320D3 GC Excavators Machine Electronic Control System Alarm

Alarm - Test

320D3 GC Excavators Machine Electronic Control System [M0117992]

320D3 GC Excavators Machine Electronic Control System Event Codes

320D3 GC Excavators Machine Electronic Control System CAN Data Link - Test

ELECTRICAL AND STARTING SYSTEM

ALARM GP

320D3 GC Excavators Machine Electronic Control System Alarm - Test

1.1. Machine ECM

2.1. Diagnostic Trouble Code Procedure

3.2. FMI 3

4.2. FMI 5

Machine ECM

The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the alarm circuits of the machine.

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Table 1
Machine ECM (MID 299)
J1939	CDL	Code Description	System Response
	271-3	Action Alarm : Voltage Above Normal	The alarm may sound constantly.
	271-5	Action Alarm : Current Below Normal	The alarm will not sound when a visual alert is present.
	271-6	Action Alarm : Current Above Normal	The alarm may sound constantly.

The alarm is an output of the ECM. The alarm alerts the operator of a fault condition (fault alarm). The alarm also alerts people in the general area of the machine (backup alarm).

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Illustration 1	g06575521
Action Alarm schematic

Note: The diagram above is a simplified schematic of the Switch Panel connections. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, M0116913 for 320D3 GC excavator electrical systems.

Diagnostic Trouble Code Procedure

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Table 2
Required Tools
Tool	Part Number	Description	Qty
T1	146-4080⁽¹⁾	Digital Multimeter Group	1
	8T-3224	Needle Tip Group	1
	7X-1710	Multimeter Probe Group	1
	8T-8726	Cable Assembly (Three Pin) (3-Pin Breakout)	1
T2	JERD2129	Cat^® Electronic Technician (Cat ET)	1
		Windows-based PC	1
	466-6258	Communication Adapter Gp	1
T3	6V-4148	Connector Repair Kit (Sure Seal)	1
T4	190-8900	Connector Field Repair Kit (Deutsch)	1
T5	175-3700	Connector Repair Kit Deutsch DT	1

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⁽¹⁾	This multimeter can use an RS232C cable to connect to a Laptop computer or Dataview tool gp for troubleshooting.

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.

Identify the active FMI code associated with the components.
Determine which code is present and use the list below to determine which procedure to follow.

FMI 3 diagnostic code, proceed to "FMI 3".
FMI 5 diagnostic code, proceed to "FMI 5".

FMI 3

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Table 3
Check The Power Circuit For A Short
Troubleshooting Test Steps	Values	Results
1. Turn the start switch and disconnect switch to the OFF position. 2. Disconnect the harness connectors from the ECM. 3. Disconnect the travel alarm from the machine harness. 4. At the connector for the ECM, measure the resistance between the travel alarm contact and all sources for +battery.	Each value is greater than 5K Ω.	Result: Each value is greater than 5K Ω. Proceed to "Check If The Diagnostic Code Remains", Table 4. Result: Resistance is less than 5 Ω, a short exists in signal circuit. Repair: Repair or replace machine harness. Note: A resistance greater than 5 Ω but less than 5K Ω indicates a loose or a corroded connection in the circuit. A resistance value greater than 5K Ω indicates an open in the circuit. Proceed to "Check If The Diagnostic Code Remains", Table 4.

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Table 4
Check If The Diagnostic Code Remains
Troubleshooting Test Steps	Values	Results
1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the start switch and the disconnect switch ON. 3. Clear all diagnostic codes. 4. Operate the machine. 5. Stop the machine and engage the safety lock lever. 6. Check if the diagnostic code is active.	The diagnostic code is no longer present.	Result: 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. Result: The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the 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 effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP.

FMI 5

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Table 5
Check The Alarm
Troubleshooting Test Steps	Values	Results
1. Turn the start switch and the disconnect switch to the OFF position. 2. Disconnect the alarm from the machine harness. 3. Place a jumper wire between contact 1 and contact 2, at the harness connector for the alarm. 4. Turn the start switch and the disconnect switch ON. Do not start the engine.	The FMI 5 diagnostic code changes to an FMI 6 after the jumper wire is installed.	Result: The harness is correct. The FMI 5 diagnostic code changes to an FMI 6 when the jumper wire is installed. The alarm has failed. Repair: Replace the alarm. Proceed to "Check If The Diagnostic Code Remains", Table 7. Result: The diagnostic code remains active. Proceed to "Check The Harness For An Open", Table6 .

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Table 6
Check The Harness For An Open
Troubleshooting Test Steps	Values	Results
1. Turn the start switch and the disconnect switch to the OFF position. 2. Disconnect the harness connectors from the ECM. 3. The jumper wire remains that was installed in the previous test step remains in place. 4. At the machine harness connector for the ECM, measure the resistance between the signal contact and ground contact.	Each reading is less than 5 Ω.	Result: The reading is less than 5 Ω. The harness is correct. Proceed to "Check If The Diagnostic Code Remains", Table 7. Result: The reading is greater than 5K Ω. The circuit is open in the machine harness. Repair: The open is in the signal wire or the return wire. Repair or replace the machine harness. Note: A resistance greater than 5 Ω but less than 5K Ω indicates a loose or a corroded connection in the circuit. A resistance value greater than 5K Ω indicates an open in the circuit. Proceed to "Check If The Diagnostic Code Remains", Table 7.

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Table 7
Check If The Diagnostic Code Remains
Troubleshooting Test Steps	Values	Results
1. Reconnect all harness connectors. Return machine to normal operating condition. 2. Turn the start switch and the disconnect switch to the ON position. 3. Clear all diagnostic codes. 4. Operate the machine. 5. Stop the machine and engage the safety lock lever. 6. Check if the diagnostic code is active.	The diagnostic code is no longer present.	Result: 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. Result: The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the 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 effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP.