Re: 1995 Cirrus 2.5L stall condition




"Mopar_Elvis" <swells@xxxxxxxxxxxxxxx> wrote in message
news:1143673409.377026.222470@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Glen,
I am a fixed ops manager at a DCX dealership, first posts here, thanks
for responding. We do have very good diagnostic techs, but this one is
kicking our ***.
The co-pilot shows nothing, and the DRB is too slow in scope to show
much of a spike, at times we can see it at stall, so there is something
there. You know the problems we have had on the grounds of these
2.5L's, problems in the harness bends and splices. We assume it is a
similar condition, but cannot get an out right failure or wrong voltage
reference to point to anything. I will add one more strange glitch, and
it might not even be related as the vehicle still stalls with the VSS
pin out, the DRB will at times show speed sensor flashs upwards of 200
mph, only for a second or so. I have not seen this, the tech reports
this to me. I'm not a diagnostic tech, but do have a vested interest in
helping our techs solve difficult problems. Sometimes I ask some really
stupid questions of them to review the problem, but it just might be
enough to shift the thought train to a resolution.
The PCM is a reman, all numbers have a supersedence to R5012458-AA and
the original PCM had exactly the same responce. When the distributor
died in the stall, I belive everyone thought, "ok, another one, problem
solved"...I would have too, not the case, came back still stalling, so
with the counter resetting and showing garbage in MAP with correct
voltage and barometric we replaced the PCM. Drove 100 miles no stall,
back in a week, same condition. Correct me if I'm wrong but a spike on
the 8v sensors, the main PCM supply/ground or something on the
programing bus wire is about the only thing that could cause a reset?
Can you think of any really strange, off the wall conditions with the
grounds or supplys you have seen?

Steve Wells

Keep in mind that the speed sensor cut off speed is I believe 114 mph, if
for some reason the PCM is seeing this speed is it possible that this is
causing the problem? Can you see this on the data recording and compare the
stall to the MPH glitch? But then again, you say you disconnected the VSS.
(possible pcm problem?) what about secondary indicators has the tech
monitored those when the problem occurs?
I have never seen a spike on the 8 volt, I have seen alot of sensors pulling
the 8volt supply down and causing all kinds of problems. What about the a/c
transducer, if im not mistaken isnt that 8 volt on the same circuit, is it
possible that is is pulling the voltage down?
Normally when I came across ground problems in the sensor circuit A fault
was set for sensor voltage high, and if the fault wasnt set most times I
could monitor that in the sensor voltage screen.
And last thing and I hate to ask this because normally its a waste of
time......Have you contacted STAR?
My opinion only

Glenn Beasley
Chrysler Tech





.