12372-879-000 Honda VALVE, BREATHER (Honda Code 0452151).

Table 1
Diagnostic Codes Table    
Code and Description     Flash Code     Conditions which Generate this Code     System Response    
252-12 Calibration Module : Failure     52     The flash file is for a different engine family or for a different engine application.     The engine will not start. Clearing this diagnostic code requires factory passwords. The personality module code must be reset to zero.    
253-2 Personality Module : Erratic, Intermittent, or Incorrect     56     The code indicates a customer or a system parameter has not been programmed.     The diagnostic code is displayed but not logged.    
254-12
Error of the Electronic Control Module     53     The ECM has detected a internal fault with the ECM memory, the microprocessor or the power supply.     The CID-FMI may be viewed on display modules or a electronic service tool. The fault is logged in the ECM memory. The ECM will reset. The ECM can not communicate with an electronic service tool.    Test Step 1. Inspect the Electrical Connectors and the Wiring Harness
Remove electrical power from the ECM.
Thoroughly inspect connector P17/J17. Inspect the ECM connector J14/P14. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
Check the allen head screw on the ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points. Proceed to Test Step 2.
NOT OK - There is a problem with the connectors and/or the wiring.Repair: Repair the wiring and connectors or replace the wiring or the connectors. Ensure that all of the seals are properly connected. Verify that the repair eliminates the problem.Verify that the repair eliminates the problem.STOPTest Step 2. Check The ECM Personality Module
Turn the engine control switch to the OFF position.
Remove the personality module access cover.
Remove the personality module. Refer to Troubleshooting, "ECM Software - Install" for details.
Inspect the personality module for physical damage or corrosion.
Inspect the personality module socket inside the ECM for physical damage or corrosion.
Reinstall the personality module.Note: Do not use excessive force to insert the personality module. The personality module is keyed and the personality module will only install one way. A click can be felt when the personality module is installed correctly. Make sure that the personality module is completely seated into the socket. Take care to not damage the O-ring during installation. Expected Result:The personality module is free of damage and corrosion. The personality module is firmly seated in the socket.Results:
OK - The personality module is free of damage and corrosion. The personality module is firmly seated in the socket. Proceed to Test Step 3.
NOT OK - The personality module is not free of damage and corrosion or the personality module is not firmly seated in the socket.Repair: If necessary, repair the personality module. Refer to Troubleshooting, "Electrical Connectors - Inspect" for more information.STOPTest Step 3. Check the Part Number of the Personality Module
Connect an Caterpillar Electronic Technician to the service tool connector.
Turn the engine control switch to the ON position.
Use Cat ET to verify that the personality module part number agrees with the original engine arrangement.Note: If a failure has occurred, temporarily install a new part, and thoroughly retest the system.Expected Result:Cat ET communicates with the ECM and the correct personality module is displayed.Results:
OK - Cat ET communicates with the ECM and the correct personality module is displayed. Proceed to Test Step 4.
NOT OK - The Cat ET does not display the correct personality module.Repair: Install the correct personality module.STOP
NOT OK - Cat ET does not communicate with the ECM.Repair: Check the power supply to the ECM. Inspect the service tool connectors and wiring. Refer to Troubleshooting, "Electronic Service Tool Does Not Communicate" for more information.STOPTest Step 4. Review Parameters And Data
Turn the engine control switch to the ON position.
Use Cat ET to review the system configuration parameters and the engine lifetime totals.
Check for active diagnostic event codes and for logged diagnostic event codes.Expected Result:The parameters and totals are correct. Results:
OK - The parameters and totals are correct.Repair: The ECM and the personality module are working correctly.STOP
NOT OK - The parameters and totals are incorrect.Repair: Attempt to reprogram the parameters. If the problem is not resolved, replace the ECM. Refer to Troubleshooting, "ECM - Replace" for more information.STOP