Re: Steptronics
Posted: 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.
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.