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PL72, PL83 and PL87 Pipelayers Caterpillar


Data Link - Test

Usage:

PL83 CB2
Each CAN data link circuit is an input and output of select electronic control modules (ECMs). The CAN data link is designed to carry communications between the ECMs. The CAN data link is not a visible component. The CAN data link consists of internal control circuits and the connecting harness wiring.

Data Link - Test

Power Train ECM

The following is a list of codes that are associated with the data link of the machine.

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Table 1
Power Train ECM    
DTC     Code Description     System Response    
246-9     Proprietary CAN Data Link : Abnormal Update Rate     When these conditions exist, certain machine functionality may be limited or prevented.    
246-14     Proprietary CAN Data Link : Special Instruction     When these conditions exist, certain machine functionality may be limited or prevented.    
247-9     SAE J1939 Data Link : Abnormal update rate     Communication loss between engine and chassis control only. The only companion code supported is the engine control. Transmission shifting will be harsher. A Level 2 code will be generated after a 6 second delay.    
247-14     SAE J1939 Data Link : Special Instruction        
588-9     Monitoring System Display: Abnormal Update Rate     When these conditions exist, certain machine functionality may be limited or prevented.    
588-14     Monitoring System Display: Special Instruction        
590-9     Engine Control Module: Abnormal Update Rate     When these conditions exist, certain machine functionality may be limited or prevented.    
590-14     Engine Control Module: Special Instruction     When these conditions exist, certain machine functionality may be limited or prevented.    
596-9     Implement Control: Abnormal Update Rate     When these conditions exist, certain machine functionality may be limited or prevented.    
596-14     Implement Control: Special Instruction     When these conditions exist, certain machine functionality may be limited or prevented.    
2348-9     SAE J1939 Data Link #2 : Abnormal Update Rate     When these conditions exist, certain machine functionality may be limited or prevented.    
2348-14     SAE J1939 Data Link #2 : Special Instruction     When these conditions exist, certain machine functionality may be limited or prevented.    

Possible Causes for an FMI 9 or FMI 14 Diagnostic Code Are:

  • Loose harness connections.

  • Open wires.

  • Problems with the terminating resistors.

  • Wires that are shorted to ground.

  • Wires that are shorted to the battery.

  • Data link high (+) wire is shorted to the data link low (-) wire.

  • High resistance across the Data Link.

  • Interference across the wires for the Data Link.

  • Incompatible software.

  • Incorrect set-up for parameters.

  • Failure of a smart device.

  • An ECM has failed. An ECM failure is unlikely.

Note: The FMI 09 means the ECM has lost all communication with another control module. When these conditions exist, certain machine functionality may be limited or prevented.

Note: The FMI 14 means the ECM has lost some, but not all, communication with another control module. When these conditions exist, certain machine functionality may be limited or prevented.

Show/hide table

Illustration 1g03851474

Schematic of the Data Link

Note: The diagram above is a simplified schematic of the Data Link connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision for the complete schematic:

Reference(PL72 HRC) Electrical System Schematic, UENR5939

Reference(PL72 LRC) Electrical System Schematic, UENR5940

Reference(PL83 HRC) Electrical System Schematic, UENR4145

Reference(PL83 LRC) Electrical System Schematic, UENR4146

Reference(PL87 HRC) Electrical System Schematic, UENR4145

Reference(PL87 LRC) Electrical System Schematic, UENR4146

Implement ECM

The following is a list of codes that are associated with the data link of the machine.

Show/hide table
Table 2
Implement ECM    
DTC     Code Description     System Response    
247-9     SAE J1939 Data Link: Abnormal update rate     Communication loss between engine and chassis control only. The only companion code supported is the engine control. Transmission shifting will be harsher. A Level 2 code will be generated after a 6 second delay.    
247-14     SAE J1939 Data Link: Special Instruction     When these conditions exist, certain machine functionality may be limited or prevented    
588-9     Monitoring System Display: Abnormal Update Rate     When these conditions exist, certain machine functionality may be limited or prevented.    
588-14     Monitoring System Display: Special Instruction     When these conditions exist, certain machine functionality may be limited or prevented.    
590-9     Engine Control Module: Abnormal Update Rate     When these conditions exist, certain machine functionality may be limited or prevented.    
590-14     Engine Control Module: Special Instruction     When these conditions exist, certain machine functionality may be limited or prevented.    
596-9     Implement Control: Abnormal Update Rate     When these conditions exist, certain machine functionality may be limited or prevented.    
596-14     Implement Control: Special Instruction     When these conditions exist, certain machine functionality may be limited or prevented.    
2348-9     SAE J1939 Data Link #2 : Abnormal Update Rate     When these conditions exist, certain machine functionality may be limited or prevented.    
2348-14     SAE J1939 Data Link #2 : Special Instruction     When these conditions exist, certain machine functionality may be limited or prevented.    

Possible Causes for an FMI 9 or FMI 14 Diagnostic Code Are:

  • Loose harness connections.

  • Open wires.

  • Problems with the terminating resistors.

  • Wires that are shorted to ground.

  • Wires that are shorted to the battery.

  • Data link high (+) wire is shorted to the data link low (-) wire.

  • High resistance across the Data Link.

  • Interference across the wires for the Data Link.

  • Incompatible software.

  • Incorrect set-up for parameters.

  • Failure of a smart device.

  • An ECM has failed. An ECM failure is unlikely.

Note: The FMI 09 means the ECM has lost all communication with another control module. When these conditions exist, certain machine functionality may be limited or prevented.

