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I've got a 2000 Honda Civic iSR with the old 2+3 pin Honda DLC which I'd like to read ECU data from.

According to the Evoscan website the pinout for the 3 pin dlc is ISO 9141 K-Line, B+ and ground from left to right.

So I hooked up the K-Line to pin 7 on my ElmScan5, with power going to 16 and ground to 4. I verified I had the pins correct using a multimeter.

Now, according to the DLC page of the Hondash software cars with this DLC can be Honda OBD1 ( 92-95), OBD2A (96-99) or OBD2B after that.

So I figured that the car is probably OBD2B, so I tried the open source ScanTool.net software developed by the makers of the ElmScan5 but it wasn't able to communicate with the ECU.

So I also tried the Hondash software, but that also didn't work. Now it could be that the Hondash software only works with their own DLC connector they sell, and not with a standard Elm tool.

So I'm wondering if anyone might have any suggestions of software that will work with my current scan tool? I ran into a similar problem with my Mazda 323, and 626, which used either J1850 PMW or K-Line. I could use my standard OBD2 adapter, but needed special software like ForScan to understand the software protocol they were using; regular OBD2 software couldn't communicate with them.

EDIT 19th Sept. 2016

I was looking at the US Civic 96-00 WSM and saw in the "Connector Views" section p. 202-28 that pin 21 ( blue / yellow wire ) on PCM connector "A" is labeled "K-Line" ( D1685, All '99-'00 Models except Dl6Y5 M/T ) which would of course include my 2000 D16Y8 Civic.

Great! Then I looked for the DLC connector, but of course only found the 16 pin OBD2 since this is a US WSM. I'm assuming however that they're using the same PCM all over.

What surprised me was this:

enter image description here

Now according to the OBDII standard, pin 7, which is clearly not connected, is the ISO 9141-2 K-Line pin, and pin 15, which is apparently connected to the same blue/yellow wire, is connected. However according to the standard, pin 15 is the optional ISO 9141-2 L-Line pin.

What in the heck is going on here?

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