815 Soil Compactor and 816 Landfill Compactor Systems ECM Location Code - Test Caterpillar


ECM Location Code - Test
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1.1. Transmission ECM
2.1. Implement ECM
3.1. Diagnostic Trouble Code Procedure
4.2. FMI 2

Transmission ECM

The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the ECM location codes of the machine.

Table 1
Transmission ECM (MID 081) 
J1939  CDL  Code Description  System Response 
  1326-2  ECM Location Code: Erratic, Intermittent, or Incorrect  The features on this ECM may not run. 


Illustration 1g06601715
Transmission ECM Location Code

The preceding diagrams are simplified schematics of the ECM Location Code connections. The schematics are electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, M0115149 or Electrical Schematic, M0115151 for the complete schematic.

Table 2
Location Code 
Hardware Location Code  Transmission ECM  Contact 
LOC 1  ---  J1-26 
LOC 2  GND  J1-27 
LOC 4  ---  J1-28 
LOC Enable  GND  J1-32 

Note: The table above describes the connections of the machine location codes.

Implement ECM

The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the ECM location codes of the machine.

Table 3
Implement ECM (MID 082) 
J1939  CDL  Code Description  System Response 
  1326-2  ECM Location Code: Erratic, Intermittent, or Incorrect  The features on this ECM may not run. 


Illustration 2g06601718

The preceding diagrams are simplified schematics of the ECM Location Code connections. The schematics are electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, M0115149 or Electrical Schematic, M0115151 for the complete schematic.

Table 4
Location Code 
Hardware Location Code  Implement ECM  Contact 
LOC 1  ---  J1-26 
LOC 2  ---  J1-27 
LOC 4  GND  J1-28 
LOC Enable  GND  J1-32 

Note: The table above describes the connections of the machine location codes.

Diagnostic Trouble Code Procedure

Table 5
Required Tools 
Tool  Part Number  Description  Qty 
T1  146-4080(1)  Digital Multimeter Group 
8T-3224 Needle Tip Group 
7X-1710 Multimeter Probe Group 
8T-8726 Cable Assembly (Three Pin) (3-Pin Breakout) 
T2  JERD2129  Cat® Electronic Technician (Cat ET) 
Windows-based PC 
538-5051 Communication Adapter Gp 
T3  6V-4148  Connector Repair Kit (Sure Seal) 
T4  190-8900  Connector Field Repair Kit (Deutsch) 
T5  175-3700  Connector Repair Kit Deutsch DT 
(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.

  1. Identify the active FMI code associated with the components.

  2. 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

Table 6
Verify Hardware And Software Part Numbers 
Troubleshooting Test Steps  Values  Results 
1. Verify that the part numbers for the ECM are correct.

Note:Consult the Technical Communicator at your dealer for the correct part numbers. 
All part numbers are correct.  Result: All part numbers are correct.

Proceed to "The Location Code Should Match The Summary Screen", Table 7.

Result: All part numbers are NOT correct. The installed ECM has the wrong part number or incorrect configuration software.

Repair: Reinstall correct software in the ECM or replace the ECM with the correct part number.

NOTE: Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may effect repair time.

Proceed to "Check If The Diagnostic Code Remains", Table 11. 

Table 7
The Location Code Should Match The Summary Screen 
Troubleshooting Test Steps  Values  Results 
1. Check the Cat® Electronic Technician (Cat ET) Service Tool summary screen for the location code.

Refer to Table 2or 4above to verify that the location code matches the location codes in the summary screen.
 
The location codes in Cat ET are correct.  Result: The location codes in Cat ET are correct.

Proceed to "Inspect The Harness Connections", Table 8.

Result: The location codes are NOT correct.

Repair: Rewire wiring harness to reflect the correct ECM harness location code.

Proceed to "Check If The Diagnostic Code Remains", Table 11. 

Table 8
Inspect The Harness Connections 
Troubleshooting Test Steps  Values  Results 
1. Turn the key start switch and the disconnect switch to the OFF position.

2. Inspect the harness connections that are related to the location code. Make sure that the connectors are clean and tight. 
The machine harness connections are tight and free of corrosion.  Result: The machine harness connectors are tight and free from corrosion.

Proceed to "Check The Harness For A Short", Table 9.

Result: The machine harness connectors are in the need of repair.

Repair: Repair or replace the machine harness.

Proceed to "Check If The Diagnostic Code Remains", Table 11. 

Table 9
Check The Harness For A Short 
Troubleshooting Test Steps  Values  Results 
1. The disconnect switch and the key start switch remain in the OFF position.

2. Disconnect the machine harness from the ECM.

3. At the ECM harness connector, measure the resistance between the location code contacts and all the other contacts that are used for the ECM.

Note: Refer to the table above for the ECM location code connections. 
Each resistance is greater than 5K Ω.

NOTE: If one of the contacts in the harness is frame ground, then there would be a short to ground. 
Result: The resistance is greater than 5K Ω. The harness circuit is correct.

Proceed to "Check The Harness For An Open", Table 10.

Result: One or more readings less than 5 Ω. The short is between the location code and the circuit with the low resistance.

NOTE: If one of the contacts in the harness is for frame ground, these measurements are correct. Do not repair. Proceed to Test Step 5.

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 "Check If The Diagnostic Code Remains", Table 11. 

Table 10
Check The Harness For An Open 
Troubleshooting Test Steps  Values  Results 
1. The disconnect switch and the key start switch remain in the OFF position.

2. The ECM harness connectors remain disconnected.

3. At the machine harness for the ECM, measure the resistance between the location code contacts and frame ground.

Note: Refer to the table above for the ECM location code connections. 
Each contact that is grounded has a resistance less than 5 Ω.  Result: Each contact that is grounded has a resistance that is less than 5 Ω. The harness circuit is correct.

Proceed to "Check If The Diagnostic Code Remains", Table 11.

Result: When all four contacts are grounded, one or more readings is greater than 5 Ω. The machine harness has failed.

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 "Check If The Diagnostic Code Remains", Table 11. 

Table 11
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 key 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

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