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Powering DTC via E7 pin

541 Views 10 Replies 6 Participants Last post by  Lotus
Hey ya'll, I'm super confused on this, I have an 2005 Accord ECU I'm trying to power the DTC when the car is off to save emissions data. I tried to hook up 12v to pin E7
via the coil side of a relay and I think I fried it instead.

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Looking at the diagram I see that pin E7 is hooked to the Main Relay on the coil side and constant 12v is on the other end of the coil.

Well I don't know if thats the whole story as now my E7 won't go to ground it just drops from 12v when the car is off to 2.4v when the car is in position 2. If I order another ECU I don't want to fry that one too trying to power the DTC. Is there a better way to do this?

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Anyways this is what it says for the pin. Thats why I figured I'd have to figure out some way to jam 12v into it when the car is off.

This person had the same question but of course no one answered them :cry::

Any help would be appreciated!


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Sorry, this is too complicated for me to understand
Then don't reply :mad:
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E7 is the relay control as specified in your circuit diagram, it is not an ignition input. The relay it turns on then gives itself power on pins A2 and A3.

I'm confused what the purpose of this is? Why can't you just turn the key on to save data?
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