3512B Marine Auxiliary Engine Caterpillar

ECM/Personality Module

Usage:

3512 4DR

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 Downloading.

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Illustration 1	g00589030
Personality Module

Test Step 1. Check for Active Codes.

Turn the ECS to the OFF/RESET position.

Connect the CaterpillarElectronic Technician (ET).

Turn the ECS to the ON position. The engine should be off.

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 ends in CD. Perform the diagnostic procedure Troubleshooting, "Replacing the ECM" before replacing the ECM.
Stop.
268-02 Present -
Repair: Reprogram the system configuration parameters. Perform the diagnostic procedure Troubleshooting, "Programming Parameters".
Stop.

Test 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 - The serial number of the ECM ends with a CD. Verify that the correct Personality Module is installed.
Repair: Connect the Cat ET and reprogram the interlock code.
Stop.
Not OK - The serial number of the ECM does not end in a CD.
Repair: Replace the ECM. Ensure that the new ECM serial number ends in CD. Perform the diagnostic procedure Troubleshooting, "Replacing the ECM" before replacing the ECM.
Stop.