Hello everyone,

reading some articles here on code readers I decided to make one for myself. I had a look at a diagram posted here at some earlier stage and in half an hour the reader was done.

It also works as I found out a few minutes ago. I suppose the cache memory stores various codes at once. When I pressed the button to check for a code the LED flashed 8 times. When I pressed the button after that (no difference when I disconencted and re-connected the reader) the LED flashed 4 times. Then it flashed 2 times. Then it flashed 7 times. Pressing again - 11 times. That was all, after that the reader started flashing 8 times again.

Intriguing. Can it be that the cache stores all fault codes that appeared until it was re-set? I suppose that had the coolant temp sensor been faulty (for example) there would have been a code stored. Had the sensor been replaced in the meantime the code would still appear in the reader although the sensor would be functioning. Am I right? It would disappear only after re-setting the memory.

So now I am at loss whether the codes I have are actual codes or codes from previous things that went wrong but had been repaired in the meantime.

The question is: how can I re-set the memory so that all codes are cleared? I found no reference on that anywhere.

Thanks for your answers.