[V8] Short to (+) Intake Air Temp Sensor

[Buchholz, Steven]

... from my experience it seems that the fault detection circuitry in
the ECU is fairly sophisticated ... if the problem could have been due
to an open circuit I doubt that the ECU would log a specific "short to
+" code.  I suspect the description would be "open or short to +" if the
ECU couldn't tell the difference.  

... I just re-read the message and see the report that the code is
0523... this obviously is not a blink code (which are 4 digit codes with
a value of 1-4 for each digit).  How did you read this code out?  Does
your code reader ask you what make and model car you have?  There is
nothing this detailed in the list of codes in the service manual.  

My recommendation to you is to use the "blink" method to read out the
codes ... all you need is a jumper wire and a low power 12v light bulb
... and then look up what codes you see in the service manual or a site
like Scott Mockry has.  

	http://www.sjmautotechnik.com/trouble_shooting/ecufv8.html

Steve B
San Jose, CA (USA)
> 
> If a ground is open - then the ECU can read that as a "short to 12v".
> These kind of problems can be really hard to track down - but by the
number of
> fail codes you get, I suspect wire or connector problems. It would be
unlikely
> to have so many parts fail at once.
> >
> > If you remember the "no, Officer" thread, I have been having an
intermittent
> > condition of surging (revving) at idle along with (but not at the
same time)
> > a situation where the CEL is lit and the car runs rough (with an
abrupt
> > on/off throttle).  The code reader says, "00523 Short to Positive,
Intake
> > Air Temperature Sensor".  This has been replaced as well as ISV, O2
sensor,
> > knock sensor and associated connectors.  The condition will become
evident
> > immediately upon starting, usually when warm (but not always).  I
have
> > noticed that when it is in the CEL mode (limp home?) the idle
doesn't surge.
> > Most of the time the car drives fine, the condition comes and goes
although
> > it seems more likely on a warm restart.  Of course yesterday after a
few
> > good stop and starts, I got the CEL mode for the ride home.  I
parked in
> > front of the house, turned it off and back on (which I had tried
earlier)
> > and it fired up with no CEL.
> >
> > I have tried (with limited success) checking the connectors in the
front for
> > the offending sensor(s), but they get kind of hot and I didn't want
to burn
> > my fingers (again).