by the schematic. Install the voltage supply and return wires back in to the harness. Proceed to Test Step 7. NOT OK - The voltage measurement is not correct. The ECM power supply is not correct. 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. Refer to Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP
7. Check The Sensors A. Turn key start switch and disconnect switch ON. B. One at a time, disconnect the sensors from the machine harness. C. After disconnecting each sensor, check the status of the diagnostic code.	The diagnostic code is no longer active.	OK - The diagnostic code is not active when one of the sensors is disconnected. The harness circuit is correct. The sensor that was just disconnected has failed. Repair - Replace the sensor in question. Verify that the new sensor has corrected the problem. NOT OK- The diagnostic code remained active. Proceed to Test Step 8.
8. Check The Sensor Supply Voltage At The Sensors A. Turn the key start switch and the disconnect switch ON. B. Disconnect the machine harness connector from the sensors. C. At the machine harness connector for the sensors, measure the voltage between the voltage supply contact and the voltage return contact.	Voltage is 5.0 ± 0.5 VDC, 8.0 ± 0.5 VDC, or 10.0 VDC ± 0.5.	OK - The voltage is appropriate for the circuit as determined by the schematic. Verify that the diagnostic code is present. If the code is still active, go to Test Step 10. STOP NOT OK - The reading is NOT the appropriate voltage as determined by the schematic. The voltage is greater than the expected voltage for the circuit based on the schematic. The sensor supply voltage is NOT correct. Proceed to Test Step 9.
9. Check For A Short Circuit In The Machine Harness A. Turn the key start switch and the disconnect switch OFF. B. Disconnect the sensors from the machine harness one at a time. Disconnect the machine harness connectors from the ECM C. Measure the resistance from the voltage supply wire to all other contacts in the harness.	The resistance measurements are greater than 5K Ω,	OK - The resistance is greater than 5K Ω. The harness circuit resistance is correct. Proceed to Test Step 5. NOT OK - Resistance is less than 5 Ω. The supply wire is shorted to whichever resistance measurements which were low. Repair: Repair or replace the machine harness. Confirm that the harness repair or replacement has corrected the problem. If the diagnostic code is present after harness repair or replacement, replacement of the ECM may be necessary. 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.
10. Check If The Diagnostic Code Remains A. Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation. B. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit. C. Reconnect all harness connectors in order to make sure that the connectors are fully seated. Also, make sure that the clips for each connector are completely fastened. D. Turn the disconnect switch and the key start switch to the ON position. E. Operate the machine. F. Check the status of the diagnostic code.	The diagnostic code is no longer active.	OK - The diagnostic code is not active. The initial diagnostic code was probably caused by a poor electrical connection at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation. STOP NOT OK - The diagnostic code is active. The diagnostic code has not been corrected. Repair: Check the circuit again. ECM failure is unlikely. Perform the Test Step procedure again. If the diagnostic code continues to remain active, ECM replacement may be required. 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. Refer to Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP