D7 Track-Type Tractor Electrohydraulic Systems Alarm

Alarm - Test

D7 Track-Type Tractor Electrohydraulic Systems [M0120325]

D7 Track-Type Tractor Electrohydraulic Systems Brake Does Not Release

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ELECTRICAL AND STARTING SYSTEM

ALARM GP

D7 Track-Type Tractor Electrohydraulic Systems Alarm - Test

1.1. Machine ECM

2.1. Diagnostic Trouble Code Procedure

3.1. FMI 6

Machine ECM

The following is a list of codes that are associated with the backup alarm circuit of the machine.

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Table 1
Machine ECM (MID 39)
J1939	CDL	Code Description	System Response
	637-6	Backup Alarm: Current Above Normal	Alarm will sound continuously

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Illustration 1	g06590280
Schematic of the Backup Alarm

The preceding diagram is a simplified schematic of the connections for the Backup alarm. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of the electrical schematic for the specific machine being serviced for the complete schematic.

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
	538-5051	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. Check the wiring for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that this 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 6 diagnostic code, proceed to "FMI 6".

FMI 6

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Table 3
Check The Solenoid
Troubleshooting Test Steps	Values	Results
1. Turn the start switch and the disconnect switch OFF. 2. Disconnect the solenoid from the machine harness. 3. Turn the start switch and the disconnect switch ON. Do not start the engine. 4. Observe the status of the diagnostic code.	The FMI 6 changes to an FMI 5 after the solenoid is disconnected.	Result: The circuit is correct. The solenoid has failed. Repair: Repeat the test. Verify the solenoid failure. Replace the solenoid. Proceed to "Check If The Diagnostic Code Remains" Table 5. Result: The diagnostic code remains active. Proceed to "Check Machine Harness For A Short To Ground" Table 4.

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Table 4
Check Machine Harness For A Short To Ground
Troubleshooting Test Steps	Values	Results
1. The machine harness remains disconnected from the solenoid. 2. Turn the start switch and the disconnect switch OFF. 3. Disconnect the harness connectors from the ECM. 4. At the harness connector for the ECM, measure the resistance between the solenoid signal contact and all ground contacts.	Each reading is greater than 5K Ω.	Result: Machine harness correct. Proceed to "Check If The Diagnostic Code Remains" Table 5. Result: One or more of the resistance measurements are less than 5 Ω. A short circuit exists in the machine harness. Repair: A short circuit exists between the signal wire and the circuit with the low resistance. 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 "Check If The Diagnostic Code Remains" Table 5.

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Table 5
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. 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, M0120325, "ECM - Replace" if the ECM needs to be replaced. STOP.