ECM Harness Connectors (Engine management system - EDC)

Inputs and Outputs The ECM is connected to sensors fitted to the engine which allow it to monitor engine operating conditions. The ECM processes these signals and decides the actions necessary to maintain optimum engine performance in terms of driveability, fuel efficiency and exhaust emissions. The memory of the ECM is programmed with instructions for how to control the engine, this is known as the strategy. The memory also contains data in the form of maps which the ECM uses as a basis for fuelling and emission control. By comparing the information from the sensors to the data in the maps, the ECM is able to calculate the various output requirements. The ECM contains an adaptive strategy which updates the system when components vary due to production tolerances or ageing

The ECM has an interface of 134 pins via five connectors providing both input information and output control. Not all 134 pins are used.

ECM Harness Connectors

1 2 3

1 9 pin connector (C0603) 2 24 pin connector (C0604) 3 52 pin connector (C0606)

4 5

4 40 pin connector (C0331) 5 9 pin connector (C0332)