Steptronics

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Mykel
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Model of Car: MG TF Monogram
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Re: Steptronics

Post by Mykel » Wed Feb 10, 2016 5:14 pm

So, lets start with this …

the correct ECU for all models (MGF/TF, Rover 25/MG ZR and Rover 45/MG ZS would be UHC000320 (without shift interlock) or UHC000330 (with shift interlock). UHC100400 was used on the Rover 45/MG ZS only, is listed as NLA and should be replaced with UHC000320.

In the CVT auto gearbox handbook (English version, which you should have, Philip) it says on page 44:
“All diagnostics of the Em-CVT are carried out vie the EMS. Using TestBook, the EMS can request actions from the GIU and monitor these actions for the correct performance.”

So indeed the communication cannot be established between the TestBook (or PScan) and the GIU but has to be addressed through the ECU. The ECU “talks” to the GIU over a serial protocol, details of which as well as pin outs can be found in the said handbook on pages 39 and following.

Pin 1 on C0932 (TF diagram) going to pin 1 C0673 is correct, this activates shift interlock (“Magnetventil-Schaltverblockung” is German for “solenoid shift interlock”).

The connector C0932 in the ZS diagram is for the KV6 engine only. This version came with the Jatco gearbox as well afaik, so is a completely different setup and can be addressed from PScan directly, as I have successfully tested on our 75 Tourer.

The correct connector for the Em-CVT GIU would be numbered C1639 (diagram “automatic gearbox ECD-3”).
If you have a look at the C1639 connector, pins 17 and 18 are used for the serial communication with the ECU (C0913-75 and -77).
This is the same on the TF, but there it’s C0932-17 and -18 leading to C0159-75 and -77.

Same connectors but different numbers in different car setups. Why MG-Rover got that mixed up like this is probably one of the many Longbridge miracles. :lol: 8-) :roll:
MGTF:
2004 TF 135 in Monogram Spectre, black leather, RHD
MGZR:
2001 ZR 160 in Solar Red, LHD, LPG conv
Classic:
1972 MG Midget MkIII RWA in Blaze Red
MGF Register regional rep for Germany -- germany@mgfregister.org

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Rob Bell
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Re: Steptronics

Post by Rob Bell » Wed Feb 10, 2016 6:16 pm

Mykel wrote:The correct connector for the Em-CVT GIU would be numbered C1639 (diagram “automatic gearbox ECD-3”).
If you have a look at the C1639 connector, pins 17 and 18 are used for the serial communication with the ECU (C0913-75 and -77).
This is the same on the TF, but there it’s C0932-17 and -18 leading to C0159-75 and -77.:
Great - looks as though I was on the right lines with C0932-17 via MEMS3 to EOBD socket pin C0040-7 :D :thumbsu:

I hadn't guessed on C0932-18, but I guess that is not too important, as it would appear that the access is via MEMS3.

Now it is over to guru Philip! :thumbsu:

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Re: Steptronics

Post by pscan.eu » Wed Feb 10, 2016 7:02 pm

There are also MEMS2J with steptronics aren't there? What about MEMS1.9?

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Rob Bell
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Re: Steptronics

Post by Rob Bell » Wed Feb 10, 2016 7:57 pm

No - to the best of my knowledge, all Steptronics were EU2 compliant with MEMS 3 (120PS 1.8MPi engines)

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Mykel
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Re: Steptronics

Post by Mykel » Thu Feb 11, 2016 5:49 am

MEMS2J was only used on VVC engines, which could not be used wth the Em-CVT box for rev limiter reasons. Also, both “old world” MEMS are not reprogrammable, so I doubt they could incorporate the functions necessary for talking to the GUI at all.

