FILTER & MTG GP-DPF 4420631 - Caterpillar

Illustration 1 g03328612
Schematic for the Cat Data Link
This diagnostic code is recorded when the main display module does not receive expected information. The following example shows a possible diagnostic code. The information from the actual gear status is not being received from other electronic control modules through the Cat Data Link. The information from the Cat Data Link indicates the abnormal values in the readout. The possible causes of this diagnostic code are listed below. The causes are listed in order of probability:
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.Note: An electronic control module which uses the Cat Data Link may have lost power or an electronic control may have failed. This situation is unlikely. If the main display module was recently replaced, see Testing and Adjusting, "Main Display Module Initialization - Adjust". Service Notes: Ensure that the desired diagnostic code (CID and FMI) is on hold. Ensure that the service code indicator shows "SERV CODE".Test Step 1. CHECK FOR OTHER CODES.
Check other electronic control modules for a similar diagnostic code. If a similar diagnostic code is found, exit this test. Perform the corresponding procedures for the other diagnostic codes that are shown. Expected Result:There are other diagnostic codes that are showing.Results:
YES - Exit this procedure and perform the other procedures for the diagnostic codes that are shown.STOP
NO - There are not any other diagnostic 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 OFF.
Disconnect the machine harness from all the electronic control modules that use the Cat Data Link.
At the machine harness connector for the main display module, measure the resistance between frame ground and the Cat Data Link circuits (contacts 5 and 14). Expected Result:The resistance that is measured is less than 5000 ohms.Results:
YES - 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.STOP
NO - The resistance is greater than 5000 ohms. The harness circuit resistance is correct. Proceed to test step 4.Test Step 4. CHECK FOR A SHORT TO THE +BATTERY.
The disconnect switch remains OFF.
All related control modules remain disconnected from the machine harness.
At the machine harness connector for the main display module, measure the