RING-RETAINING 0950946 - Caterpillar

System Operation Description:The Electronic Control Module (ECM) is the computer which controls the engine. The Personality Module is the software which controls the computer. The two must be used together.The personality module contains all of the software for the ECM. Updating the personality module to a different version may cause some engine features to behave differently.Control maps are used to define engine operation for various conditions. These maps help the engine to achieve optimum performance. The maps are programmed into the personality module at the factory.The ECM uses FLASH memory. The ECM retains programmed information indefinitely. The reprogramming process is called Flash Programming.
Illustration 1 g00691867
Personality ModuleTest Step 1. Check for "ACTIVE" Diagnostic Codes.
Disconnect the main power.
Start the Caterpillar Electronic Technician (ET).
Connect the Battery power to the ECM.
Connect the main power.
Check for active diagnostic codes.Results:
253-02 Present - Proceed to test step 2.
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 2. Check for a Personality Module Mismatch.
Verify that the correct ECM has been installed.
Check the ECM part number. Check the last two characters of the ECM serial number.Expected Result:The ECM serial number should end with a CD.Results:
OK - Verify that the correct Personality Module is installed.Repair: Connect the Cat ET and reprogram the interlock code.STOP
Not OK - The ECM serial number does not end with a CD.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