2111 code on 97 5ktq

[Doyt W. Echelberger]

Thanks, Nate. I'll replace it. Greatly appreciate your sharing of ECUspeak.
Hope someone else chimes in about what the ECU does with the RPM signal.  Doyt

 >>>>>>>>>>>>>>>>>>>>>>>>>>>.
At 11:50 PM 9/14/2002 -0400, you wrote:
> > Hello listers.......a question about code readings.
> >
> > 2111 indicates "RPM sensor signal not getting to Mac 11C ECU in my 87
> > 5ktq."  .......snip..................
>Totally different 'sensors'. Your telemetry gets it's information from the
>ECU actually. ......snip................
> > My second question asks how the ECU _uses_ the RPM signal. Does the RPM
> > signal have anything to do with the way the ECU handles starting, or how
>it
> > adjusts timing or fuel delivery or boost?
>I believe the ECU only uses this 'RPM' signal to check for rapid changes
>in RPM (before one cam rev is completed), though it may use it to tell
>precisely what position the crank is in for ignition accuracy. I'm not
>sure. ..................snip.................think I got some of that
right, and with any luck others that can better explain the timing
references will chime in.

>HTH!
>-Nate
>'89 90tq
>www.newtsplace.com/90tq