Troubleshooting

[Walter Sherwin]

> I am having trouble with my fuel injection.Some co workers and I are
stumped
> as to what is wrong.
>
> The Integrator will bounce between 240-255 and 0. At idle it will read in
> the upper 200's. It will hit 0 with throttle tip in and go back and forth
> between 2xx and 0 during driving. 02 fluctuates and crosscounts. All other
> sensors seem to be reading ok. Block learn is 124 to 128, as seen on a
Snap
> on Scanner.
>
>Chris



Does your vehicle have an actual driveability problem that you are
attempting to cure, or is this just something that you've noticed while
staring at the scantool periodically?  I had a similar situation once, and
eventually decided it was a software and/or scan tool glitch.  The problem
only occurred when using my Snap-On MT2500 scan tool, but was absent when
using a Tech I.  The vehicle ran fine.

Every once in awhile, one frame of data would get messed up, and then the
next would typically be fine.  Never more than 2 messed frames in a row.
The only two parameters that were affected were the INT and the ESC status.
INT would read funny (ie:
27.....41.....48......0......63.....66......70......225.....232.........
real numbers from scans of that vehicle).  ESC would toggle from NO to YES
whenever the INT was messed.

If you don't have an actual driveability problem, and if you don't think
that your computer is suffering some form of reset (monitor the EST bypass
line, and power & ground lines, with an oscilloscope to look for glitches),
then I would ignore the whole deal.

Walt.

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