Engine Oil Pressure Switch/Fuel Pump Wiring Question - Mystery Wires?

[Justa6MB]

Well the reman ECM corrected the problem. Fuel pump now cuts in for 2 secs and quits Thanks guys!

 

[RmvBfrFlght]

Well the reman ECM corrected the problem. Fuel pump now cuts in for 2 secs and quits Thanks guys!

OK, what ever you do don't trash the bad ECM. A I posted earlier, it is just a small 50-cent transistor that goes bad. It may cost a little more to pay someone for the time to replace it. But it is a good save on a stock ECM.

RemoveBeforeFlight

 

[Justa6MB]

Just how would I find out which transistor is the culprit?

 

[RmvBfrFlght]

Just how would I find out which transistor is the culprit?

I took some pictures which I will post later, need to get to a different PC.

The culprit is located on the lower board, in about the center of it. Will be a basic TO-92 case, but with a twist. It will be either taller, or it will have a small metal tab protruding from the top.

RemoveBeforeFlight

 

[RmvBfrFlght]

OK, pictures, again on the lower board, can use a PN2907 to replace it. Click on the thumbnails for a full size pic. Please read previous post for info on the two different transistor possibilities shown.



Forgot to add, ignore the gray wire, a stock ECM won't have that.

RemoveBeforeFlight