Re: Re:[ST] 99 Sprint ST fault codes and Idle or stallingproblem.continued

["Chris Harwood" <Chris@xxxxxxxxxxxxxxxxxx>]

Stephen

The Factory manual shows Air Inlet Temp sensor between 11 and 34 on the
ECM.
It also says the resistance should be:
30 deg C	1k6-1k8
25 deg C	1k9-2k2
20 deg C	2k3-2k7
15 deg C	2k9-3k3
That should be enough for you to check it.

BArometric Pressure sensor does share supply and ground with the
Throttle Position Sensor but each returns to pins 13 & 15 respectively
presumably with the measurement.  I would expect the ECM to measure the
throttle position at startup and calibrate it to zero (my guess) so
don't worry about 10% fully closed.

This is all on an MC2000 ECM (single connector).

Chris Harwood
00 RS

>>> stephen@xxxxxxxxxxxxx 16/06/2005 18:45:40 >>>
First of all, thanks for the help so far, guys.

  What I have found is that the throttle position sensor, intake air
pressure sensor, intake air temp sensor, engine coolant sensor, and the
low
fuel sensor share connection 34 on the MC2000 ECM.  The throttle
position
sensor and the intake air pressure sensor share connection 12 on the 
MC2000
ECM.
   While checking continuity of the wires I found that there is  1.818
(a
little less than 10%) continuity between 12 and 34, although not near
full
continuity.  I checked the pins on the throttle positioning sensor and
found
the same 1.818 continuity on the pins that connect to 12 and 24.  With
the
connector off of the throttle positioning sensor, checking continuity
on the
air intake sensor reads zero.
  The continuity of those two pins on the throttle positioning sensor
do not
change when twisting the throttle.  I notice in the haynes manual that
it
takes special equipment to set the throttle positioning sensor if it
is
removed or replaced.  I also notice that the throttle butterflies do
not
close 100%, but maybe 99%
   I have two questions now.  Should there be almost 10% continuity
between
two pins of the throttle positioning sensor?  Could that be caused be
the
throttle positioning sensor being mis-positioned or faulty, or is it
supposed to be that way and I need to keep looking for the source of
this
interesting problem?

Stephen




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