Re: [DML] RPM Relay/ECM/Pulse generator Diagnostics
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Re: [DML] RPM Relay/ECM/Pulse generator Diagnostics



Good idea. I agree that this could be the problem. The easy way to check 
this is with a timing light. Then you don't have to mess around with the cap 
and wires...unless the timing light shows the rotor to be pointing in the 
wrong direction.

-Joe Kuchan

>From: "Bernie" <bmanderville@xxxxxxxxxxx>
>Reply-To: dmcnews@xxxxxxxxxxxxxxx
>To: dmcnews@xxxxxxxxxxxxxxx
>Subject: Re: [DML] RPM Relay/ECM/Pulse generator Diagnostics
>Date: Tue, 05 Jul 2005 22:21:34 -0000
>
>Check your rotor, and make sure it's on the right way.  I have had
>it happen to me before (not on a DeLorean) and it's really
>embarresing, flip it 180 and the engine starts.  Just give it a
>quick check.  All of your symptoms point to it.
>
>Bernie
>
>--- In dmcnews@xxxxxxxxxxxxxxx, "Tom Tait" <TTait@xxxx> wrote:
> > I'm concerned because my failure coincides with replacing the cap
>and rotor and I'm afraid I disturbed something at the distributor,
>When I last had time to look at the car a few days ago (my wife is
>sick so the car is on the back burner for a bit)  I was able to
>determine that the RPM relay was not closing, but was getting a 3
>volt DC signal as read by my meter.  I now understand that the
>signal is a pulse and cannot be read realizably in a DC voltage mode.
> >
> > I'm happy to replace the relay, and am looking at the upgraded
>relay from SpecialTauto,  but I'm really more concerned that I
>screwed something up elsewhere.  My understand was that the signal
>went from the distributor to the ECM and then to the relay.  I'd
>love to verify proper operation of each of these components.
> >
> > What do I really need to do?  Check Ohm reading at the rear
>firewall connector and verify 600 ohms - right?  At all times or
>only when cranking?  This tells me the distributor is ok, but maybe
>not the ECM?  I do suspect that I need to reset the timing at the
>distributor - when installing the cap I inadvertently knocked the
>Rotor, although I tried to put it back in its original position I
>probably screwed that up.  Could the timing being out cause the RPM
>relay to malfunction?
> >
> > It just seems like a heck of a coincidence that I would lose an
>RPM relay while messing with the distributor.
> >
> > Tom
> >
> > -----Original Message-----
> > From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On
>Behalf Of doctorDHD@xxxx
> > Sent: Monday, July 04, 2005 5:36 AM
> > To: dmcnews@xxxxxxxxxxxxxxx
> > Subject: [DML] RPM Relay/ECM/Pulse generator Diagnostics
> >
> >
> >
> > Tom,
> >
> > What exactly are you trying to accomplish or find out?
> >
> > The "signal" going to the RPM relay is on the WS wire (white with
>a slate
> > stripe) and comes from the Ignition ECU to ignition coil  primary
>connection.
> > It is a "tach" signal and thus you should be able  to get a
>reading with a standard automotive diagnostic tachometer.
> >
> > If this info does not help, please give us more details about what
>you  need.
> >
> > D² & 6530
> > Currently undergoing a water pump change.
> >
> > Message:  6
> > Date: Sat, 2 Jul 2005  15:16:59 -0700
> > From: "Tom Tait"  <TTait@xxxx>
> > Subject: RPM Relay/ECM/Pulse generator  Diagnostics
> >
> > Is there a procedure available to test the signal going to  the
>RMP relay?  Can the relay itself be tested with a 12 VDC power
>supply or do I need an alternating/pulsing current?
> >
> > Tom Tait  #10902
> >
> >
> >
> >
> > Thank  you,
> >
> > Dave
> >
> >
> >
> > "Just Say  NO, to the COUCH POTATO!"®
> >
> >
> > To see how go to _www.tvpedaler.com_ (http://www.tvpedaler.com/)
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> >
> >
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> >
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