Intake Air Temp C Resistance KOhms Voltage (V)
-40 880 4.53
-30 573 4.48
-20 272 4.33
-10 183 4.20
0 95 3.87
10 66 3.55
20 38 3.10
30 27 2.70
40 16 2.10
50 12 1.8
60 7.5 1.3
70 5.6 1.05
80 3.8 0.75
90 3.0 0.60
100 2.2 0.45
110 1.6 0.35
120 1.2 0.25
These are for an earlier Ford but i don't think they changed the sensor range.
Should apply to the water temp and air temp sensor but not the gauge sensor.
Jim
--------------------------------------------------
From: "Hamish Freeman" <[email protected]>
Sent: Wednesday, March 14, 2012 2:46 PM
To: <[email protected]>
Subject: RE: [Quantum Owners] Re: Low Reading Temperature Gauge
> Yes that is what I thought so I tested each of the sensors to see what
> happened with temperature. The gauge sensor is, as stated, a "straight
> forward" thermistor but the ECU sensor is designed to switch from high
> resistance to low resistance at ~ 40°C to ensure that the ECU switches from
> the "Cold Map" to the "Hot Map" at the earliest opportunity to save both on
> economy and the generation of HC. This device also has a high level of
> hysteresis built in to ensure that the system does not accidentally switch
> back to the "Cold Map" should the engine undergo some freak overcooling - I
> had to immerse the switch in cold water to get it to switch back after
> heating whilst the transition from high to low resistance takes place over
> about 5°C around 40°C. I was surprised at this response so I checked this
> three times and the above characteristics were repeated each time.
>
> Whilst the car is not suffering from poor performance, I will check the
> inlet manifold temperature sensor as I had forgotten that! Thanks for the
> tip!
>
> This really is a matter of having everything working properly and giving
> readings that are believable. A low reading temperature gauge is more of a
> distraction than anything else as it is not calibrated in any scale but if
> it is not indication in the right region I start to wonder if anything is
> wrong.
>
> The worst thing in that respect is the speedo on Trish's Micra, which reads
> ~9.8% high. We complained to Nissan shortly after we bought it to receive
> the reply "If it is within 10% then it is legal and we are not going to
> change it!". Since the speedo is driven by the ECU and recalibration is
> simply a number change in the ECU via the device they use to reset the
> service interval, I was not impressed. After last year when they charged us
> 50% more for the last service done under the guarantee and only completed
> half of it as well as cross threading the sump plug (for which they tried to
> put the blame on me whilst they are the only people to have touched it) and
> not finding the air-con pipe that had worked its way loose, we will not be
> returning to that garage, even to keep the computer record up to date.
>
> Hamish
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> On Behalf Of ChrisC
> Sent: 14 March 2012 13:49
> To: Quantum Owners Group
> Subject: [Quantum Owners] Re: Low Reading Temperature Gauge
>
> On both the CVH and the Zetec engines, the gauge sender and the ECU sensor
> are totally separate; not sure what you mean by an ECU switch? they are
> both thermistors (resistors which decrease in value with applied
> temperature).
>
> Just a temperature gauge reading alone shouldn't affect economy.
> On mine, you can see/hear the idle speed drop in one jump as the engine
> warms up, which indicates that the coolant temperature sensor is working.
>
> I had an issue with poor low-revs acceleration on my CVH-engined H4 (a flat
> spot about 1800 rpm) - replacing the intake manifold air temperature sensor
> seems to have helped significantly, although there is still a little
> hesitation when the engine is warmed up.
>
> Chris
>
>
>
>
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IMPORTANT NOTE: All information presented herewith is provided on an "As Is"
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preparation of the above information shall have any liability to any person or
entity with respect to liability, loss, or damage caused or alleged to be
caused directly or indirectly by the instructions contained within this or
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