938G Wheel Loader, 938G Series II Wheel Loader, IT38G Integrated Toolcarrier and IT38G Series II Integrated Toolcarrier Traction Control System MID 028 - CID 0296 - FMI 09 Caterpillar

Conditions Which Generate This Code:

This diagnostic code is recorded when the traction control ECM does not receive expected information from the transmission ECM for a period of more than 5 seconds.

System Response:

This failure results in events that are logged against an ECM that can not be explained directly. The traction control ECM cannot communicate with this ECM or the ECM appears to communicate intermittently. Prior to performing this procedure, check for an active diagnostic code of CID 0248 FMI 09. If this diagnostic code is present exit this procedure and perform the diagnostic procedure for CID 0248 FMI 09.

Test Step 1. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS.

1. Verify that the following information is correct:
   • The part number of the transmission's flash software

   • The part number of the transmission ECM

   • The part number of the traction control's flash software

   • The part number of the traction control ECM

   Note: Consult the Business Unit that produces the product for the correct part numbers of the flash software.

Expected Result:

All the part numbers are correct.

Results:

• OK - All the part numbers are correct. Proceed to Test Step 2.

• NOT OK - All the part numbers are NOT correct.

  Repair: The installed ECM has the wrong part number or the incorrect software is installed. Replace the incorrect ECM with a module that has the correct part number. Flash the correct software. See the Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program" section of this manual.

  Stop.

Test Step 2. INSPECT THE HARNESS CONNECTIONS.

1. Turn the key start switch and the disconnect switch to the OFF position.

2. Inspect all harness connections that are related to the AVS data link. Make sure that the connectors are clean and tight.

3. Check the connectors for proper mating. Ensure that all the seals are present and in place.

4. Check the harness for signs of damage or abrasion.

5. Check the wires at the connector. Ensure that the wires are secured tightly into the connector. Take care not to pull the wire out of the connector.

6. Check the exposed wires at the connectors for nicks or signs of abrasion.

7. Check for moisture inside the connector.

8. Check the connectors for dirty contacts or corroded contacts.

9. Check each pin and each socket of the machine harness connectors. Ensure that the contacts are properly installed. The contacts should mate correctly when the two pieces of the connector are placed together.

Expected Result:

The machine harness connectors are tight and free of corrosion.

Results:

• OK - The machine harness connectors are tight and free of corrosion. Proceed to Test Step 3.

• NOT OK - The machine harness connectors are in need of repair.

  Repair: Repair the machine harness or replace the machine harness.

  Stop.

Test Step 3. CHECK FOR SHORTS TO GROUND.

1. The key start switch and the disconnect switch remain in the OFF position.

2. Disconnect the machine harness from all electronic control modules that use the AVS data link.

3. At the machine harness connector for the ECM, measure the resistance between frame ground and the AVS data link circuits (contacts J1-3 and J1-9).

Expected Result:

The resistance is greater than 5000 ohms.

Results:

• OK - The resistance is greater than 5000 ohms. The harness circuit resistance is correct. Proceed to Test Step 4.

• NOT OK - The resistance is less than 5000 ohms. There is a short between frame ground and the AVS data link circuit in the machine harness. The machine harness has failed.

  Repair: Repair the machine harness or replace the machine harness.

  Stop.

Test Step 4. CHECK THE MACHINE HARNESS FOR A SHORT TO THE + BATTERY CIRCUIT.

1. The key start switch and the disconnect switch remain in the OFF position.

2. All related electronic control modules remain disconnected from the machine harness.

3. At the traction control ECM, measure the resistance between the contacts J1-9 (wire 944-OR) and J1-3(wire 945-BR) of the AVS data link and the + battery circuit.

Expected Result:

The resistance is greater than 5000 ohms.

Results:

• OK - The harness circuit resistance is correct. Proceed to Test Step 5.

• NOT OK - The resistance is less than 5000 ohms. The machine harness has failed.

  Repair: There is a short between the +battery circuit and the circuits of the AVS data link circuit in the machine harness. Repair the machine harness or replace the machine harness.

  Stop.

Test Step 5. CHECK FOR AN OPEN HARNESS.

1. The disconnect switch remains in the OFF position.

2. All related electronic control modules remain disconnected from the machine harness.

3. Check the continuity of the AVS data link circuit in the machine harness:
   • Measure the resistance between connector contact J1-9 (wire 944-OR) of the traction control ECM and the corresponding contact of the transmission ECM.

   • Measure the resistance between connector contact J1-3 (wire 945-BR) of the traction control ECM to the corresponding contact of the transmission ECM.

Expected Result:

The resistance measures less than 5 ohms.

Results:

• OK - The resistance is less than 5 ohms. The AVS data link circuit in the machine harness is correct. Proceed to Test Step 6.

• NOT OK - The resistance is greater than 5 ohms. The machine harness has failed.

  Repair: The AVS data link circuit is open in the machine harness. Repair the machine harness or replace the machine harness.

  Stop.

Test Step 6. CHECK FOR ADDITIONAL DIAGNOSTIC CODES FOR THE OTHER ELECTRONIC CONTROL MODULES.

1. Turn the key start switch and the disconnect switch to the OFF position.

2. One at a time, reconnect the electronic control modules that use the AVS data link.

3. Turn the disconnect switch and the key start switch to the ON position.

4. After each of the electronic control modules has been reconnected, check the Event List for diagnostic codes that are logged against the electronic control module.

Expected Result:

Diagnostic codes are not present for the other electronic control modules in the event list.

Results:

• OK - Diagnostic codes are not present for the other electronic control modules in the event list. The traction control ECM has failed.

  Repair: It is unlikely that the ECM has failed. Exit this procedure. Perform this procedure again. If the failure is not found, check the + battery contacts and ground contacts of the ECM. If these contacts are correct, replace the ECM.

  Stop.

• NOT OK - Diagnostic codes are present for the other electronic control modules (ECM) in the event list. Exit this procedure and perform the diagnostic procedure for the diagnostic codes that are shown. Stop.