ECU & "engine running" signal question

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TeGGer? - 05 Feb 2005 15:19 GMT

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/

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Mista Bone - 05 Feb 2005 18:03 GMT

Crank postion sensor in the distributor

yes

> 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?
[quoted text clipped - 8 lines]
> The Unofficial Honda/Acura FAQ
> www.tegger.com/hondafaq/

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TeGGer? - 05 Feb 2005 20:30 GMT

> 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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