kohler efi diagnostic port pinout - The Combine Forum

 
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post #1 of 10 (permalink) Old 03-20-2017, 12:59 AM Thread Starter
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kohler efi diagnostic port pinout

I have a kohler efi twin command 26hp motor and was looking to use the diagnostic software, but in order to do so I need the software and the cable. The cable simply connects to a 4 pin port on the motor and then the other end of the cable is a serial cable to connect to a computer or a serial to usb adapter. I can get the software for about 90 bucks US but they want double that just for the cable. does anybody know the pinout for the port, if so it would be very easy and cheap to make a cable.

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post #2 of 10 (permalink) Old 03-20-2017, 09:26 AM
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page 27. You didn't list your model, so no idea if this is yours

http://www.kohlerengines.com/onlinec..._date_8_13.pdf

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post #3 of 10 (permalink) Old 03-20-2017, 11:07 AM
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It looks like they use a k-line bus so it's not just a simple cable. There would be some relatively cheap circuitry to convert the signal to -12-+12.

They have a pretty good diagnostic through the the sel light. What are you after with the software?
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post #4 of 10 (permalink) Old 03-22-2017, 12:44 AM Thread Starter
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my model is a ecv/ech 749cc efi. Yes your are correct I think they use a k-line bus. The company that makes the cables diagnostic systems associates also makes the same cable for polaris. I have found out how to make a cheap cable for polaris, however on the polaris where the cable connects to the diagnostic port they use a four pin connector with only three actual pins inside. When I look at the kohler connector there is the same 4 pin connector but appears to be 4 wires connected to it. As such I am not sure of the proper pins to connect.

Here is a link to a page where they made to polaris connect cable, but as mentioned I am unsure of the pinout for the kohler
PU-47151 and PU-47102 Details/Info/Alternates? (4 stroke diagnostics cables) - Page 4
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post #5 of 10 (permalink) Old 03-22-2017, 12:47 AM Thread Starter
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I am just after more info than the mil light provides, it also allows me to see hours, clear codes, and run more indepth diagnostics. Just be handy to have but not willing to pay $300 for just the cable, when it can be made for less than 40 bucks.
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post #6 of 10 (permalink) Old 03-22-2017, 12:53 AM Thread Starter
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so Briantee if I am reading the schematic correct it looks from the four pin diagnostic port I get that pin 1 is ground pin 2 is diagnostic communications line pin 3 is ecu and pin 4 is the ground.

Does this make sense to you

Last edited by puddles; 03-22-2017 at 01:00 AM. Reason: error
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post #7 of 10 (permalink) Old 03-22-2017, 01:10 AM Thread Starter
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I am unsure of the proper connection. going from the 4 pin to obd2 connector

4 pin connector obd2 connector
pin 1 --------> pin 5
pin 2 --------> ?
pin 3 --------> ?
pin 4 -------->pin 16

any thoughts, also if you have thoughts let me know if you are quite confident or not, because I am pretty sure if I hook this up wrong I will damage the ecu.

Before I get hassle I know I should just buy the cord and not worry about it, but I like to learn to do these kinds of things, just spending money does not create knowledge for me.
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post #8 of 10 (permalink) Old 03-22-2017, 07:20 AM
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Looks like pin one is ground, pin two is signal, pin 4 is positive.

Pin 3 is the Ecu reset, you take it to ground to reset the ecu and you'd have to to a tps relearn.

So your just using 3 wires to the OBD.

Pin 2 from the diagnostic connector to pin 7 of the OBD connector (k-line)

Last edited by joesixpack; 03-22-2017 at 07:39 AM.
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post #9 of 10 (permalink) Old 03-22-2017, 07:46 AM
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I'm sympathetic to the cause. Just installed a pile of pirated software and picked up the data links for all of our equipment and those links were spendy!
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post #10 of 10 (permalink) Old 03-22-2017, 09:52 AM Thread Starter
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thanks will give it a try once i get the obd cable

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