Landfill Compactors, Soil Compactors, Wheel Dozers, and Wheel Loaders VIMSTM 3G Caterpillar

Electronic Service Tool Does Not Communicate

Usage:

826K 232

Cat^® Electronic Technician (Cat ET) communicates with an electronic control module (ECM) on the CAN data links.

The following indicates 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.

If Cat ET cannot communicate on data links, Cat ET displays a message. The following conditions can cause a communication problem:

Communication adapter incorrect
Wireless communications adapter used
Use of a parallel cable between the communication adapter and the PC
Cat ET version Incorrect
Communication adapter firmware incorrect
Cat ET configuration incorrect
Communication adapter electrical power problem
ECM electrical power problem
Data link wiring problem
Harness problem between the PC and the vehicle

Use this procedure to solve communication problems between Cat ET and an ECM.

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Table 1
Troubleshooting Test Steps	Values	Results
1. Determine the Problem A. If Cat ET is not communicating and the "POWER" indicator is not illuminated, cycle the power to the communications adapter.	Multiple results possible	Both indicators on the communication adapter are not flashing. Go to Step 2. Cat ET indicates the engine must be serviced on two both links. Go to Step 2. Cat ET displays a message that indicates the firmware in the communication adapter does not support communication on data links. Go to Step 3. Cat ET displays a "Error #142 The interface hardware is not responding" message. Go to Step 3. Cat ET displays a message that indicates that Cat ET cannot find an exact match for the software version in the ECM. Update Cat ET to the latest available version. The power indicator is not illuminated. Go to 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 data links: - Wireless communication adapter - 7X-1701 Communication Adapter As B. Identify the communication adapter that is being used.	Communication adapter is correct	OK - A correct communication adapter is being used. However, the "Power" indicator is not illuminated. Go to Step 5. The "Power" indicator is illuminated. Go to Step 4. Not OK - An incorrect communication adapter is being used. Repair: Obtain the correct communication adapter. See Troubleshooting, "Service Tools", if necessary. Establish communication on data links. Continue with this procedure if the communication adapter does not communicate on data links.

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Table 2
3. Check the Communication Adapter Firmware Version Note: The communication adapter firmware version must be "3.0.0" or higher. A. Disconnect Cat ET and 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.	Cat ET communicates on data links	OK - Cat ET communicates on data links. Not OK - Cat ET does not communicate using data links. Go to Step 4.

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Table 3
4. Verify Cat ET Is Configured Correctly Cat ET must be configured correctly to communicate on data links. Perform the following procedure: A. Select the "Utilities" drop-down menu. B. Click on the "Preferences" menu. C. Select the "Communications" 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 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 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" indicators should be flashing. If these indicators are flashing, Cat ET is communicating on data links.	Cat ET communicates on data links	OK - Cat ET communicates on data links. Not OK - Cat ET does not communicate on data links. The "POWER" indicator is not illuminated. Go to Step 5. Not OK - Cat ET does not communicate on data links. The "POWER" indicator is illuminated. Go to Step 6.

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Illustration 1	g01430920
Service tool connector power terminals (Terminal A) +Battery (Terminal B) −Battery

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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. See Illustration 1.	Battery voltage is present	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 exist: There is power at the harness connector for the communication adapter. - The communication adapter's "POWER" indicator is not illuminated. STOP Not OK - 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. Go to Step 6 if the service tool will not communicate on data links.

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Illustration 2	g01431084
Typical ECM power supply connector circuit (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

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Table 5
Troubleshooting Test Steps	Values	Results
6. Check the Electrical Power to the ECM A. Verify the application electrical power is on. B. 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 when the keyswitch circuit is powered.	Battery voltage is present at all appropriate terminals	OK - Battery voltage is present at all of the appropriate terminals. The circuits for the battery power to the ECM are OK. Go to Step 7. 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. Go to Step 7 if necessary.
7. 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 data links. B. Establish communication.	Communication exists	OK - Cat ET communicates on 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. STOP