Note: The FMI 14 means the ECM has lost some, but not all, communication with another control module. When these conditions exist, certain machine functionality may be limited or prevented.

Show/hide table

Illustration 2g03851474

Schematic of the Data Link

Note: The diagram above is a simplified schematic of the Data Link connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision for the complete schematic:

Reference(PL72 HRC) Electrical System Schematic, UENR5939

Reference(PL72 LRC) Electrical System Schematic, UENR5940

Reference(PL83 HRC) Electrical System Schematic, UENR4145

Reference(PL83 LRC) Electrical System Schematic, UENR4146

Reference(PL87 HRC) Electrical System Schematic, UENR4145

Reference(PL87 LRC) Electrical System Schematic, UENR4146

Diagnostic Trouble Code Procedure

Note: 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. For sensors powered via the fuse panel, check the condition of the appropriate fuse before beginning the troubleshooting procedure.

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Table 3
Troubleshooting Test Steps     Values     Results    
1. Use the Data Link Health Monitor to determine the communication issue

A. In Cat ET, click the "Diagnostics" tab on the toolbar.

B. Select the "System Communication Status" option from the drop-down list.    		 Component identified     OK - All part numbers are correct.

STOP

NOT OK - A -9 or -14 code is active.

Note: ECM 1 and 2 are listed in the ECMs column in Cat ET.

Proceed to Test Step 2.    
2. Verify Component Part Number

A. Locate the part numbers of the components identified by the Data Link Health Monitor. Verify that the part numbers are correct.    
All part numbers are correct.    		 OK - All part numbers are correct.

Proceed to Test Step 3.

NOT OK - All of the part numbers are not correct.

Repair: A module has the wrong part number. Replace the incorrect module with a module that has the correct part number.

Proceed to Test Step 7    
3. Verify Software Part Number (if applicable)

A. Locate the software part number of the components identified by the Data Link Health Monitor. Verify that the part numbers are correct.    
All part numbers are correct    		 OK - All part numbers are correct.

Proceed to Test Step 4.

NOT OK - All of the part numbers are not correct.

Repair: A module has the wrong software part number. Flash the correct software. See the "Troubleshooting, "ECM - Software - Install" section of this manual for additional information.

Proceed to Test Step 7.    
4. Check The Voltage Of The CAN Data Link

A. Turn the key switch and the disconnect switch OFF

B. Inspect all harness connections related to the CAN Data Link. Make sure that the connectors are clean and tight.

C. Check the connectors for proper mating. Ensure that all seals are present and in place.

D. Check the harness for signs of damage or abrasion.

E. Check the wires at the connectors. Ensure that the wires are secured tightly into the connector.

Note: Do not to pull the wire out of the connector.

F. Check the exposed wires at the connectors for nicks or signs of abrasion.

G. Check for moisture inside the connectors.

H. Check the connectors for dirty or corroded contacts.

I. Check each pin and socket of the machine harness connectors. Ensure that the contacts are properly installed. The contacts should mate correctly when the two pieces of the connector are placed together.    
The machine harness connectors are tight and free of corrosion    		 OK - The machine harness connectors are tight and free of corrosion.

Proceed to Test Step 5.

NOT OK - The machine harness connectors are in need of repair.

Repair: Repair or replace the machine harness.

Proceed to Test Step 7    
5. Check the Resistance of the Data Link

A. Turn the keys witch to the OFF position..

B. Measure the resistance of the data link between ECM 2 data link (+) wire and ECM 2 data link (-) wire. Refer to the "CAN DATA LINK CIRCUIT DIAGRAM".    
The resistance of the data link is 60 ± 10 Ohms    		 OK - The resistance measurement is correct.

Proceed to Step 6.

NOT OK - The resistance measurement is less than 50 Ohms.

Repair: There is a short between the + battery circuit and one of the CAN data link circuits in the machine harness. Repair or replace the machine harness.

Proceed to Step 7.

NOT OK - The resistance is 120 ± 10 Ohms.

Repair: There is a problem with both terminating resistors or an open circuit has been detected. Repair or replace the machine harness.

Proceed to Test Step 7

NOT OK - The resistance is greater than 130 Ohms.

Repair: There is a problem with both terminating resistors or an open circuit has been detected. Repair or replace the machine harness.

Proceed to Test Step 7    
6. Check the Power and Ground to the Components

A. Turn the key switch to the ON position.

B. Measure the voltage between the + battery and - battery terminals on the wiring harness connectors to each component identified in the Data Link Health Monitor. Refer to the appropriate wiring diagram.    
Battery voltage    		 OK - The voltage measurements are correct.

Proceed to Step 7.

NOT OK - The voltage measurements are not correct.

Repair: There is an open or short in the wiring circuit. Repair or replace the wiring circuit.

Proceed to Test Step 7    
7. Use the Data Link Health Monitor to determine the communication issue

A. In Cat ET, click the "Diagnostics" tab on the toolbar.

B. Select the "System Communication Status"option from the drop-down list.    
Component identified.    		 OK - No codes are active.

STOP


NOT OK - A -9 or -14 code is active.

Repair: A failure of the ECM is unlikely. If the cause of the diagnostic code is not found, the ECM may have failed. Prior to replacing and ECM, contact the Technical Communicator for your dealership for possible consultation with Caterpillar. This consultation may impact repair time. If the ECM requires replacement, see the "Troubleshooting, "ECM - Replace" section of this manual for additional information.

STOP.    

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