Inside the 1st gen Civic MDM

[retepsnikrep]

Just looking inside one of these and the igbt is a 600v 300A device. IPM Seems to have a lot more gubins built into the actual igbt device rather than like in the Insight MDM where igbt driver package is in a seperate tin box.

The filter caps are 400V 470uf x 3

So igbt and caps are a bit higher rated than the insight 300A V 250A for the igbt and 400V V 350V for the caps.

The Civic combined MCM & BCM has two H538 chips in it clearly marked B & M. I have it powered on the bench and am looking around the board at the various signals. Need a smaller probe for my osciloscope!

Can someone confirm if the first gen civic is CAN bus or ODBII comms?

[retepsnikrep]

I now have a full set of paper manuals for the first gen CIVIC hybrid and looking though it there are two nice data lines from the MCM to the ECM. One is sending from ECM to MCM other is sending from MCM to ECM. I have a bare Civic MCM running on the bench and hooking it up I captured the following data with my logic analyser of the MCM sending out data Look familiar

Simple TTL serial 9600,8,E,1 format with three different data packets all eight bytes long inc (packet type byte and checksum)

This is data without any battery or MDM etc connected to the mcm, but it shows the data structure which will almost certainly be identical from ECM to MCM. there are no dedicated IMA control lines like with the insight MAMODE1,2,CMDPWR etc it's all done with these serial signals. So if someone was to capture data live from a civic with a bit of effort I think we could develop an IMA Control system.

Is there any market/interest in a MIMA for MK1 Civic hybrid? How many are there? How best to interest/reach Civic owners?

The data may contain battery info as well of course so we might be able to develop a gauge as well.

Data is captured with Saleae Logic 1.1.8

www.solarvan.co.uk/Civic/CIVICLogicdata.zip

I need a 2002-2005 CIVIC ECM now so i can get both working on the bench taking to each other. Anyone want to donate and send me one?

[retepsnikrep]

Noted today there is another serial data line from MCM > ECM and looking at that data MCM is sending, it is a single byte every half second. Interesting

I've started on the software to intercept the ECM > MCM data for analysis, and am now looking for a volunteer to gather data. Anyone with a 2003-2005 civic or access to one want to help? It may be possible to use a modified BCM gauge (different software loaded) to gather data from a civic I can send one free to someone who may be able to help

If I can eventually control a civic motor I might use this as the drive for my EV as it is a more compact unit, simpler to send serial control data, the components in the civic MDM are slightly higher rated and I have a couple of civic MDM's spare.

Edit

Does anyone have access to the advanced diagnostic info for the 2003-2005 civic? Can they upload it anywhere or give me a link? O2INSIGHT can you help? Thanks

[retepsnikrep]

I knocked up a dedicated Civic serial capture gizmo based on the trusty 12F683 which does the hard work, listening to the CIVIC ECM <> MCM serial data lines. It does checksum etc on packets then squirts out a serial stream to the trusty serial to usb lead and straight into excel on the fly. The two buttons enable me to signify when events have occured as data is streaming, this enables things to be narrowed down when something happens. e.g. SOC has incremented/decremented by one bar, assist or regen is active etc etc etc.

Using my CIVIC mdm on bench I've already established three parameters

Temp Byte Range appears to be 0 to 58C
Error Code Byte
PTC Error Byte

I desperately need access to a 2003-2005 civic hybrid to capture live data, pref in UK, but i will consider the US, anyone know someone with one. Looks like an IMAC&C type system with BCM Gauge function may well be possible with a bit more research. Sweetener for any prospective volunteer is a free kit when it's finished.

A kind volunteer on here is also getting me the advanced diagnostic data which is excellent. Thanks.

If there is no interest in this project on here I'll move it to a dedicated civic forum. I don't want to waste peoples time.

Edit Made a civic BCM fooler to mimic cells taps and powered up the drive unit from my HV variable dc supply. Can't seem to find any bytes in the data stream that relate to voltage yet. May need a live vehicle to track that one down. It may be the voltage is not reported to the ECM. Can't really see any need for it to do so.

[Sonicsteel]

Well, here are some specs for numbers left. I am looking into these and they are quite common according to this website.

HONDA CIVIC EXECUTIVE IMA - How Many Left?

HONDA CIVIC SE EXECUTIVE IMA - How Many Left?

[Sonicsteel]

With regard to reaching Civic owners... I think it may be best creating a Civic forum.

[Sonicsteel]

Hi Peter,

I found this on the web, it may help with your Civic investigations:

IMA Battery Manual & Brochure

Hope in some way that helps.

[fechter]

I could possibly help capture data as I have a 2003 Civic and I'm not afraid to rip into the wiring.
I have the factory manual, and as I recall it states it is a CAN bus.
I have seen the Honda factory scan tool on this car too. I can probably get a screen shot of it that shows what parameters can be measured real time. There may be others not shown on the scan tool software.

I'm thinking there must be a signal from the ECM to the MCM for throttle position that could be spoofed to increase the boost.

I thought the Gen1 Insight used the same guts as a Civic. Not so?

[retepsnikrep]

Originally Posted by fechter

I have the factory manual, and as I recall it states it is a CAN bus.

The ECM has two way comms with the MCM it is def not CAN bus between the modules

The MCM is controlled by the serial signals from ECM. If you had the salea logic tool you could capture the signals from the three wires and have some spare inputs for simple hi/lo switches to signify events have occured. Signals are simple 5v TTL logic ASFAIK.

The relevant wires are MOTA, MOTB & RSCD (RSCD is least important and could be ignored)

If you download the salea software you can look at my initial serial data Just from MCM to ECM posted below

I could send you my capture gizmo to send the data straight to an excel data sheet.

[timny1984]

My HCH would be a perfect candidate for this since it's my winter car. It mostly sits in the garage in the summer and just gets driven once and a while to cycle the pack. To bad I'm one of those mechanical engineers who is not at all knowledgeable about electrical engineering things. I suppose if you tell me what to do i could do it, but Fechter seems to be much better suited for this.

I look forward to hearing how your "research" progresses.

Tim