GUARD GP-CRANKCASE 8W8485 - Caterpillar

Illustration 1 g02301835
Schematic for the Cat Data LinkThis diagnostic code is recorded when the Rear Transmission ECM (scraper) does not receive expected information from the Tractor Transmission/Chassis ECM for more than five seconds.System Response:This failure results in events that are logged against an ECM that cannot be explained directly. The Rear Transmission ECM (scraper) cannot communicate with this ECM or the ECM appears to communicate intermittently. Prior to performing this procedure, check for an active diagnostic code of CID 0248 FMI 09. If this diagnostic code is present exit this procedure and perform the diagnostic procedure for CID 0248 FMI 09.Test Step 1. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS.
Verify that the following information is correct:
The part number of the Tractor flash software
The part number of the Tractor Transmission/Chassis ECM
The part number of the Scraper flash software
The part number of the Rear Transmission ECM (scraper)Note: Consult the Business Unit that produces the product for the correct part numbers of the flash software.Expected Result:All the part numbers are correct.Results:
OK - All the part numbers are correct. Proceed to Test Step 2.
NOT OK - All the part numbers are NOT correct. Repair: The installed Rear Transmission ECM (scraper) has the wrong part number or the incorrect software is installed. Replace the incorrect Rear Transmission ECM (scraper) with a module that has the correct part number. Flash the correct software. See the Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program" section of this manual.STOPTest Step 2. INSPECT THE HARNESS CONNECTIONS.
Turn the disconnect switch to the OFF position.
Inspect all harness connections that are related to the Cat Data Link. Make sure that the connectors are clean and tight.
Check the connectors for proper mating. Ensure that all the seals are present and in place.
Check the harness for signs of damage or abrasion.
Check the wires at the connector. Ensure that the wires are secured tightly into the connector. Take care not to pull the wire out of the connector.
Check the exposed wires at the connectors for nicks or signs of abrasion.
Check for moisture inside the connector.
Check the connectors for dirty contacts or corroded contacts.
Check each pin and each socket of the machine harness connectors. Ensure that the contacts are properly installed. The contacts should mate correctly when the two pieces of the connector are placed together. Expected Result:The machine harness connectors are tight and free of corrosion. Results:
OK - The machine harness connectors are tight and free of corrosion. Proceed to Test Step 3.
NOT OK - The machine harness connectors are in need of repair.Repair: Repair the machine harness or replace the machine harness. STOPTest Step 3. CHECK FOR SHORTS TO GROUND.
The disconnect switch remains in the OFF position.
Disconnect the machine harness from all electronic control modules that use the Cat Data Link.
At the machine harness for the Rear Transmission ECM (scraper), measure the resistance between contacts J1-7 (wire 892-BR) and J1-8 (wire 893-GN) of the Cat Data Link and all other contacts of the J1 and J2 connectors and frame