TPS voltage and ECM interpretation

[rr]

Sorta, kinda depends upon which routine wants to know if the engine is
at idle. Typically idle is defined as having the TPS below a certain value
along with the vehicle speed below a certain value. (IE: < 1.4% TPS
and < 2 MPH).

For idle speed control typically the vehicle road speed must be 0. Some
ECMs have separate idle speed tables for drive vs pk/neut. Others just
bump the IAC when placed into drive.

If the VSS is non-operable then no idle speed control either.

BobR.

Dan Griffin wrote:

> A somewhat related question:  How does the ECM know when to follow the
> idling commands?
>
> My '165 has never had that ability...
>
> As far as I can tell, when VSS is sending no pulses, (car sitting still )
> and gear selector sw. in park, possibly neutral... Hands must be off the
> gear selector...Fully warm eng. veh. must be stopped at least 30 sec. ...
> Wait for it...
>
> As far as reading tps position, ( which would be logical )  I dont think
> mine did...
> Dan
> ----------------------------------------------------------------------------

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