GUARD 7J1389 - Caterpillar

Illustration 1 g01969413
Data link schematic
This diagnostic code is recorded when the VIMSTM 3G Application ECM receives Chassis ECM data at an abnormal update rate. The communication is through the Cat® Data Link.System Response:This failure results in events that are logged against the Chassis ECM that cannot be explained. The VIMS 3G Application ECM cannot communicate with the Chassis ECM or the Chassis ECM appears to communicate intermittently.Test Step 1. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS
Verify that the following information is correct:
VIMS 3G Application ECM software part number
VIMS 3G Application ECM part number
Chassis ECM software part number
Chassis ECM part numberNote: For the correct part numbers, consult the business unit that produces the product.Expected Result:All part numbers are correct.Results:
OK - All part numbers are correct. Proceed to Test Step 2.
NOT OK - All part numbers are not correct.Repair: Replace the incorrect ECM with an ECM that has the correct 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
Turn OFF the disconnect switch.
Inspect Cat Data Link harness for the following:
Inspect the connectors, pins, and sockets for the following:
Cleanliness
Security
Proper mating
Seal condition
Moisture
Corrosion
Inspect the wires at the connector for the following:
Security
Nicks
AbrasionNote: Take care not to pull the wire out of the connector.
Inspect the harness for the following:
Damage
Abrasion
KinksExpected Result:The harness is in good condition.Results:
OK - The harness is in good condition. Proceed to Test Step 3.
NOT OK - The harness is not in good condition.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 Application 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. All related ECMs remain disconnected from the harness.
At the Chassis ECM harness connector, perform the following checks:
Measure the resistance between the +Battery connector contact J1-31 (wire 173-RD(Red)) and connector contact J1-10 (wire 893-GN(Green)).
Measure the resistance between connector contact J1-31 (wire 173-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.Repair: Repair or replace the harness.STOPTest Step 5. CHECK FOR OPEN HARNESSThe disconnect switch remains OFF. All related ECMs remain disconnected from the harness.
Perform the following:
Measure the resistance