GUIDE AS 7T1835 - Caterpillar

Illustration 1 g02533896
Cat® data-linkNote: MID 161 is generated by one ECM, this ECM is referred to as the following in various venues:
Communication Gateway 1 ECM
VIMS Main Module, in Caterpillar® Electronic Technician Cat® (ET)
VIMS 3G Main ECM, in this publication This diagnostic code is recorded when the VIMS 3G Main ECM does not receive expected Implement ECM information at the correct update rate. The information is communicated through the Cat® data-link.System Response:This failure results in events that are logged against the Implement ECM that cannot be explained. The VIMS 3G Main ECM cannot communicate with the Implement ECM or the Implement ECM appears to communicate intermittently.Test Step 1. VERIFY THE HARDWARE AND SOFTWARE PART NUMBERS
Verify that the following information is correct:
VIMS 3G Main ECM onboard software part number
Implement ECM flash software part number
VIMS 3G Main ECM part number
Implement ECM part number Note: Consult the business unit that produces the product for the correct configuration software part numbers.Expected Result:All part numbers are correct. Results:
OK - All part numbers are correct. Proceed to Test Step 2.
NOT OK - The VIMS 3G Main ECM or the Implement ECM has the wrong part number or the incorrect configuration software is installed. Repair: Replace the component that has an incorrect part number.See Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Flash the correct configuration software. See Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".STOPTest Step 2. INSPECT THE HARNESS AND CONNECTORS
Turn off the disconnect switch.
Inspect the Cat data-link portion of the harness for the following:
Connections are clean and tight
Connectors mate properly
Seals are in place
Signs of damage
Wires are tight in the connectorNote: Take care not to pull the wire out of the connector.
Check the connectors for the following:
Moisture
Dirty contacts
Corroded contacts
Proper pin installation
Proper matingExpected Result:The harness and connectors pass inspection.Results:
OK - The harness and connectors pass inspection. Proceed to Test Step 3.
NOT OK - The harness or connectors do not pass inspection.Repair: Repair or replace the harness. STOPTest Step 3. CHECK FOR SHORTS TO GROUND The disconnect switch remains off.
Disconnect all ECMs from the Cat data-link.
At the VIMS 3G Main ECM harness, measure the resistance between frame ground and connector contacts 8 (wire 893-GN) and 9 (wire 892-BR) of the Cat data-link circuit. Expected Result:The resistance is greater than 5000 ohms. Results:
OK - The resistance is greater than 5000 ohms. Proceed to Test Step 4.
NOT OK - The