The ECU momentarily grounds one side of the injectors to pulse them. The
other side should have power whenever the fuel pump does. Depends on
harness version though. Some versions power the injectors from the ECU
relay. The versions that use the fuel pump relay can confuse you since
they won't get power with just key on other than a second or two. All
versions rely on the ECU to pulse the ground side. There is a large
transistor in the ECU that does this and these burn out or the solder to
the power leg of the transistor can melt away.

Mark

Mark Dearing wrote:
> 88 vannie with no injector pulse. no current to them, will runn if  feed
> fuel. grounds all checked out. I am thinking the ECU but looking for  feedback
> on anything that can cause this .  later  mark  d
>