OBD connection to the RX3

[No1Vic]

Hi Spud, mmmmm after trying what you suggested with my scanner althought it said connected Keyword 2000 I pulled the O2 sensor lead off and no DTC were detected :-( out of interest tried the clear error code function too, came back failed so yes my scanner doesn't after all do anything with our ECU.. I connected my laptop with PCHud and got the error code 49 as current, reconnected the O2 sensor and the error code moved to historic faults. Interesting to see now though the O2 voltage is stuck at 1017mV and not fluctuating with throttle change, assuming it needs to recalibrate to the ECU maybe before it's read properly?

[SpudRider]

Originally Posted by No1Vic

Hi Spud, mmmmm after trying what you suggested with my scanner althought it said connected Keyword 2000 I pulled the O2 sensor lead off and no DTC were detected :-( out of interest tried the clear error code function too, came back failed so yes my scanner doesn't after all do anything with our ECU.. I connected my laptop with PCHud and got the error code 49 as current, reconnected the O2 sensor and the error code moved to historic faults. Interesting to see now though the O2 voltage is stuck at 1017mV and not fluctuating with throttle change, assuming it needs to recalibrate to the ECU maybe before it's read properly?

The O2 sensor voltage normally fluctuates in a sine wave, and this voltage fluctuation does show up when you make a graph of it. However, the PCHud display usually indicates a voltage of 1017 mv when the O2 sensor is operating properly.

[Raptorix]

Hello

You will never connect a handheld scanner to the Delphi MT05 and see any useful information.
The reason is simple: The Delphi MT05 is NOT OBD2 compliant.

Until today PCHUD was the only software able to communicate with MT05. But this is past now because I wrote the new "HUD ECU Hacker" which is based on reverse engineering the ancient PCHUD.

Obviously it runs on all Windows versions and platforms.
It is freeware and it can be configured 100% by the user.
All parameters are defined in an XML file.
This allows to adapt the program even to other ECU's.

It can also communicate over an ELM 327 adapter.
And while PCHUD can only display max 36 parameters at the same time, HUD ECU Hacker diplays them all.

It can record logfiles and export to CSV.
It can clear fault codes (DTC) which did not work in PCHUD.

You find a detailed program description and the download here:
https://netcult.ch/elmue/HUD%20ECU%20Hacker/

Here you see the main window, the dashboard window and a graphic generated from a logfile.
(I don't know why this forum shrinks my images?)

[pyoungbl]

Wow, that's an interesting discussion. You have created a fantastic tool for us RX3 or RX4 owners! I already have the Zongshen diagnostic tool but it's much less capable than what you have developed. Thanks.

Peter Y.