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Table 1
Diagnostic Codes Table    
Code and Description     Conditions which Generate this Code     System Response    
253-2 Personality Module erratic, intermittent, or incorrect     The flash file is for a different engine family or for a different engine application.
There may be a problem with the configuration parameters.     The engine will not start. Clearing this diagnostic code requires factory passwords. The personality module code must be reset to zero.    
254-12 Electronic Control Module Error     The ECM is not responding correctly.     The code is logged.    
268-2 Programmed Parameter Fault erratic, intermittent, or incorrect     The engine Electronic Control Module (ECM) detects that one or more of the programmable parameters have not been programmed.     The code is active only.    The ECM is the computer that controls the engine. The personality module chip contains the ECM software that controls the operation of the computer (ECM). The flash file is a software file that is downloaded into ECM memory (personality module chip) in order to program the ECM for a specific engine application. Flash programming is the preferred method for updating the software. This procedure eliminates the need to remove the personality module from the ECM. This procedure also decreases the risk of moisture entry into the ECM due to improper seal installation.Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove electrical power from the ECM.
Illustration 1 g01139425
ECM (1) J1/P1 connectors (2) J2/P2 connectors
Thoroughly inspect connectors (1) and (2). Also inspect the battery connections. 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 for the air shutoff system.
Check the allen head screw on the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque value.
Check the harnesses and the wiring for abrasion and for pinch points.Expected Result:All connectors, pins, and sockets are coupled and/or inserted and the harnesses and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harnesses and the connectors are OK. Proceed to Test Step 2.
Not OK - The wiring and/or a connector are not OK.Repair: Repair the wiring and/or the connectors. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are coupled. Verify that the repair eliminates the problem.STOPTest Step 2. Check for Diagnostic Codes
Restore electrical power to the ECM.
Use Caterpillar Electronic Technician (ET) to check for active diagnostic codes. Observe the "Active Diagnostic" screen on Cat ET. Wait at least 30 seconds so that any codes may become active. Look for these codes:
253-2
254-12
268-2
Verify the integrity of engines configuration parameters.Expected Result:No codes are active. The integrity of the configuration parameters is intact.Results:
OK - No codes are active. The integrity of the configuration parameters is intact.Repair: If an intermittent condition is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - A 253-2 diagnostic code is active. Proceed to Test Step 3.
254-12 Present - If an internal problem develops, the diagnostic code 254-12 becomes active. This indicates that the ECM has detected an internal problem that cannot be fixed.Repair: Replace the ECM. Ensure that the new ECM serial number has a CD at the end. Refer to the diagnostic procedure Troubleshooting, "Replacing the ECM".STOP
268-02 Present - Repair: Reprogram the system configuration parameters. Refer to the diagnostic procedure Troubleshooting, "Programming Parameters".STOPTest Step 3. Review the Parameters and Data
Restore the electrical power to the ECM.
Use Cat ET to review the system configuration parameters and the engine lifetime totals.Expected Result:The parameters and totals are correct.Results:
OK - The parameters and totals are correct.Repair: The engine will not start until the 253-2 diagnostic code is cleared.Use Cat ET to obtain the factory passwords that are needed to reset the personality module code to zero. Refer to Troubleshooting, "Factory Passwords". Clear the 253-2 diagnostic code.If an intermittent condition is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - The parameters and/or the totals are incorrect.Repair: Program the suspect parameters and/or the engine lifetime totals. Refer to Troubleshooting, "Configuration Parameters".If the ECM will not accept the programming, replace the ECM. Refer to Troubleshooting, "ECM - Replace". Verify that the repair eliminates the problem.STOP