PIPE AS 3885769 - Caterpillar

Replacing the Personality Module
The personality module is the software which controls the behavior of the Electronic Control Module (ECM). The personality module contains all of the software for the ECM. When troubleshooting has indicated that the personality module has failed, temporarily mount a new personality module on the side of the engine. Test the engine with the new personality module. If the problem no longer exists, proceed with the following steps.Note: Updating the personality module to a different version may cause some engine functions to behave in a different manner.
Illustration 1 g01622820
Remove the personality module access cover.
Firmly grasp the clips on the old personality module and detach the module from the ECM.
Install the new personality module into the ECM. Make sure that the personality module seats properly into the socket of the ECM.Note: The personality module will only match the keyed socket in one position. A click can be felt when the module is pushed in correctly.
Install the personality module cover. The O-Ring must be seated properly.Note: Improper installation of the O-Ring could result in damage to the module from improper sealing. This will allow moisture to enter the socket.
Start the engine and check for proper operation.Note: Customer parameters and system parameters must be programmed on the initial installation of a new ECM. Program the parameters into the ECM when the ECM is initially energized. Refer to Troubleshooting, "ECM/Personality Module - Test" for troubleshooting procedures.