Temperature gauge & sensors / senders / switches - Toyota Nation Forum : Toyota Car and Truck Forums


» Auto Insurance
» Featured Product
Advertisement
Wheel & Tire Center

Go Back   Toyota Nation Forum : Toyota Car and Truck Forums > Toyota Passenger and Sports Car Forums > Camry and Solara Forum > 3rd & 4th Generation (19921996 & 19972001)

3rd & 4th Generation (19921996 & 19972001) Toyota Camry Discussion for years: 1992-1996 & 1997-2001 Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

ToyotaNation.com is the premier Toyota Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 07-08-2012, 08:21 PM   #1 (permalink)
New TN User
 
Join Date: Apr 2011
Location: United States
Posts: 17
Thanks: 7
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View DogToggler's Photo Gallery
Question Temperature gauge & sensors / senders / switches

I've browsed a lot of other threads on this stuff but I'm still a little lost.

I've got a '95 2.2L/LE sedan/auto and the temperature gauge pins as soon as the key is in on position (even with engine completely cool).

For some reason, on extended trips it starts to slowly go down until it settles to display a normal running temp.

Rock Auto puts the temperature sensor and temperature sender under the same section... don't these serve two distinct purposes? Correct me if I'm wrong: one of them sends coolant temp info to the gauge, and the other serves to switch the radiator fans on/off. Which one should I be looking at for my gauge issue?

And what is its location? I read that it should be near the thermostat, but I don't see anything that looks like this piece over there. Is it one of the pieces in the picture below (on or near the water exit block)?

DogToggler is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 07-08-2012, 09:31 PM   #2 (permalink)
イリジウム
 
Join Date: Apr 2009
Location: Calif
Posts: 8,023
Gameroom cash: $960430
Thanks: 191
Thanked 902 Times in 853 Posts
Supreme Member
iTrader Score: 0 reviews
View JohnGD's Photo Gallery
The gauge "sender" is the one-wire one. The sensor for the ECU is the two-wire one.
JohnGD is offline   Reply With Quote
The Following User Says Thank You to JohnGD For This Useful Post:
DogToggler (07-09-2012)
Old 07-08-2012, 10:00 PM   #3 (permalink)
BMR
Deputy of Mayberry
 
BMR's Avatar
 
Join Date: Dec 2007
Location: Colorado
Posts: 5,504
Gameroom cash: $909653
Thanks: 137
Thanked 958 Times in 853 Posts
Lifetime Supreme Member
iTrader Score: 2 reviews
View BMR's Photo Gallery
There are actually three coolant temperature sensors.

1) The ECT which feeds the ECU. That one's in your picture; the one on the left with the green connector on it.

2) The fan sensor, or more accurately, switch. On the 4 cylinder, it's mounted in the radiator at the bottom on the passenger side.

3) The sensor the gauge uses. Not sure where it is on the 4 cyl, but I *think* it's in your pic, the one next to the green one.
__________________
1992 Camry LE, V6 (3VZ-FE), ABS brakes, dark emerald pearl, owned since new. Replaced HGs @332k, now at 363k miles
1996 Avalon XLS, ABS brakes, super white II, acquired w/ 139k, now at 303k
2001 Yamaha FZ1, Ivan's jet kit, resprung, Ohlins rear shock, Race Tech cartridge emulators in forks, 49k
BMR is offline   Reply With Quote
The Following User Says Thank You to BMR For This Useful Post:
DogToggler (07-09-2012)
Old 07-08-2012, 10:07 PM   #4 (permalink)
Official TN Member
 
SwampFox's Avatar
 
Join Date: Jan 2004
Location: Delaware
Posts: 102
Thanks: 2
Thanked 8 Times in 8 Posts
iTrader Score: 0 reviews
View SwampFox's Photo Gallery
If this is an image of your engine, then the aluminum appears corroded. I would guess this is from traveling on salted winter roads? Is it possible that the temperature sender / connection fitting is loaded up with corrosion salts, is damp with moisture and then grounds / shorts the temperature sender / connection fitting interface?
__________________

1994 Camry V6 SE Coupe
SwampFox is offline   Reply With Quote
The Following User Says Thank You to SwampFox For This Useful Post:
DogToggler (07-09-2012)
Old 07-09-2012, 10:35 AM   #5 (permalink)
New TN User
 
Join Date: Apr 2011
Location: United States
Posts: 17
Thanks: 7
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View DogToggler's Photo Gallery
Thanks for your help everyone.

Yes, it could most definitely be a corrosion issue, I live in the northeast. I popped one of these connectors off (without knowing whether it was the right one) just to see how the contact components looked. They didn't appear as bad as the exposed components seen in the photo, but I'm not ruling it out.

I will probably just replace it since it is a relatively cheap part. I'm hoping it is not the gauge itself, but the fact that it settles down on long trips makes me think it might be on the sensor side.

The car had some traumatic cooling system issues in the past that may have affected this and other components .
DogToggler is offline   Reply With Quote
Old 07-09-2012, 08:50 PM   #6 (permalink)
Senior TN Member
 
Join Date: Aug 2011
Location: Montreal, Quebec, Canada
Posts: 1,611
Gameroom cash: $337295
Thanks: 118
Thanked 191 Times in 161 Posts
iTrader Score: 2 reviews
View CrystalMethod's Photo Gallery
The sensor would be the cheapest and easiest thing to replace (it's just a thermal resistor). But, if it's reading high at the sensor, your rad fan should be constantly running. If that isn't happening, I'd start looking somewhere else, other than the sensor.
CrystalMethod is offline   Reply With Quote
Old 07-12-2012, 11:29 PM   #7 (permalink)
New TN User
 
Join Date: Apr 2011
Location: United States
Posts: 17
Thanks: 7
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
View DogToggler's Photo Gallery
Follow up: Luckily this was the correct sensor I got off a 5sfe at the junkyard even though I wasn't sure. I removed my defective one (17mm deep socket) and immediately saw the problem. The 'thermowell' part of the sensor was deformed with a nice hole in one side:



This must have been a result of the traumatic cooling system issues I previously mentioned. Let's just say things got pretty hot on a couple of occasions. Fixed leaks, new thermostat, radiator cap etc. but I guess this was some collateral damage. I should probably replace the other sensor for the ECU as well.

Quote:
Originally Posted by CrystalMethod View Post
The sensor would be the cheapest and easiest thing to replace (it's just a thermal resistor). But, if it's reading high at the sensor, your rad fan should be constantly running. If that isn't happening, I'd start looking somewhere else, other than the sensor.
As previously mentioned, the fans are controlled by a temp. sensing switch on the radiator. As a precaution while my gauge wasn't working, I had the switch unplugged so the fans would always run. I plugged it back in after the repair and let the car idle for a while, but it never got hot enough to see if the fans would turn on automatically.

Last edited by DogToggler; 07-12-2012 at 11:30 PM.
DogToggler is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Toyota Nation Forum : Toyota Car and Truck Forums > Toyota Passenger and Sports Car Forums > Camry and Solara Forum > 3rd & 4th Generation (19921996 & 19972001)

Bookmarks

Tags
gauge , sender , sensor , switch , temperature

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 08:11 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
ToyotaNation.com is an independent Toyota/Lexus enthusiast website. ToyotaNation.com is not sponsored by or in any way affiliated with Toyota Motor Sales, USA, Inc. The Toyota, Lexus and Scion names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.