| |
| Illustration 1 | g02143107 |
|
Connections of the Cat Data Link | |
This diagnostic code is associated with the communication across the Cat Data Link between the Power Train ECM and the Implement ECM.
The FMI 09 means that the Power Train ECM is not receiving expected communication from the Implement ECM.
The possible causes of this diagnostic code are listed:
- An open circuit or a poor connection in the Cat Data Link between the Implement ECM and the Power Train ECM.
- The Power Train ECM has failed. An ECM failure is unlikely.
The Power Train ECM is the only control that has activated a diagnostic code for communication over the Cat Data Link. If multiple diagnostic codes are active for communication with the Implement ECM, check for problems in the connectors or problems near the Implement ECM. The problem may be with the Implement ECM.
Test Step 1. Verify the hardware and the software part numbers
- Verify that the following information is correct:
- The part number of the software for the Power Train ECM
- The part number of the software for the Implement ECM
- The part number of the Power Train ECM
- The part number of the Implement ECM
Expected Result:
All of the part numbers are correct.
Results:
- YES - All of the part numbers are correct. Proceed to Test Step 2.
- NO - All part numbers are not correct. The part number for an ECM may be incorrect. The incorrect configuration software may be installed.
Repair: Replace the incorrect ECM with an ECM that has the correct part number. Flash the correct configuration software. Refer to Troubleshooting, "Electronic Control Module (ECM) - Flash Program".
STOP
Test Step 2. Inspect the harness connections
- Turn the key start switch and the disconnect switch to the OFF position.
- Inspect all harness connections that are related to the Cat Data Link. Make sure that the connectors are clean and tight.
Note: Refer to Troubleshooting, "Electrical Connector - Inspect"
Expected Result:
The machine harness connectors are tight and free of corrosion.
Results:
- YES - The machine harness connectors are tight and free of corrosion. Proceed to Test Step 3.
- NO - The machine harness connectors are in need of repair.
Repair: Repair the machine harness or replace the machine harness.
STOP
Test Step 3. Check for shorts to ground
- The disconnect switch remains in the OFF position.
- Disconnect the machine harness from all electronic control modules that use the Cat Data Link.
- At the machine harness for the Power Train ECM, measure the resistance between frame ground and connector contacts J1-10 wire (893-GN(Green)) and J1-20 wire (892-BR(Brown)).
Expected Result:
The resistance is greater than 5000 ohms.
Results:
- YES - The resistance is greater than 5000 ohms. The harness circuit resistance is correct. Proceed to Test Step 4.
- NO - The resistance is less than 5000 ohms. The machine harness has failed.
Repair: There is a short between frame ground and the Cat Data Link circuit in the machine harness. Repair the machine harness or replace the machine harness.
STOP
Test Step 4. Check for a short to the +battery circuit
- The disconnect switch remains in the OFF position.
- All related electronic control modules remain disconnected from the machine harness.
- At the machine harness connector for the Power Train ECM, perform the checks that are listed here:
- Measure the resistance between contact J1-10 wire (893-GN(Green)) and all possible sources of positive battery from the ECM.
- Measure the resistance between contact J1-20 wire (892-BR(Brown)) and all possible sources of positive battery from the ECM.
Expected Result:
The resistance is greater than 5000 ohms.
Results:
- YES - The harness circuit resistance is correct. Proceed to Test Step 5.
- NO - The resistance is less than 5000 ohms. The machine harness has failed.
Repair: There is a short between the +battery circuit and the Cat Data Link circuit in the machine harness. Repair the machine harness or replace the machine harness.
STOP
Test Step 5. Check for an open harness
- The key start switch and the disconnect switch remain in the OFF position.
- All related electronic control modules remain disconnected from the machine harness.
- Check the continuity of the Cat Data Link circuit in the machine harness:
- Measure the resistance between connector contact J1-10 wire (893-GN(Green)) of the Power Train ECM and connector contact J1-10 wire (893-GN(Green)) of the Implement ECM.
- Measure the resistance between connector contact J1-20 wire (892-BR(Brown)) of the Power Train ECM and connector contact J1-20 wire (892-BR(Brown)) of the Implement ECM.
Expected Result:
The resistance measures less than 5 ohms.
Results:
- YES - The resistance is less than 5 ohms. The Cat Data Link circuit in the machine harness is correct. Proceed to Test Step 6.
- NO - The resistance is greater than 5 ohms. The machine harness has failed.
Repair: The Cat Data Link circuit is open in the machine harness. Repair the machine harness or replace the machine harness.
STOP
Test Step 6. Check for additional diagnostic codes for the other electronic control modules
- Reconnect all of the electronic control modules that use the Cat Data Link.
- Turn the disconnect switch and the key start switch to the ON position.
- After each of the electronic control modules has been reconnected, check for diagnostic codes that are logged against the electronic control module.
Expected Result:
Diagnostic codes are not present for the other electronic control modules.
Results:
- YES - Diagnostic codes are not present for the other electronic control modules.
Repair: Check the Cat Data Link circuit again. If the cause cannot be found, the Implement ECM may have failed. An ECM failure is unlikely. Prior to replacing an ECM, always contact your technical communicator for possible consultation with Caterpillar. This consultation may greatly reduce repair time. Refer to Troubleshooting, "Electronic Control Module (ECM) - Replace".
STOP
- NO - Diagnostic codes are present for communication between the Power Train ECM and other electronic control modules. The Power Train ECM may have failed.
Repair: Check the Cat Data Link circuit again. If the cause cannot be found, the Power Train ECM may have failed. An ECM failure is unlikely. Prior to replacing an ECM, always contact your technical communicator for possible consultation with Caterpillar. This consultation may greatly reduce repair time. Refer to Troubleshooting, "Electronic Control Module - Replace".
STOP