Diagnosis port question?

[MA70_452]

Can i use the diagnosis port for datascan?
Anyone has the pinouts for the diagnosis port?

[CRE]

Specifically what info are you looking to get out of it? More than just error codes I presume?

[MA70_452]

yes, like doing obd scanning

[MA70_452]

i want to connect the diagnosis port to PC and do a data scan and real time logging, so i need to know the pinouts of it

[CRE]

The pinout is printed under the cover of the diag port. As for what values and ranges you should expect from each line I cannot help. I believe our diag port is CAN based though.

I'm sorry I can't offer more info...I don't know of anyone who's done what you're looking to do.

[CRE]

I'm not 100% certain about the system using a CAN bus. A reliable source of info when it comes to Toyota electronics insists that it is.

Here's some reading material for you:

Pinout:
http://www.cygnusx1.net/Supra/TechTips/engine_error_codes.aspx

ECU Pinout:
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=FI&Page=31

ECU signal diag:
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=FI&Page=122

Pulling diag codes:
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=FI&Page=23

CAN Bus Interface:
http://www.interfacebus.com/Design_Connector_CAN.html

CAN Bus overview:
http://en.wikipedia.org/wiki/Controller_Area_Network


Can't be done.

I wouldn't say that... it's definitely possible. It's the amount of work involved which begs the question: "Is it worth it?"

[CRE]

So glad to amuse...

I'd been doubting the CAN thing and yes, I know our cars don't have either ODB variant. There are plenty of things you could monitor (including: timing, throttle position, knock and the o2 sensor (although a narrowband o2 sensor's a bad source of data)) using a simple serial interface...

But again, is it worth it? It's not going to give you near as good an idea of what's going on with your car as an ODB II datalogger would. But, the point still stands that YES something could be made... weak though it may be.

[MA70_452]

Thanks you for all your quick replies and information, many thanks!

[lagged]

So glad to amuse...

I'd been doubting the CAN thing and yes, I know our cars don't have either ODB variant. There are plenty of things you could monitor (including: timing, throttle position, knock and the o2 sensor (although a narrowband o2 sensor's a bad source of data)) using a simple serial interface...

But again, is it worth it? It's not going to give you near as good an idea of what's going on with your car as an ODB II datalogger would. But, the point still stands that YES something could be made... weak though it may be.


are you so sure about being able to monitor timing with a "simple serial interface"?

they JUST figured out how to monitor timing with the MAFTpro.

[Nick M]

With the Vetronix tool, you can watch the oxygen sensor switch for fun. If you want serial data, get a DSO, and run the pick up on the different readings you want at the ECU.

The MA70 became OBD level one compliant. Not level two of course.

[JDM 1JZ]

long story short hes looking to data log like you can with a DSM, through the diag. port

[CRE]

are you so sure about being able to monitor timing with a "simple serial interface"?

they JUST figured out how to monitor timing with the MAFTpro.

Sorry just saw this... MAFT Pro's has timing monitoring for ages... it's timing control they just added and YES you can rather simply monitor timing via a serial port, it's just a pulsed signal.