3408 & 3412 HIGH PERFORMANCE MARINE ENGINES Caterpillar

P-520 ECM/Personality Module

Usage:

System Operation

The Electronic Control Module (ECM) is the computer which controls the 3408/3412 High Performance Marine Engine. The Personality Module is the software which controls how the computer (ECM) behaves. The two must be used together - neither can do anything by itself.

The Personality Module consists of:

* All of the software, or Instructions for the ECM to do its job. Because of this, updating the Personality Module to a different version may cause some engine functions to behave in a different manner.

* Performance Maps, which define fuel rate, etc. for various operating conditions to achieve optimum performance. These are programmed into the Personality Module at the factory only.

The ECM consists of:

* A microprocessor, to perform the computing necessary to perform the ECM's functions (governing, generating diagnostic codes, communicating with service tools, etc.). The microprocessor gets its instructions from the software in the Personality Module.

* Programmable Parameters, stored in permanent memory (both Customer Specified and System Configuration Parameters). Refer to the section 2.0 Programming Parameters for details on what these parameters do.

* Logged Diagnostics, the ECM logs certain diagnostic codes into memory so that a record is retained. Refer to the section; Troubleshooting Diagnostic Codes, for further information on logged codes.

* Input Circuits, to filter electrical noise from sensor signals and to protect sensitive internal circuits from potentially damaging voltage levels.

* Output Circuits, to provide the high currents necessary to energize lamps or rack as the microprocessor chooses.

* Power circuits, to provide clean, stable electrical power to internal circuits and external sensors.

NOTE: When your troubleshooting indicates that a failure has occurred in the ECM or Personality Module then temporarily install a new part and thoroughly Retest.