The earliest MGF Stepspeeds were released with just EU2 compliance, so no second lambda sensor, but also used MEMS3 units. In fact, they were the only cars to use MEMS3 with a VIN ≤522572. But the circuits for EU3 emissions control were simply switched off. Later ones from 522573 (like my Wedgewood SE) are fully EU3 compliant. I have no information about this history on the 25/ZR or 45/ZS, though. But I do think the Rover 45 was also released quite early with the Em-CVT box.
MGTF:
2004 TF 135 in Monogram Spectre, black leather, RHD
MGZR:
2001 ZR 160 in Solar Red, LHD, LPG conv
Classic:
1972 MG Midget MkIII RWA in Blaze Red
MGF Register regional rep for Germany -- germany@mgfregister.org

pscan.eu
Posts: 135
Joined: Sun Apr 14, 2013 9:32 pm
MGF Register Region: South East

Re: Steptronics

Post by pscan.eu » Thu Feb 11, 2016 11:24 am

I have a Rover 45 automatic ECU here. I think that all 25/45 were MEMS3. The MEMS2J was only used in the Rover 200 BRM.
I also have what I think is a Rover 45 MEMS3 ECU. The VIN number in the ECU is SARRTMWBBYD497115. The trouble is that I think that this is from a manual one. Is it possible to get this reprogrammed as an automatic ECU? or is it just cheaper to get another ECU from a scrap car?

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Mykel
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Re: Steptronics

Post by Mykel » Thu Feb 11, 2016 1:41 pm

IIRC the MEMS3 ECUs are matched to their future environment on first setup. This is then saved in a PROM area in the box and cannot be changed afterwards.

At least this is what I was told when we had the ECU mapped for our turbo project by (then) Z&F. Mark said I’d have to get an auto unit as this would allow to program one of the available outputs to drive the waste gate solenoid. This – he mentioned – can’t be done on a manual ECU because the connection is not available there. But it might be wise to have a chat with him on this topic.

The VIN you have decodes as:
RT - Rover 400/45/MG ZS
M - 414i, 416i, 420i, 420D, 420Di
W - 5 door
B - 1400 4V MPI-HP, Petrol
B - Manual, 5 Speed, RHD
Y - model year 2000
D - Longbridge assembly plant

By the way, will you be coming to the Stoneleigh show next weekend?
MGTF:
2004 TF 135 in Monogram Spectre, black leather, RHD
MGZR:
2001 ZR 160 in Solar Red, LHD, LPG conv
Classic:
1972 MG Midget MkIII RWA in Blaze Red
MGF Register regional rep for Germany -- germany@mgfregister.org

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Rob Bell
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Posts: 14422
Joined: Tue Oct 02, 2007 2:36 pm
MGF Register Region: South East
Model of Car: MGF 1.8i + MGF Shed!

Re: Steptronics

Post by Rob Bell » Thu Feb 11, 2016 4:13 pm

Yes, easier to get a MEMS3 from an auto.

There may be a slight price premium though, because those undertaking turbo conversions want to use the automatic MEMS3 for the reasons mentioned by Mykel!

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Mykel
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Posts: 2759
Joined: Thu Dec 30, 2010 8:13 pm
MGF Register Region: Europe
Model of Car: MG TF Monogram
Location: Schwalmtal, NRW, Germany

Re: Steptronics

Post by Mykel » Thu Feb 11, 2016 5:46 pm

Rob Bell wrote:There may be a slight price premium though, because those undertaking turbo conversions want to use the automatic MEMS3 for the reasons mentioned by Mykel!
I humbly reckon that the market influence generated by those uh, these nutters is still quite faint, Rob. :lol:
MGTF:
2004 TF 135 in Monogram Spectre, black leather, RHD
MGZR:
2001 ZR 160 in Solar Red, LHD, LPG conv
Classic:
1972 MG Midget MkIII RWA in Blaze Red
MGF Register regional rep for Germany -- germany@mgfregister.org

pscan.eu
Posts: 135
Joined: Sun Apr 14, 2013 9:32 pm
MGF Register Region: South East

Re: Steptronics

Post by pscan.eu » Thu Feb 11, 2016 7:07 pm

The cheapest thing would be for someone to lend me a MEMS3 auto ECU. I will only need it for a week or two, and I won't damage it.

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Rob Bell
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Re: Steptronics

Post by Rob Bell » Thu Feb 11, 2016 8:17 pm

If I had one Phil, I'd certainly lend it you - but unfortunately I don't. :(

Anyone got a spare? I guess a 25 or 45 CVT MEMS 3 ECU would be fine?

pscan.eu
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Re: Steptronics

Post by pscan.eu » Thu Feb 11, 2016 8:22 pm

yes it would

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