BRACKET 6N4682 - Caterpillar

Use this procedure to troubleshoot the electrical system if a problem is suspected with the Electronic Control Module (ECM).
Table 1
Code and Description Conditions which Generate this Code System Response
252-12 Calibration Module : Failure 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 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 The ECM has detected an internal fault with the ECM memory, the microprocessor, or the power supply. The CID-FMI may be viewed on display modules or an electronic service tool. The fault is logged in the ECM memory. The ECM will reset. The ECM cannot communicate with an electronic service tool. Recommended Actions
Table 2
Troubleshooting Test Steps Value Results
1. Inspect the Electrical Connectors and the Wiring Harness.
A. Remove electrical power from the ECM.
B. Inspect connector P17/J17. Inspect the ECM connector J1/P1. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
C. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
D. Check the allen head screw on the ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Electrical connectors and wiring
Result : The electrical connectors and/or wiring is OK.
Proceed to Test Step 2.
Result : The electrical connectors and/or wiring is NOT OK.
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.
If the problem is not resolved, proceed to Test Step 2.
2. Check The ECM Personality Module.
A. Turn the engine control switch to the OFF position.
B. Remove the personality module access cover.
C. Remove the personality module. Refer to Troubleshooting, "ECM Software - Install" for details.
D. Inspect the personality module for physical damage or corrosion.
E. Inspect the personality module socket inside the ECM for physical damage or corrosion.
F. Reinstall the personality module.
ECM personality module
Result : The ECM personality module is OK.
Proceed to Test Step 3.
Result : The ECM personality module is NOT OK.
Repair : If necessary, repair the personality module. Refer to Troubleshooting, "Electrical Connectors - Inspect" for more information.
If the problem is not resolved, proceed to Test Step 3.
3. Check the Part Number of the Personality Module.
A. Connect an Cat Electronic Technician to the service tool connector.
B. Turn the engine control switch to the ON position.
C. Use Cat ET to verify that the personality module part number agrees with the original engine arrangement.
Personality module
Result : The personality module part number is OK.
Proceed to Test Step 4.
Result : The personality module part number is NOT OK.
Repair : Install the correct personality module.
Result : Cat ET does not communicate with the ECM.
Repair : Check the power supply to