3516B and 3516C Engines For MT4400D AC Off-Highway Trucks 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.

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

Troubleshooting Test Steps	Values	Results
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 the "power" indicator on the communication adapter is illuminated. B. Select the "Utilities" drop-down menu. C. Select "Comm Adapter III Toolkit" from the menu. D. When the dialog box for the tool kit appears, select the "Utilities" drop-down menu. E. Select "Application Firmware Flash" from the menu. F. Select the latest ".apf" file from the list. G. Click "OK". Then, click "Begin Flash". H. When the file is loaded, the "Flash Completed Successfully" message will appear. I. Click "Toolkit". Verify that the "Application Firmware Version (Serial IP)" is "3.0.0" or higher. J. Attempt to connect Cat ET.	Firmware	Results: OK - Cat ET communicates on both data links. Results: Not OK - Cat ET does not communicate using both data links. Proceed to Test Step 4

Table 3

Troubleshooting Test Steps	Values	Results
4. Verify that Cat ET is Configured Correctly Cat ET must be configured correctly in order to communicate on both data links. Perform the following procedure: A. Select the "Utilities" drop-down menu. B. Click on the "Preferences" menu. C. Select the "Commmunications" tab. D. Verify that "Caterpillar Communication Adapter III (Serial IP)" is selected. If "Caterpillar Communication Adapter III (Serial IP)" is not an option for selection, the version of Cat ET is incorrect. Ensure that version "2007B" has been installed. If necessary, update the version of Cat ET. 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". Note: Cat ET must reconnect in order for any changes to be recognized. H. Electronically disconnect Cat ET if changes were made to any of the settings for communications. Electronically connect Cat ET. Attempt to establish communication. Observe the indicators on the communication adapter. A "limited support" warning should not be displayed. The "J1939 / DeviceNet" and "Cat Data Link" indicators should be flashing. If these indicators are flashing, Cat ET is communicating on both data links.	Verify that Cat ET is Configured Correctly	Results: OK - Cat ET communicates on both data links. Results: Not OK - Cat ET does not communicate on both data links. The "POWER" indicator is not illuminated. Proceed to Test Step 5 Results: No - Cat ET does not communicate on both data links. The "POWER" indicator is illuminated. Proceed to Test Step 6

Illustration 1	g01430920
Power terminals at the service tool connector (Terminal A) +Battery (Terminal B) -Battery

Table 4

Troubleshooting Test Steps	Values	Results
5. Check the Electrical Power to the Communication Adapter A. Check for battery voltage at the service tool connector. Refer to Illustration 1.	Check the Electrical Power	Results: OK - Battery voltage is present at the service tool connector. Repair: Verify that the cable between the service tool connector and the communication adapter is OK. Replace the cable, if necessary. Replace the communication adapter if the following conditions are true: - There is power at the harness connector for the communication adapter. - The communication adapter's "POWER" indicator is not illuminated. Results: Battery voltage is not present at the service tool connector. Repair: Inspect the application 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. Proceed to Test Step 6 if the service tool will not communicate on both data links.

Illustration 2	g01431084
Terminal locations at the J1/P1 ECM connectors for the ECM power supply circuit (typical wiring) (48) Unswitched +Battery (52) Unswitched +Battery (53) Unswitched +Battery (55) Unswitched +Battery (57) Unswitched +Battery (61) -Battery (63) -Battery (65) -Battery (67) -Battery (69) -Battery (70) Keyswitch circuit

Illustration 3	g01817154
Schematic for the ECM power supply circuit (typical wiring diagram)

Table 5

Troubleshooting Test Steps	Values	Results
6. Check the Electrical Power to the ECM A. Verify that electrical power for the application is turned on. B. Refer to Illustration 2 and Illustration 3. Verify that battery voltage is present at the terminals that are indicated in the Illustration. Be sure to connect the voltmeter between the +Battery terminals and the -Battery terminals at the ECM connector. C. Verify that battery voltage is present at P1-70 when the keyswitch circuit is powered.	Electrical Power to the ECM	Results: OK - Battery voltage is present at all of the appropriate P1 terminals. The circuits for the battery power to the ECM are OK. Proceed to Test Step 7 Results: Not OK - Battery voltage is not present at an ECM battery connection. Repair: Inspect the application wiring, fuses, and/or circuit breakers. Determine the cause of the missing voltage. Make the necessary repairs. Attempt to establish communication after the electrical problem at the ECM has been resolved. Continue with this procedure, if necessary.

Table 6

Troubleshooting Test Steps	Values	Results
7. Try to Establish Communication with a Bypass Harness A. Connect the communication adapter to the engine ECM with a 217-0113 Wiring Harness (ECM BYPASS). This harness supports communication on both data links. B. Attempt to establish communication.	Establish Communication	Results: OK - Cat ET communicates on both data links when the bypass harness is used. There is a problem with the application wiring for one of the data links. Repair: Repair the data link. Refer to Troubleshooting, "Data Link - Test"