So - I was reading codes from the 16 pin DM today when I messed something up. With the ignition on/engine off-

I read a code on pin 3 (6 blinks - Idle Speed Control Faulty) then attempted to clear it by holding the sw. down for 8 - 10 seconds. I then tried to read the code again (to make sure it was cleared) and it came back (still 6 blinks, not 1). While it was flashing the code out I turned the ignition off. This must have messed something up because the "Check Engine" light then came on when I started the car. I thought that I must have messed up the memory so I unplugged the battery for a bit and reconnected it. The check engine light went out.

The problem is that if I try to read the codes on pin 3 I get nothing (ignition on/engine off AND ignition on/engine on) - no blinks after holding the switch down for 2 - 4 seconds. Furthermore, when I do this, the "Check Engine" light comes back on.

What did I mess up by turning the igntion off as the car was reading back the code from pin 3?

HELP!! -- Thank you!!

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