Engine Management System BOSCH Motronic 4.3 System Overview

 Engine Management System BOSCH Motronic 4.3 System Overview

Introduction

This document describes the Motronic M4.3 ECU in detail. It will first describe the hardware and

proceed with a even more detailed description of the software that is running in the ECU so that we can

learn how to tweak and tune the ECU to match the hardware – altered or not – that is on the car better.

Hardware

Overview of the board

The ECU contains a tri-layer printed ciruit board (PCB) which holds a lot of SMD components. The main

component are – logically: Main CPU, Flash program storage, SRAM memory (working memory) and a lot of input/output (I/O).