C27 and C32 Engines for Caterpillar Built Machines Caterpillar

Use this procedure to solve communication problems between the Caterpillar Electronic Technician (ET) and the engine control module (ECM). Cat ET must communicate with the ECM on the "Cat Data Link" and on the J1939 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 J1939 data link. The "J1708" indicator indicates that the communication adapter is communicating on the "Cat Data Link". Cat ET displays a message during the connection if Cat ET cannot communicate on both data links.

The following conditions can cause a communication problem:

• Incorrect communication 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. Determine the communication problem. If an indicator other than the "POWER" indicator is illuminated when Cat ET 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: Cat ET indicates that the engine is serviced on both links. Proceed to Test Step 2. Result: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. Result: Cat ET displays an Error" #142 The interface hardware is not responding" message. Proceed to Test Step 3. Result: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. 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 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. 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 "3.0.0" or higher. A. Electronically disconnect Cat ET. Verify that the "power" indicator on the communication adapter is illuminated. B. Click on the "Utilities" menu. C. Click on the "Comm Adapter II Toolkit" menu. D. Wait for the tool kit to open. Then, click the "Utilities" menu. E. Click "Application Firmware Flash". 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 "Application Firmware Version (Serial IP)" is "3.0.0" or higher. J. Attempt to connect Cat ET.	Firmware	Result: Cat ET communicates on both data links. The problem is resolved. Result: Cat ET does not communicate on both data links. Proceed to Test Step 4.
4. Verify That Cat ET is Configured Correctly Cat ET must be configured correctly in order to communicate on both data links. A. Click on the "Utilities" menu. B. Click on the "Preferences" menu. C. Select the "Communications" tab. D. Verify that "Caterpillar Communication Adapter II (Serial IP)" is selected. If "Caterpillar Communication Adapter II (Serial IP)" is not an option for selection, the version of Cat ET is incorrect. Version "2007B" or higher must be used. 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". Cat ET must reconnect in order for any changes to be used. H. Electronically disconnect Cat ET if changes are 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 "CDL" indicators should be flashing. The indicator indicates that Cat ET is communicating on both data links.	Configuration	Result: Cat ET communicates on both data links. The problem is resolved. Result: Cat ET does not communicate on both data links. The "POWER" indicator is not illuminated. Proceed to Test Step 5. Result: Cat ET 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 service tool connector.	Electrical power	Result: Battery voltage is not present at the service tool connector. 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. Proceed to Test Step 6 if the service tool does not communicate on both data links. Result: Cat ET indicates that the engine is serviced on both links. 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: 1. There is power at the cables "DATA LINK" connector. 2. The communication adapters "POWER" indicator is not illuminated.

Illustration 2	g02061196
General information about the electrical power to the ECM

Table 3

Troubleshooting Test Steps	Values	Results
6. Check the Electrical Power to the ECM A. Verify that the keyswitch is ON. B. Refer to Illustration 2. Verify that battery voltage is present at the terminals that are indicated in the Illustration. Be sure to connect the voltmeter between the "UNSWITCHED +BATTERY" terminals and the "-BATTERY" terminals. C. Verify that battery voltage is present at P1-70.	Electrical Power	Result: Battery voltage is missing from a P1 terminal. 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 of the appropriate P1 terminals. Continue with this procedure, if necessary. Result: Battery voltage is present at all of the appropriate P1 terminals. Proceed to the Test Step 7
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) and a 328-2292 Harness (ELECTRONIC CONTROL MODULE). The harnesses support communication on both data links. B. Attempt to establish communication.	Harness	Result: Cat ET communicates on both data links when the bypass harness is used. There is a problem with the wiring. Repair the data link. Refer to Troubleshooting, "Data Link - Test".