320D3 and 323D3 Excavators Machine Electronic Control System Sensor Signal (Analog, Active)

Sensor Signal (Analog, Active) - Test

320D3 and 323D3 Excavators Machine Electronic Control System [M0094857]

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ELECTRICAL AND STARTING SYSTEM

SENSOR GP

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320D3 and 323D3 Excavators Machine Electronic Control System Sensor Signal (Analog, Active) - Test

1.1. Machine ECM

2.1. Diagnostic Trouble Code Procedure

Machine ECM

The following is a list of codes that are associated with the active (analog) circuits of the machine.

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Table 1
Machine ECM (MID 299)
DTC	Code Description	System Response
100-3	Engine Oil Pressure Sensor : Voltage Above Normal	Oil pressure sensor will read incorrectly. Engine may not operate as requested.
100-4	Engine Oil Pressure Sensor : Voltage Below Normal	Oil pressure sensor will read incorrectly. Engine may not operate as requested.
2263-3	Right Travel Pressure Sensor : Voltage Above Normal	Travel will not operate as requested.
2263-4	Right Travel Pressure Sensor : Voltage Below Normal	Travel will not operate as requested.
2264-3	Left Travel Pressure Sensor : Voltage Above Normal	Travel will not operate as requested.
2264-4	Left Travel Pressure Sensor : Voltage Below Normal	Travel will not operate as requested.
3528–3	Barometric Pressure Sensor : Voltage Above Normal	Engine may not operate as requested.
3528–4	Barometric Pressure Sensor : Voltage Below Normal	Engine may not operate as requested.
3798-3	Straight Travel Pressure Sensor : Voltage Above Normal	Travel will not operate as requested when straight travel pedal is used.
3798-4	Straight Travel Pressure Sensor : Voltage Below Normal	Travel will not operate as requested when straight travel pedal is used.
4785-3	Implement Pilot Oil Pressure Sensor #1 : Voltage Above Normal	Implement functions may operate on a limited basis.
4785-4	Implement Pilot Oil Pressure Sensor #1 : Voltage Below Normal	Implement functions may operate on a limited basis.

Possible Causes for an FMI 3 Diagnostic code are:

The power supply circuit for the sensor is open.
The return circuit is open.
The signal circuit is open or the sensor is disconnected.
The signal circuit is shorted to the sensor power supply.
The sensor has failed.
The Machine ECM has failed. This situation is unlikely.

Possible Causes for an FMI 4 Diagnostic code are:

The signal circuit for the sensor is shorted to ground.
The sensor has failed.
The Machine ECM has failed. A failure of the Machine ECM is unlikely.

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Illustration 1	g06613259
Sensor Signal (Analog, Active) schematic

Note: The diagram above is a simplified schematic of the Machine ECM connections. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, M0094859 for 320D3 and M0094901 for 323D3 excavator electrical systems.

Diagnostic Trouble Code Procedure

Note: Prior to beginning 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, secure and 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.

Identify the active FMI code associated with the faulty component.
Determine which code is present and use the list below to determine the correct procedure to follow.
- FMI 3 diagnostic code, proceed to Table 2.
- FMI 4 diagnostic code, proceed to Table 3.

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Table 2
Begin Process For FMI 3 Troubleshooting HERE
Troubleshooting Test Steps	Values	Results
1. Check The Voltage At The Sensor A. Turn key start switch and disconnect switch ON. B. Refer to the schematic to determine the voltage source for the sensor. C. At the machine harness connector for the sensor, insert 7X-1710 multimeter probes along the sensor supply and sensor return. D. At the sensor harness connector, measure voltage between the sensor supply and sensor return.	Voltage is 5.0 VDC ± 0.3.	OK - Voltage is 5.0 VDC ± 0.3. Proceed to Test Step 2. NOT OK- Voltage is NOT 5.0 VDC ± 0.3. Repair - Check the machine harness for damage. Repair or replace the machine harness. STOP
2. Check The Harness For An Open A. The key start switch and the disconnect switch remain in the OFF position. B. Disconnect the machine harness connector from the sensor. C. At the sensor harness connector, install a jumper wire between the sensor return contact and signal contact. D. Turn the key switch and disconnect switch to the ON position. E. Observe the status of the diagnostic code.	The diagnostic code changes from an FMI 3 to an FMI 4.	OK – The diagnostic code changes from an FMI 3 to an FMI 4. The sensor has failed. Repair: Replace the sensor. Proceed to Test Step 4. NOT OK – The diagnostic code does not change from an FMI 3 to an FMI 4. Proceed to Test Step 3.
3. Check Signal Circuit For A Short To +Battery A. Turn the key start switch and the disconnect switch to the OFF position. B. Disconnect the ECM harness connectors. The sensor harness connector remains disconnected. C. Remove the jumper wire that was installed in the previous test step. D. At the ECM harness connector, measure the resistance between the signal contact and all other +battery circuits used in the ECM harness connectors.	Each resistance is greater than 5K Ω.	OK: Each resistance is greater than 5K Ω. The harness circuit is correct. Proceed to Test Step 4. NOT OK: The resistance is less than 5 Ω. A short exists in the harness between the signal circuit and the circuit with the low-resistance measurement. 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. Proceed to Test Step 4.
4. 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 the machine and engage the safety lock lever. E. Check if the diagnostic code for the sensor is active.	Code for sensor is NO longer present.	OK - The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP NOT OK - Diagnostic trouble code has not been corrected. Recheck the circuit and perform this procedure again. 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 Machine ECM. STOP

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Table 3
Begin Process For FMI 4 Troubleshooting HERE
Troubleshooting Test Steps	Values	Results
1. Check The Sensor A. Turn the disconnect switch and the key start switch to the ON position. B. Disconnect the sensor from the machine harness. C. Observe the status of the diagnostic code as the sensor is disconnected from the harness.	The code changes from an FMI 4 to an FMI 3 when the sensor is disconnected.	OK - The code changes from an FMI 4 to an FMI 3 when the sensor is disconnected. The sensor has failed. Repair: Replace the sensor. Proceed to Test Step 3. NOT OK - The FMI 4 diagnostic code remains active when sensor is disconnected. The sensor is not the cause of the problem. Proceed to Test Step 2.
2. Check The Signal Circuit For A Short To Ground A. Turn the key start switch and the disconnect switch to the OFF position. B. Disconnect the harness connectors from the ECM. C. At the ECM harness connector, measure the resistance between the sensor signal contact and all other contacts used in the ECM harness connectors.	The resistance is greater than 5K Ω.	OK - The resistance is greater than 5K Ω. The harness circuit is correct. Proceed to Test Step 3. NOT OK - The resistance is less than 5 Ω. A short circuit exists between the signal circuit and the circuit with the low-resistance measurement. 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. Proceed to Test Step 3.
3. 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 the machine and engage the safety lock lever. E. Check if the diagnostic code for the sensor is active.	Code for sensor is NO longer present.	OK - The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP NOT OK - Diagnostic trouble code has not been corrected. Recheck the circuit and perform this procedure again. 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 Machine ECM. STOP