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I did as you said. I grounded the green connector, turned on the ign. The check engine light comes on and just stays on. No flashing . According to my manual it says to bridge the st1 pin to the sig rtn pin.Then turn on the ign. and count the number of flashes. It does'nt say anything about grounding any connector. Note: I also have a toyota that i did a diagnostic on some time ago.It had the same instructions which I followed and was able to pull a code. The difference was it had a picture of the test connector and it showed which pin was which.