BOLT 4828427 - Caterpillar

Illustration 1 g02548140
Data-link schematic
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 directly. The VIMS 3G Main ECM cannot communicate with the Implement ECM or the Implement ECM communicates intermittently.Test Step 1. VERIFY 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 product business unit for the correct 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 software. See Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".STOPTest Step 2. INSPECT THE HARNESS
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 passes inspection.Results:
OK - The harness passes inspection. Proceed to Test Step 3.
NOT OK - The harness does not pass inspection.Repair: Repair or replace the harness. STOPTest Step 3. CHECK FOR SHORTS TO GROUNDThe 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(Green)) and 9 (wire 892-BR(Brown)) 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 resistance is less than 5000 ohms. There is a short between frame ground and the Cat data-link circuit.Repair: Repair or replace the harness. STOPTest Step 4. CHECK FOR SHORT TO +BATTERYThe disconnect switch remains off and all related ECMs remain disconnected.
At the Implement ECM harness connector, perform the following checks:
Measure the resistance between the +Battery connector contact J1-31 (wire 170-RD(Red)) and connector contact J1-10 (wire 893-GN(Green)).
Measure the resistance between connector contact J1-31 (wire 170-RD(Red)) and connector contact J1-20 (wire 892-BR(Brown)). Expected Result:The resistance is greater than 5000 ohms. Results:
OK - The resistance is greater than 5000 ohms. Proceed to Test Step 5.
NOT OK - The resistance is less than 5000 ohms. There is a short between the +battery and the Cat data-link circuit.Repair: Repair or replace the harness. STOPTest Step 5. CHECK FOR OPEN HARNESSThe disconnect switch remains off and all related ECMs remain disconnected.
Check the continuity of the Cat data-link circuit in the harness:
Measure the resistance