MBE ECU Connection for Diagnostics

[sk7ine man]

Now that i have my car running right, i cant seem to locate the diagnostics socket, typically a serial port or 3 pin plug AFAIK.

The ecu is the MBE 970, ive opened it up but there is no connection. Externally you have the main loom which goes into the engine, a seperate black rf lead size cable which disapears behind the stereo, and a short lead with a 2 pin male connector hanging from the side.

I cant workout how or what the diag. connection is and how to connect to it, any ideas?

[ridds]

There are 2 types of connection a 9 pin serial actually on the board inside the ECU or a 3 pin fly lead that should be about 6 inches out of the ECU.

You may well have the second type that someone has extended?

[sk7ine man]

ridds said:

There are 2 types of connection a 9 pin serial actually on the board inside the ECU or a 3 pin fly lead that should be about 6 inches out of the ECU.

You may well have the second type that someone has extended?

...but it inly has 2 pins?

[ridds]

It isn't it then.

[SimonKD]

My 2003 model has 2 flying leads. One 3 pin to plug in a pc with diagnostic software, the other a 2 pin, is for a TVR fault code reader I believe.

Regards
Simon

[spitfire4v8]

Your car wasnt made with the 970ecu, so thats been changed at some point and sounds like the ecu loom was never updated with the 3pin loom. you're stuck until you can get that 3pin loom into the multiplug.

[sk7ine man]

spitfire4v8 said:

Your car wasnt made with the 970ecu, so thats been changed at some point and sounds like the ecu loom was never updated with the 3pin loom. you're stuck until you can get that 3pin loom into the multiplug.

how would i go about connecting a 3 pin? Is there a guide? What is the cable that dissapears under the centre console?

[sk7ine man]

Just had Steve_t to look at the car, top bloke The ecu appears to be a 4.5 and only has a 2 pin flying lead. How ould i go about connecting a 3 pin connection for diagnostics?

[Peppe]

Try to search the forum.
Like a year ago somebody made a description of which pins in the big connector on the ECU, should be connected to the PC.
Otherwise it would be possible to look at a car with the 3 pin connector to be able to locate which pins on the ECU should be connected to the PC. When you have that info you can make your own cable for the PC. I suggest that you make it long enough to be used without taking the panels around the ECU away.

I have put a cable from the internal ECU serial connector to a seriel panel connector that is placed on the carpet trimmed panel above the pass footwell. Now I don´t need to take the car apart to hook up the PC to the ECU.

[sk7ine man]

Just spoken to sbd who deal in mbe and bought a can/serial connector which i can put into the loom for a diagnostics port. They said id need a serial cable with resistors in to connect to the laptop,is that necessary or can i connect straight?

[Steve_T]

Bear in mind that SBD supply the general MBE ECU and may think you're talking about that rather than the Cerbera MBE which was a special for TVR (because of the unusual firing angle).

[sk7ine man]

Your right Steve. Just spoke to Paul @ Austec and he said all i need is the 3 pin plug which tvr powerstores are sending me. What are the ecu pin outs for the 3 pin plug? Any diagram?