[DML] Re: Fuel pressure & RPM Relay

["Matt Spittle" <supermatty@xxxxxxx>]

--- In dmcnews@xxxxxxxxxxxxxxx, "endotex23" <endotex23@xxxx> wrote:
In this example all the owner had to do is study the diagram to 
answer his own question.  Learning how is not difficult and basic 
auto electrical theory is something anyone who wants to work on cars 
should learn. 

So Greg,

I studied the diagram to answer my own question, and I wasn't able 
to; not even with a background in electrical engineering.  

Part of my original question was if the frequency valve was supposed 
to run while the key was in the ON position.  So I look at the 
diagram...it looks like the frequency valve is powered by the lambda 
relay, which is powered by the RPM relay.  If this all happens, then 
whether the frequency valve turns on or not is determined by pin 15 
of the ECU.  Do you have a schematic for the ECU, because it's not 
obvious to me what it does? 

Second, it's also not obvious WHY the RPM relay only should activate 
for "about a second" when the key is on the ON position.  The 
service manual clearly states that it will, but why?  What controls 
that?  If my frequency valve is buzzing and my fuel pump is running 
when I put the key in the on position for more than a second, 
perhaps this is a failed component somewhere (capacitor in the RPM 
relay?)?  Do you have a schematic for the RPM relay?  

So this is why I asked the list.  Please correct me as to where I 
should have looked if my "homework effort" was inadequate before 
posting.  

thanks,

Matt
#1604








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