I built this tool this evening to help further diagnose a DM code #6 (the idle on my 94 e320 wagon has been really high). It appears to work on pin #6 and #7 (Pin #6 returns 8 flashes and pin #7 returns 1 flash). However when I try on pins 14 and 8 I get no feedback, not even a single flash. Any ideas why I wouldn't get any feedback from these pins?

**Update** - I went to radio crap and bought the specific LED as per the instructions earlier in the thread and that fixed the problem.