Re: Idle Speed thermistor

["deloreanfl" <ericp@xxxx>]

Hi Shain,

The thermistor in the Idle Speed circuit activates a circuit in the 
Idle Speed ECU, when the coolant is below 15 degrees C, which tells 
the ECU to open the idle speed regulator a little more - to allow the 
engine to idle faster when it is cold, or warming up.

As Far as what could happen if it were to fail:
I guess (and this is just a guess) it could fail one of two ways:

It could remain in one state, after the engine is warmed, telling the 
ECU to keep the regulator open more and the idle high.

Or it could remain in the other state, never telling the ECU to open 
the regulator more - not letting the engine idle high enough during 
warm up.

I've haven't encountered either problem personally, nor am I sure the 
thermistor would fail in either of these states - but it seems 
reasonable, looking at the schematic. 

Eric
VIN 05557
ericp@xxxx

--- In dmcnews@xxxx, "dsscid" <shain@xxxx> wrote:
> Hello,
> 
> Can someone please tell me what the idle speed thermistor does. I 
> know it has some part in the idle speed control. Could you also 
list 
> what would happen providing the sensor failed. Thanks.
> 
> - Shain