PIN 3456526 - Caterpillar

Illustration 1 g01448769
This diagnostic code is recorded when the software location code for the Power train ECM does not match the hard wired location codes.The probable cause of this diagnostic code is software. The wrong software has been flashed into the ECM. A short to a ground source in one of the location code circuits in the machine harness could also cause this diagnostic code to activate.Note: Do not change the hard wired location code if you have flashed the incorrect software into the control.Note: For help with verification of correct location codes, in the Cat ET status screen, the "actual" location code and the "desired" location code for each ECM on the machine can be displayed. Test Step 1. VERIFY HARDWARE AND SOFTWARE PART NUMBERS
Verify whether the part number of the software for the ECM is correct.Expected Result:Contact the Business Unit that is producing the product for the correct configuration for the machine.Results:
OK - All part numbers are correct for the ECM. Proceed to Test Step 2.
NOT OK - All part numbers are NOT correct. The installed ECM has the wrong part number or incorrect configuration software is installed.Repair: Replace the ECM with a module that has the correct part number or flash the correct configuration software. See Testing and Adjusting, "Electronic Control Module - Flash Program".STOPTest Step 2. VERIFY WHETHER THE LOCATION CODE MATCHES THE ET STATUS SCREEN
Check the ET status screen in order to verify the location code. The codes are listed below: Power Train ECM ... 4Expected Result:The location codes in the ET are correct.Results:
OK - The location codes in the ET are correct. Proceed to Test Step 3.
NOT OK - The location codes are NOT correct. Repair: Repeat this test step in order to verify that the software and hardware part numbers are correct. Proceed to Test Step 3 if the part numbers are correct.Test Step 3. INSPECT HARNESS CONNECTIONS
Turn the key start switch and the disconnect switch to the OFF position.
Inspect the harness connections that are related to the location codes. Make sure that the connectors are clean. Make sure that the connectors are tight.
Check for the proper mating of the connector.
Check all wires at the connector.
Check each wire for nicks. Check each wire for signs of abrasion in the insulation.
Check for moisture at the connector.
Check for dirty contacts or corroded contacts.
Check each pin and check each socket.Expected Result:The machine harness connectors are tight and the machine harness connectors are free of corrosion.Results:
OK - The machine harness connectors are tight and the machine harness connectors are free from corrosion. Proceed to Test Step 4.
NOT OK - One or more of the machine harness connectors are in need of repair.Repair: Repair the connector and verify that all connections are correct before reconnecting to the mating connector. After the connector is repaired, verify that the problem has been corrected before operating the machine.STOPTest Step 4. CHECK FOR A SHORT TO GROUND
The disconnect switch and the key start switch remain in the OFF position.
Disconnect the machine