140 Motor Grader Electrical Troubleshooting Caterpillar

Sensor (Data Link Type) - Test

Usage:

140 N94

Implement ECM

The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the sensor (data link type) of the machine.

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Table 1
Implement/Grade Control ECM (MID 082)
J1939	CDL	Code Description	System Response
	3694-2	Blade Slope Sensor: Data Erratic, Intermittent, or Incorrect	A Warning Level 1 Will Be Generated

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Illustration 1	g06372711

Note: The diagram above is a simplified schematic of the data link sensors and connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic , M0098753 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
	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. 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 2 diagnostic code, proceed to "FMI 2"

FMI 2

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Table 3
Inspect The Harness Connections
Troubleshooting Test Steps	Values	Results
1. Turn key start switch and disconnect switch OFF. 2. Inspect all harness connections related to the CAN data link. Make sure that the connectors are clean and tight. 3. Check the connectors for proper mating. Ensure that all the seals are present and in place. 4. Check the harness for signs of damage or abrasion. 5. Check the wires at the connector. Ensure that the wires are secured tightly into the connector. Take care not to pull the wire out of the connector. 6. Check the exposed wires at the connectors for nicks or signs of abrasion. 7. Check for moisture inside the connector.	The machine harness connectors are tight and free of corrosion.	Result: The machine harness connectors are tight and free of corrosion. Proceed to "Verify The Hardware And The Software Part Numbers" Table 4. Result: The machine harness connectors are in need of repair. Repair: Repair or replace the machine harness. Proceed to "Check If The Diagnostic Code Remains" Table 5.

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Table 4
Verify The Hardware And The Software Part Numbers
Troubleshooting Test Steps	Values	Results
1. Verify that the following information is correct: The part number of the flash software for the ECM is correct. The part number of the ECM is correct. The part numbers of the sensors are correct.⁽¹⁾	All the part numbers are correct.	Result: All the part numbers are correct. Proceed to "Check If The Diagnostic Code Remains" Table 5. Result: All the part numbers are not correct. Repair: The ECM or the sensors have the wrong part number or incorrect flash software is installed. Flash the correct software or replace the incorrect ECM or the sensor with a module that has the correct part number. Refer to the Troubleshooting, "ECM - Flash Program" section for additional information. Proceed to "Check If The Diagnostic Code Remains" Table 5.

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⁽¹⁾	Consult your Caterpillar Authorized Dealer for the correct part numbers of the flash software.

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Table 5
Check If The Diagnostic Code Remains
Troubleshooting Test Steps	Values	Results
1. Turn the key start switch and the disconnect switch to the ON position. 2. Clear all diagnostic codes. 3. Operate the machine. 4. Stop the machine and engage the safety lock. 5. 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 Caterpillar. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP.