I'm looking at diagnosing problems with a L-Jetronic system

[Victor Tomanov]

It's an 82. These cars made in Japan did not have the Diagnostic side of
the Computer installed nor did it come with a check engine light. It's
the most frusterating part of the car. I used to be on the Supra list
but now need a wizard to pick mail relevant to what I'm interested in.
Until then I just goto the Web page for info. The car doesn't cold start
and I'm sure it's to do with air, (cold start injector fires fine) the
Idle air bypass is what I'm looking at as a problem but I would love to
talk to someone who has played with these devices and know how to check
them beond what the books say. Info like flow through valve and percent
close when cold would be great. I'll get back on the Supra List and see
if anyone has any ideas.
Thanks, VIc.

Jake Lindeke wrote:
> 
> These questions would be better sent to the toyota supra mailing list
> www.supras.com
> 
> > I haven't found any specs on the sensor to test it. This is a Toyota
> > Supra. How would you test it with an ohm meter at hot and cold temp?
> >
> > Walter Petermann wrote:
> > >
> > > Hi Victor,
> > > does the system have a working O2 sensor?
> > >
> > >  Walter
> > >
> > > Victor Tomanov wrote:
> > > >
> > > > The ECU that controls my system doesn't have a diagnostic capacity.
> > > > I'm at a loss at how to figure out if the ECU is running the motor
> > > > correctly and if the mixture is realy what it should be. It seems
> > > > rich. I'm looking for a way to modify the lean rich mixture variable
> > > > either by taping into one of the sensors or adding a pot to the ECU.
> > > > Does anyone have a working knowledge of this injecting system? Thanks
> > > > for any help.
> 
> there is a vf1 signal on the diag port. if hook a multi meter to it. i cant rember
> what each voltage means but i think the range is 1v - 5v one meaning really
> lean, 2 kinda lean, 3 perfect, 4 kinda rich, 5 really rich.  this works for all toyota
> cars and trucks.
> 
> --Jake Lindeke
> --SOGI South-East Chapter Coordinator
> --http://sesogi.bsfh.org