Categories
ECU Diagnostics

ECU Diagnostics – part 14 : Software Framework mbe.py

This is hopefully a reasonably short post about the software framework I’ve developed to help read sensor data from the MBE 9A4 ECU. The software is written in Python 3 and is available here: Caterham-OBD. However, I’m going to talk about using one file only which is mbe.py.  The idea behind mbe.py is to “abstract” […]

Categories
ECU Diagnostics

ECU Diagnostics – part 13.3 : MBE-ISOTP

SUMMARY We now understand the communications protocol used by Easimap (the Windows software supplied by the ECU manufacturer) and can use it to ask the ECU for whatever data the car has to offer. We can then manipulate the responses we get back from the car and format them to make sense to us. TL;DR […]

Categories
ECU Diagnostics

ECU Diagnostics – part 13.2 : OBD-II

The OBD-II diagnostic protocol is well defined and information about it can be found in On-board Diagnostics. It’s a mish-mash of many diffrerent standards, both physical and electrical, that I’ll refer to as OBD-II. There’s also a complete breakdown of the Services and PIDs (see below) that can be found in On-board Diagnostic PIDs. I’ll talk […]

Categories
ECU Diagnostics

ECU Diagnostics – part 13.1 : MBE-Broadcast

The simplest of the three Caterham OBD port diagnostic protocols we know about is what I’ve called MBE-Broadcast. As soon as the car is put into ignition switch position 2, the ECU starts to spit out a this stream of data on the CAN bus. Unlike the OBD-II protocol and the MBE-ISOTP protocol, this a […]

Categories
ECU Diagnostics

ECU Diagnostics – part 13 : Three Diagnostic Protocols in the MBE 9A4 ECU

This one’s just a short post to introduce the next three posts. In our investigations of the MBE 9A4 ECU we’ve found three different diagnostics protocols supported on the OBD port. The following three posts will summarise what we’ve learnt about each protocol and will be updated with new information as it becomes available. 13.1 […]