[Diy_efi] '7747 trouble code list

Ne14RoxCJ at aol.com Ne14RoxCJ at aol.com
Thu Dec 12 19:09:06 GMT 2002 

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In a message dated 12/11/02 2:59:33 PM Central Standard Time, sravet at arm.com 
writes:


> > Does anyone know if the elimination of the oil
> > pressure switch will affect the ecm?
> 
> It won't.
> 
> --steve
> 
> 


The ECM will use the Fuel Pump Relay for pre-start pressurization (a few 
seconds) and during cranking. After the engine starts, and builds oil 
pressure the pump is powered through the pressure switch. I suppose 
eliminating these components and powering the pump with a "hot in run" 
curcuit would work, but the pump will run ANY time the key is on. Also, the 
OP switch prevents the engine from running with less than ~5psi. I consider 
it "cheap insurance" for my $$ engine.

With any setup, the ECM needs to see the voltage going to the fuel pump at 
pin B2. A code 54 will set if the ECM sees less than  2 volts for 1.5 sec 
since the last reference pulse was received. HTH...

Beau

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<HTML><FONT FACE=arial,helvetica><FONT  SIZE=2>In a message dated 12/11/02 2:59:33 PM Central Standard Time, sravet at arm.com writes:
<BR>
<BR>
<BR><BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">&gt; Does anyone know if the elimination of the oil
<BR>&gt; pressure switch will affect the ecm?
<BR>
<BR>It won't.
<BR>
<BR>--steve
<BR>
<BR></BLOCKQUOTE>
<BR>
<BR>
<BR>The ECM will use the Fuel Pump Relay for pre-start pressurization (a few seconds) and during cranking. After the engine starts, and builds oil pressure the pump is powered through the pressure switch. I suppose eliminating these components and powering the pump with a "hot in run" curcuit would work, but the pump will run ANY time the key is on. Also, the OP switch prevents the engine from running with less than ~5psi. I consider it "cheap insurance" for my $$ engine.
<BR>
<BR>With any setup, the ECM needs to see the voltage going to the fuel pump at pin B2. A code 54 will set if the ECM sees less than &nbsp;2 volts for 1.5 sec since the last reference pulse was received. HTH...
<BR>
<BR>Beau</FONT></HTML>

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