GUARD AS 1084022 - Caterpillar

Illustration 1 g01382141
Schematic of the Cat Data LinkThis diagnostic trouble code is recorded when the Cat Data Link is not communicating correctly. For example, actual gear information is not received from other electronic control modules through the Cat Data Link. This diagnostic trouble code causes the readouts, that are dependent upon the Cat Data Link information, to indicate abnormal values.
Poor electrical connection at a machine harness connector
The circuit for the Cat Data Link in the machine harness is shorted to ground.
The circuit for the Cat Data Link in the machine harness is shorted to the +battery.
The circuit for the Cat Data Link in the machine harness is open.Test Step 1. CHECK FOR OTHER DIAGNOSTIC TROUBLE CODES.
Check for other diagnostic trouble codes that are related to the Cat Data Link.Expected Result:There are other diagnostic trouble codes that are showing.Results:
YES - Exit this procedure and perform the other procedures for the diagnostic trouble codes that are shown.STOP
NO - There are not any other diagnostic trouble codes that are shown. Proceed to Test Step 2.Test Step 2. INSPECT THE HARNESS CONNECTORS.
Turn the disconnect switch to the OFF position.
Inspect the connections for the machine harness that are related to the Cat Data Link.
Make sure that connectors are clean and tight.Expected Result:The machine harness is correct.Results:
OK - The machine harness is correct. Proceed to Test Step 3.
NOT OK - The machine harness is not correct.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK FOR A SHORT TO GROUND.
The disconnect switch remains in the OFF position.
Disconnect the machine harness from all of the electronic control units that use the Cat Data Link.
At the machine harness connector for the ECU, measure the resistance between frame ground and wire 893-GN and wire 892-BR of the Cat Data Link.Expected Result:The resistance is greater than 5000 ohms.Results:
YES - The resistance is greater than 5000 ohms. The harness circuit resistance is correct. Proceed to test step 4.
NO - The resistance is less than 5000 ohms. The machine harness has failed. There is a short between the frame ground and the Cat Data Link circuit in the machine harness. Repair: Repair the machine harness or replace the machine harness.STOPTest Step 4. CHECK FOR A SHORT TO THE +BATTERY.
The disconnect switch remains OFF.
All related control modules remain disconnected