Introduction to ECU level diagnostic

AN3044

6/20

Doc ID 16196 Rev 2

1

Introduction to ECU level diagnostic

ECU level diagnostic in the field has 2 important goals:

●

Collect traceability information of the ECU configuration

●

Run ECU level self tests

The additional difficulty for ECU level diagnostic is access to the PCB as in most of cases,

the PCB is hidden inside the ECU housing; the application note will propose different

possibilities, for ECU level (i.e.: with housing) and PCB level (i.e.: without housing).

1.1

ECU level traceability information

ECU level traceability involves several data:

●

Hardware configuration information: hardware revision number, traceability information

of the key components of the ECU

●

Software configuration information: software revision number of each top level software

component

In addition to this, date code of hardware or software components is also sometimes

collected.

1.2

ECU level self tests

When an ECU is suspected of wrong behavior, it is required to be able to run ECU level

diagnostic to confirm or not the suspicion.