844K and 854K Wheel Dozers and 990K, 992K, 993K, 994F and 994H Wheel Loaders Powered Access Stairway Caterpillar

Illustration 1	g01500713
Schematic of the Cat data Link

This diagnostic code is recorded when the Implement ECM can not communicate properly with the Power Train ECM. The Implement ECM and the Power Train ECM communicate via the CAT data link.

The possible causes for this diagnostic code are listed below:

• The correct software is not installed in the Implement ECM.

• The correct software is not installed in the Power Train ECM.

• The correct hardware is not installed in the Implement ECM.

• The correct hardware is not installed in the Power Train ECM.

System Response:

The machine response is listed:

• Implements may not be locked out when the engine is being started.

Note: Ensure that the diagnostic code indicator is active and that the diagnostic code is active.

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

1. Verify that the following information is correct:

   • The part number of the flash software for the Implement ECM

   • The part number of the flash software for the Power Train ECM

   • The part number of the Implement ECM

   • The part number of the Power Train ECM

   Note: Consult your Caterpillar dealer for the correct part numbers of the flash software.

Expected Result:

All of the part numbers are correct.

Results:

• OK - All of the part numbers are correct. The CID 0296 FMI 12 diagnostic code is active. The problem has not been corrected. The software for the ECM may be corrupted.

  Repair: Reflash the ECM with the correct software. See the Testing and Adjusting, "Electronic Control Module (ECM) - Flash Programming" section for additional information.

  STOP

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

  Repair: The installed Implement ECM or the Power Train ECM have the wrong part number or the incorrect flash software is installed. Replace the incorrect Implement ECM or the Power Train ECM with a module that has the correct part number. Flash the correct software. See the Testing and Adjusting, "Electronic Control Module (ECM) - Flash Programming" section for additional information.

  STOP