C7.1 Engines and Generator Sets Caterpillar

Use this procedure to solve communication problems between the electronic service tool and the Electronic Control Module (ECM). The electronic service tool must communicate with the ECM on the Cat data link and the J1939 data link.

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 J1939 data link. The "J1708" indicator indicates that the communication adapter is communicating on the Cat data link. The electronic service tool displays a message during the connection if the electronic service tool cannot communicate on both data links.

The following conditions can cause a communication problem:

• Incorrect communication adapter

• Incorrect version of the electronic service tool

• Incorrect firmware in the communication adapter

• Incorrect configuration of the electronic service tool

• A fault in the electrical power to the communication adapter

• A fault in the electrical power to the engine ECM

• A fault in the wiring for a data link

• A fault in the electrical cables between the PC and the machine

Table 1

Troubleshooting Test Steps	Values	Results
1. Determine the Fault A. If an indicator other than the "POWER" indicator is illuminated when the electronic service tool is not communicating with an ECM, disconnect and reconnect the communication adapter.	Communication problem	Result: Both indicators on the communication adapter are not flashing. Proceed to Test Step 2. Result: The electronic service tool indicates that the engine is serviced on both links. Proceed to Test Step 2. Result: The electronic service tool displays a message that indicates the firmware in the communication adapter does not support communication on both data links. Proceed to Test Step 3. Result: The electronic service tool displays an Error"#142 The interface hardware is not responding" message. Proceed to Test Step 3. Result: The electronic service tool indicates that the electronic service tool cannot find an exact match for the software version in the ECM. Repair: Update the electronic service tool to the latest available version. Result: 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 with a 370-4617 Cable As (USB) and a 457-6114 Cable As (Datalink Cable CA3) to communicate. The following communication adapters cannot be used because the communication adapters do not communicate over both data links: 1. Wireless communication adapter 2. 7X-1701 Communication Adapter As B. Determine the communication adapter that is being used.	Communication Adapter	Result: An incorrect communication adapter is being used. Repair: Connect a correct communication adapter. Refer to Troubleshooting, "Electronic Service Tools", if necessary. Attempt to establish communication. Continue with this procedure if the communication adapter does not communicate on both data links. Result: A correct communication adapter is being used. However, the "Power" indicator is not illuminated. Proceed to Test Step 5. Result: A correct communication adapter is being used. The "Power" indicator is illuminated. Proceed to Test Step 4.
3. Check the Version of the Firmware for the Communication Adapter The version of the firmware for the communication adapter must be "1.18.47" or higher. A. Electronically disconnect the electronic service tool. Verify that the "power" indicator on the communication adapter is illuminated. B. Click the "Utilities" menu. C. Click the "Comm Adapter III Toolkit" menu. D. Wait for the tool kit to open. Then, click the "Utilities" menu. E. Click "Reprogram CA3". F. Select the latest ".apf" file from the list. G. Click "OK". Then, click "Begin Flash". H. Wait for the "Flashes Completed Successfully" message to appear. I. Click "Toolkit". Verify that the "Software Release Version" is "1.18.47" or higher. J. Attempt to connect the electronic service tool.	Firmware	Result: The electronic service tool communicates on both data links. The problem is resolved. Result: The electronic service tool does not communicate on both data links. Proceed to Test Step 4.
4. Check that the Electronic Service Tool is Configured Correctly The electronic service tool must be configured correctly to communicate on both data links. A. Click the "Utilities" menu. B. Click the "Preferences" menu. C. Select the "Communications" tab. D. Verify that "Caterpillar Comm Adapter III (RP120)" is selected. If "Caterpillar Comm Adapter III (RP120)" is not an option for selection, the version of the electronic service tool is incorrect. Version "2013B" or higher must be used. Update the version of the electronic service tool and then perform this Test Step again. E. Verify that the port is correct. F. Verify that the "Enable Dual Data Link Service" option is checked. G. Click "OK". The electronic service tool must reconnect in order for any changes to be used. H. If changes are made to any of the settings for communications, electronically disconnect the electronic service tool . Electronically connect the electronic service tool. Attempt to establish communication. Observe the indicators on the communication adapter. A "limited support" warning should not be displayed. The "J1939 / DeviceNet" and "CDL" indicators should be flashing. The indicator indicates that the electronic service tool is communicating on both data links.	Configured Correctly	Result: The electronic service tool communicates on both data links. The problem is resolved. Result: The electronic service tool does not communicate on both data links. The "POWER" indicator is not illuminated. Proceed to Test Step 5. Result: The electronic service tool does not communicate on both data links. The "POWER" indicator is illuminated. Proceed to Test Step 6.

Illustration 1	g02061279
Power terminals at the service tool connector (Terminal A) +Battery (Terminal B) −Battery

Table 2

Troubleshooting Test Steps	Values	Results
5. Check the Electrical Power to the Communication Adapter A. Check for battery voltage at the diagnostic connector.	Electrical Power	Result: Battery voltage is not present at the diagnostic connector. Repair: Inspect the vehicles wiring and fuses. Determine the cause of the missing voltage. Make the necessary repairs. Attempt to establish communication after the electrical power is at the service tool connector. If the service tool does not communicate on both data links, proceed to Test Step 6. Result: The electronic service tool indicates that the engine is serviced on both links. Repair: Verify that the cable between the diagnostic connector and the communication adapter is OK. If necessary, replace the cable. Repair: Replace the communication adapter if the following conditions are true: 1. There is power at the cables "DATA LINK" connector. 2. The communication adapters "POWER" indicator is not illuminated.
6. Check the Electrical Power to the ECM A. Verify that the keyswitch is ON. B. Check the voltage between the "Battery+" terminals and the "Battery-" terminals on the P1 ECM connector. C. Check the voltage between the "Keyswitch" terminal and a "Battery-" terminal on the P1 ECM connector.	Electrical Power	Result: Battery voltage is missing from a P1 terminal. Repair: Inspect the vehicles wiring and fuses. Determine the cause of the missing voltage. Make the necessary repairs. Attempt to establish communication after the electrical power is at all the appropriate P1 terminals. Continue with this procedure, if necessary. Result: Battery voltage is present at all the appropriate P1 terminals. Contact the Dealer Solutions Network (DSN).