ECU & "engine running" signal question
 

How does the ECU know the engine's running? Does it use an alternator
output signal, or does it use the RPM pickup in the distributor?

Also, what's the purpose of the Starter Signal as used by the EFI main
relay? Is it only to energize the fuel pump relay while the engine's
cranking?


--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/

Re: ECU & "engine running" signal question
 

Crank postion sensor in the distributor

yes

"TeGGer®" <tegger@istop.c0m> wrote in message
news:Xns95F469625643Cteggeratistop@207.14.113.17.. .
> How does the ECU know the engine's running? Does it use an alternator
> output signal, or does it use the RPM pickup in the distributor?
>
> Also, what's the purpose of the Starter Signal as used by the EFI main
> relay? Is it only to energize the fuel pump relay while the engine's
> cranking?
>
>
> --
> TeGGeR®
>
> The Unofficial Honda/Acura FAQ
> www.tegger.com/hondafaq/

Re: ECU & "engine running" signal question
 

"Mista Bone" <mistab0ne@nospam.net> wrote in
news:xT7Nd.6825$XY5.978@fe2.columbus.rr.com:

> Crank postion sensor in the distributor


So the if the RPMs are above a certain amount, the ECU considers that the
engine is running?

I ask because obviously the crank angle sensor would be registering
movement even during starter operation.