Hello, I have a 1990 190e 2.6. I built a homemade code reader and I can pull codes but I do not know which system the pins are for. This is because the MB manual says it should have an 8 pin diagnostic socket but I have a 16 pin socket! Only pins 1,2,6,7,and 14 are used and pin 1 is the ground pin. Can anyone please direct me to the individual system each pin is for?

Another question is regarding the 9 pin diagnostic socket by the electronic ignition on the driver’s side engine bay. Are there any guides to recovering and using the codes from this socket?

Thanks

I'm sure you really meant pin 3 not 2:

pin 3 - CIS-E (fuel injection)
pin 6 - SRS
pin 7 - A/C (HVAC)
pin 14 - MAS engine control

Not entirely sure how to access codes from the 9 pin, but I know you need a multimeter with a duty cycle function.

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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE

Skiier3_9- Yes, I meant pin 3, thank you very much for the info.