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Thermostat I.D. sensors. What do what?


bazeng
work in progress


Galant VR-4 org Post #: 232207 posted 06/30/05 07:37 PM     Remind Me!  Send Private Message   Edit Post      
hey guys
can anybody identify the sensors?

(WHAT EACH SENSOR IS FOR)

thanks





1.
2.
3.
4.

thanks
(just want to know what i can get rid of)



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Jason G.
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Galant VR-4 org Post #: 232217 posted 06/30/05 08:27 PM     Remind Me!  Send Private Message   Edit Post      
The #1 single prong one is for the gauge in the dash.
One of the 2 prong ones is for the ECU and the one on the top above the t-stat (#4) is for the AC.

The US models only have those 3, so I'm not sure what your #3 sensor is used for.

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Galant VR-4 org Post #: 232222 posted 06/30/05 08:33 PM     Remind Me!  Send Private Message   Edit Post      
One of the single wire connectors is for the gauge and one will turn both fans on high speed if the vehicles temperature exceeds 225*F. I'm not 100% sure on the temperature but that's what it does. If you ground the wire that goes to it then both your fans will go on at high speed immediately.

John



"...if they're so into masochism, they should just really go all out and start modifying Mitsubishis. And using them as daily drivers." - Mike R.

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bazeng
work in progress


Galant VR-4 org Post #: 232227 posted 06/30/05 08:58 PM     Remind Me!  Send Private Message   Edit Post      
would these single wire sensors be the same?
ie. if i were use either plug for either sensor, would they both give the same values?

or is each sensor (single wire) specific?



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atc250r Galant VR4.org Moderator
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Galant VR-4 org Post #: 232229 posted 06/30/05 09:05 PM     Remind Me!  Send Private Message   Edit Post      
No they are different. The one that goes to the gauge changes resistance as temperature changes and the fan switch simply grounds the wire when it sees a certain temperature. I had those two crossed when I first bought my car and installed a new engine. The car wouldn't start with the wires crossed. It doesn't make sense but that's what happened. The one on the back of the thermostat housing is for the fans.

John



"...if they're so into masochism, they should just really go all out and start modifying Mitsubishis. And using them as daily drivers." - Mike R.

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Jason G.
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Galant VR-4 org Post #: 232234 posted 06/30/05 09:19 PM     Remind Me!  Send Private Message   Edit Post      
IIRC, the switch to turn the fan on is in the lower right side of the radiator. I only have 3 sensors on my t-stat housing.

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bazeng
work in progress


Galant VR-4 org Post #: 232236 posted 06/30/05 09:26 PM     Remind Me!  Send Private Message   Edit Post      
the thing is they both have the same threads!
yikes!!

what to do now, on of them is longer than the other...
one is about 1cm long (cylinder shape)
the other is about 2cm's long (cylinder + a rounded piece on the end..

is there anyway to identify?

multimetre i guess?



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Galant VR-4 org Post #: 232238 posted 06/30/05 09:30 PM     Remind Me!  Send Private Message   Edit Post      
Yeah, I wish I could help you there but I'd guess a multimeter is your best bet. Jason, the regular fan switch is in the bottom of the radiator but the one on the t-stat housing is more of an emergency switch where if all else fails that should turn all the fans on high. When the resistor went bad in each of my GVR4's the only time the fans would come on is when that sensor turned them on. The scary thing is that the stock temp gauge is such a POS that it never really went much higher than normal when that happened .

John



"...if they're so into masochism, they should just really go all out and start modifying Mitsubishis. And using them as daily drivers." - Mike R.

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3Diamond
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Galant VR-4 org Post #: 232289 posted 07/01/05 03:57 AM     Remind Me!  Send Private Message   Edit Post      
Ok some of the US cars came with a vacuum switch as well, but thats beyound point.

ECU Sensor:


Gauge sender (one that shows temp):


Fan temperature Switch:


The AC swithch is the one on top. Couldnt find a pic of it. The fan switch is also present at the bottom of your radiator. IIRC there are four fan speed controls for 2 fans. One is on/off by rad switch; second on/off by AC on/off; third should be HIGH by ecu; and the final is the emergency by that switch, as someone else said it turns both fans on full.



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bazeng
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Galant VR-4 org Post #: 232332 posted 07/01/05 08:39 AM     Remind Me!  Send Private Message   Edit Post      
great!
thats what i needed..
thanks for that



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Jason G.
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Galant VR-4 org Post #: 232460 posted 07/01/05 03:38 PM     Remind Me!  Send Private Message   Edit Post      
Hmmm, I don't have the 4th sensor on my car. Hell, I don't even have wiring for it. Not that it matters that much since my fan is hard wired anyway.]

Edit: I do have a vac fitting like above in what looks like to be where the fan switch is.


Edited by Jason G. (07/01/05 03:41 PM)

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3Diamond
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Galant VR-4 org Post #: 232538 posted 07/01/05 08:57 PM     Remind Me!  Send Private Message   Edit Post      
Vac fitting should be for EGR valve (unless its a cali car, in which case its a solenoid from ECU).



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crucible
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Galant VR-4 org Post #: 232553 posted 07/01/05 09:48 PM     Remind Me!  Send Private Message   Edit Post      
There's always been confusion on what the hell is what.
The sensor in the back(facing firewall) is the "emergency" switch that turns both fans on high.
The front has 3 sesnors.The bottom left is the ECU sensor(2 wires).Next to this sensor(right) is the temp guage(single wire).Above the ECU sensor facing forward toward the radiator is the EGR vac switch.The switch facing upward on the top of the thermo housing is the A/C switch.
Nuts!

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Galant VR-4 org Post #: 232568 posted 07/01/05 11:46 PM     Remind Me!  Send Private Message   Edit Post      
Cruce hit it dead on! There cannot be any confusion after that unless the non USDM cars are different.

John



"...if they're so into masochism, they should just really go all out and start modifying Mitsubishis. And using them as daily drivers." - Mike R.

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Tom_N
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Galant VR-4 org Post #: 232605 posted 07/02/05 09:45 AM     Remind Me!  Send Private Message   Edit Post   
The hose fitting next to the sensor marked #2.
Where does it go to?


:edit: never mind it goes to the liquid oil cooler that i no longer have.


Edited by Tom_N (07/02/05 10:05 AM)

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