5130, 5130B and 5230 Excavators, 784B, 785B, 785C, 789B, 789C, 793B and 793C Off-Highway Truck/Tractors and 992G, 994 and 994D Wheel Loaders Vital Information Management System (VIMS) Caterpillar

This failure may cause the readouts that depend on the information from the CAT data link to display information incorrectly.

1. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS.

   1. Verify that the following information is correct:

      • The part number of the VIMS configuration software

      • The part number of the machine ECM flash software

      • The part number of the VIMS main module

      • The part number of the machine ECM

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

      Expected Result: All part numbers are correct.

      Results:

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

      • NOT OK - All part numbers are NOT correct. The installed VIMS main module or the machine ECM has the wrong part number or the incorrect configuration software is installed. Replace the incorrect VIMS main module or the machine ECM with a module that has the correct part number. Flash the correct configuration software. STOP.

2. INSPECT THE HARNESS CONNECTIONS.

   1. Turn the disconnect switch to the OFF position.

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

   3. Check the connectors for proper mating.

   4. Check the wires at the connector.

   5. Check each wire for nicks or signs of abrasion in the insulation.

   6. Check for moisture at the connector.

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

   8. Check each pin and each socket of the machine harness connectors.

      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 3.

      • NOT OK - The machine harness connectors are in need of repair. Repair the machine harness or replace the machine harness. STOP.

3. CHECK FOR SHORTS TO GROUND

   1. The disconnect switch remains in the OFF position.

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

   3. At the machine harness for the VIMS main module, measure the resistance between frame ground and connector contacts 6 (wire 882-PK(Pink)) and 7 (wire 893-GY(Grey)) of the CAT data link circuit.

      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 4.

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

4. CHECK FOR SHORT TO +BATTERY

   1. The disconnect switch remains in the OFF position.

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

   3. At the machine harness connector for the VIMS main module, perform the checks that are listed here:

      • Measure the resistance between (+battery) connector contact 1 (wire 113-OR(Orange)) and contact 6 (wire 882-PK(Pink)) of the CAT data link circuit connector.

      • Measure the resistance between the contact 1 (wire 113-OR(Orange)) (+battery) and contact 7 (wire 893-GN(Green)) of the CAT data link circuit.

      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 5.

      • NOT OK - The resistance is less than 5000 ohms. The machine harness has failed. There is a short between +battery and the CAT data link circuit in the machine harness. Repair the machine harness or replace the machine harness. STOP.

5. CHECK FOR OPEN HARNESS

   1. The disconnect switch remains in the OFF position.

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

   3. Measure the resistance of the CAT data link circuit in the machine harness:

      • Measure between contact 6 (wire 882-PK(Pink)) of the VIMS main module to the CAT data link circuit of the machine ECM.

      • Measure from connector contact 7 (wire 893-GY(Grey)) of the VIMS main module to the CAT data link circuit of the machine ECM.

      Expected Result: The resistance measures less than 5 Ohms.

      Results:

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

      • NOT OK - The resistance is greater than 5 ohms. The machine harness has failed. the CAT data link circuit is open in the machine harness. Repair the machine harness or replace the machine harness. STOP.

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 CAT 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 Machine control ECM has failed. 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. The VIMS main module has failed. It is unlikely that the ECM has failed. Exit this procedure. Perform this procedure again. If the failure is not found, replace the ECM. See the Testing and Adjusting, "Module - Replace" section of this manual. STOP.