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ECU & "engine running" signal question

  #1  
Old 05-04-2005, 11:16 AM
TeGGer®
Guest
Posts: n/a
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?


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TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
 
  #2  
Old 05-04-2005, 11:16 AM
Mista Bone
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Posts: n/a
Re: ECU & "engine running" signal question

Crank postion sensor in the distributor

yes

"TeGGer®" <[email protected]> wrote in message
news:[email protected] .
> 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/



 
  #3  
Old 05-04-2005, 11:16 AM
TeGGer®
Guest
Posts: n/a
Re: ECU & "engine running" signal question

"Mista Bone" <[email protected]> wrote in
news:[email protected]:

> 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.

 
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