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Post Info TOPIC: Serial Gauge Data (tech line)


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Serial Gauge Data (tech line)

So, I have an ECU on the bench and wanted to play with the gauge data (do some logging, etc).  The tech line is supposed to be the serial data, but when I power up the ECU, I just have a constant pullup to +5V.

I have 12.5V at B+ and gnd on E1.  Same pins I used to clock the data through the AUD.

Do I need something extra to make the serial line for the gauges go active?  I tried a second ECU, just in case I had a dead one, but the same thing.

I put a scope on it, and it's a pretty solid nothing.  Scoping the crystal shows lots of activity so I think the ECU is alive.




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You can find info about which pins to use here

to get engine data from the ecu you have to send an initialization sequence, easiest way to see how its done is to take a look at the code in



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The tech line to the gauges sends only ECT, Gear and Mode in a stream. At least the AIM-Dataloggers says this. I had also tryed to catch them with the k-line from my AIM-EVO4-Logger but it did not work.

If you find out more, please let me know.

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