SEAL 4N2786 - Caterpillar

Use this procedure to solve communication problems between the Caterpillar Electronic Technician (ET) and the Electronic Control Module (ECM). Cat ET must communicate with the ECM on the Cat Data Link and on the CAN data link in order to service the engine fully.Indicators on the communication adapter indicate that communication is occurring on a particular data link. The "J1939/DeviceNet" indicator indicates that the communication adapter is communicating on the CAN data link. The "Cat Data Link" indicator indicates that the communication adapter is communicating on the Cat Data Link. Cat ET displays a message during an attempt to connect if Cat ET cannot communicate on both data links.The following conditions can cause a communication problem:
Incorrect communication adapter
Use of a wireless communications adapter
Use of a parallel cable between the communication adapter and the PC
Incorrect version of Cat ET
Incorrect firmware in the communication adapter
Incorrect configuration of Cat ET
A problem with electrical power to the communication adapter
A problem with electrical power to the engine ECM
A problem with the wiring for a data link
A problem with the electrical cables between the PC and the vehicle
Table 1
Troubleshooting Test Steps    Values    Results    
1. Determine the Problem
A. Identify the communication problem.
Note: If Cat ET is not communicating and the "POWER" indicator is not illuminated, cycle the power to the communications adapter.
   
Determine the Problem    
Results: Both indicators on the communication adapter are not flashing.
Proceed to Test Step 2
Results: Cat ET indicates the engine must be serviced on two both links.
Proceed to Test Step 2
Results: Cat ET displays a message that indicates the firmware in the communication adapter does not support communication on both data links.
Proceed to Test Step 3
Results: Cat ET displays a "Error #142 The interface hardware is not responding" message.
Proceed to Test Step 3
Results: Cat ET displays a message that indicates that Cat ET cannot find an exact match for the software version in the ECM.
Repair: Update Cat ET to the latest available version.
Results: The power indicator is not illuminated.
Proceed to Test Step 5
   
2. Verify that the Correct Communication Adapter is being Used
A. A 317-7484 Communication Adapter Gp must be used to communicate. The following communication adapters cannot be used because the communication adapters do not communicate over both data links:
- Wireless communication adapter
- 7X-1701 Communication Adapter As
B. Identify the communication adapter that is being used.
   
Correct Communication Adapter    
Results: An incorrect communication adapter is being used.
Repair: Obtain the correct communication adapter. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
Establish communication on both data links. Continue with this procedure if the communication adapter does not communicate on both data links.
Results: A correct communication adapter is being used. However, the "Power" indicator is not illuminated.
Proceed to Test Step 5
Results: A correct communication adapter is being used. The "Power" indicator is illuminated.
Proceed to Test Step 4
   
Table 2
3. Check the Version of the Firmware for the Communication Adapter
Note: The version of the firmware for the communication adapter must be "3.0.0" or higher.
A. Electronically disconnect Cat ET. Verify that