Help identifying this sensor

1. user_40784 Saxperience Forum Bum Joined: Jan 2010 London Posts: 2768

   #1 17th September 2010, 12:31

   Anyone know what this blue sensor does? its highlighted in red:
   
2. Aly Saxperience Addict Joined: Apr 2007 Sunderland Posts: 10341

   #2 17th September 2010, 13:08

   Quote:

   Originally Posted by johnr32 Anyone know what this sensor does? its highlighted in red:

   Isn't that the thermostat?
3. Tontsy Saxperience Addict Joined: Oct 2008 Plymouth, Fiddling - under a two poster ramp Posts: 14064 Audi

   #3 17th September 2010, 13:16

   Engine/coolant temp sensor iirc
4. user_40784 Saxperience Forum Bum Joined: Jan 2010 London Posts: 2768

   #4 17th September 2010, 14:22

   Quote:

   Originally Posted by tonto_VTR Engine/coolant temp sensor iirc

   Is that temp sensor for the dashboard display?
5. Stevo123 Established Member Joined: Apr 2009 Redcar Posts: 1971 2000 Posi Blue vtr

   #5 17th September 2010, 19:43

   Blue one is dash guage I think - why not get car up to temp and pull the plug off it? You should see the guage react by going right up or right down, I can not rememebr which way!
6. Bensvts Frequent Poster Joined: Feb 2010 maidenhead Posts: 923 Track Itb'd Mk1 Vts

   #6 17th September 2010, 23:33

   yep most certain it is for the temp gauge in side the car

   1 user thanked this post: user_40784
7. user_40784 Saxperience Forum Bum Joined: Jan 2010 London Posts: 2768

   #7 18th September 2010, 13:53

   Quote:

   Originally Posted by Stevo123 Blue one is dash guage I think - why not get car up to temp and pull the plug off it? You should see the guage react by going right up or right down, I can not rememebr which way!

   When i unscrew the sensor from the thermostat the fan just kicks in...
   
   

   Quote:

   Originally Posted by Bensvts yep most certain it is for the temp gauge in side the car

   Cheers Ben
   
   
   edit: Have just changed this sensor but the temp guage is still playing up. (needle starts from middle when cold and drops to the bottom when hot and stays down there.)
8. Stevo123 Established Member Joined: Apr 2009 Redcar Posts: 1971 2000 Posi Blue vtr

   #8 19th September 2010, 11:09

   Oh mann! gotta be the guage I guess. Damn cars eh!
9. dt_ Regular Poster Joined: Sep 2006 Huddersfield Posts: 393 Zx volcane td Peugeot 205 1600 auto

   #9 20th September 2010, 18:42

   that sensor is both the engine temp sensor and the gauge sender, on saxos it does both
10. Bensvts Frequent Poster Joined: Feb 2010 maidenhead Posts: 923 Track Itb'd Mk1 Vts

    #10 20th September 2010, 20:51

    Quote:

    Originally Posted by johnr32 When i unscrew the sensor from the thermostat the fan just kicks in... Cheers Ben edit: Have just changed this sensor but the temp guage is still playing up. (needle starts from middle when cold and drops to the bottom when hot and stays down there.)

    Has anyone mest around with the dash inside e.g. had it out to change bulbs etc because sounds like the gauge has been put in wrong inside the car if its reading half way when stone cold and goes to the bottom when at running temp
11. user_40784 Saxperience Forum Bum Joined: Jan 2010 London Posts: 2768

    #11 20th September 2010, 22:17

    Quote:

    Originally Posted by Bensvts Has anyone mest around with the dash inside e.g. had it out to change bulbs etc because sounds like the gauge has been put in wrong inside the car if its reading half way when stone cold and goes to the bottom when at running temp

    you having the same problem aswell ben?
12. user_15516 Saxperience Post Whore Joined: Apr 2007 Posts: 6640 Integra DC5R & VTS

    #12 20th September 2010, 22:25

    Does the blue one not measure coolant temp for the ECU, and the green one screwed into the head is for the gauge on the dash?
13. user_40784 Saxperience Forum Bum Joined: Jan 2010 London Posts: 2768

    #13 21st September 2010, 00:31

    Quote:

    Originally Posted by LeeumH Does the blue one not measure coolant temp for the ECU, and the green one screwed into the head is for the gauge on the dash?

    not sure, everyone on this forum has been saying the blue one is for the dash display.
14. user_15516 Saxperience Post Whore Joined: Apr 2007 Posts: 6640 Integra DC5R & VTS

    #14 21st September 2010, 18:54

    Quote:

    Originally Posted by johnr32 not sure, everyone on this forum has been saying the blue one is for the dash display.

    If the fan comes on when you unplug the blue sensor, I'd probably go with that one being the coolant temp sensor for the ECU.
15. baker556 Saxperience Forum Bum Joined: Mar 2007 127.0.0.1 Posts: 4826 oem+ sax

    #15 21st September 2010, 19:18

    I thought it was the green one.
    
    I had this problem so changed both now everything works !
16. user_40784 Saxperience Forum Bum Joined: Jan 2010 London Posts: 2768

    #16 21st September 2010, 21:38

    the blue one is definately for the ecu then as fan kicks in when its removed, so the green one is certainly for the dashboard display?
    
    edit: where is this green sensor? the only green sensor i see is the one that leads to the top of the exhaust manifold heat shield.
17. user_10473 Saxperience Forum Bum Joined: Jun 2006 Swansea Posts: 4946 Bianca White Peugeot 106 S2 Rallye, Saxo VTS

    #17 21st September 2010, 21:53

    The blue is a sensor. It controls the ecu and the gauge.
    
    The green is, for what it's worth, a switch. It closes when the temp gets really hot and turns on your warning light.
    
    
    But, depending on the age and model, some used both, some used one. There are two really really good guides in the articles section that are well worth premium membership for.
18. user_40784 Saxperience Forum Bum Joined: Jan 2010 London Posts: 2768

    #18 23rd September 2010, 23:50

    Quote:

    Originally Posted by Mr_P The blue is a sensor. It controls the ecu and the gauge. The green is, for what it's worth, a switch. It closes when the temp gets really hot and turns on your warning light. But, depending on the age and model, some used both, some used one.

    Mines a later 3 plug ecu VTR so would the blue one control both the ECU and temperature guage?
19. Tilen Newbie Joined: Jan 2009 Slovenia Posts: 8 Saxo 1.1 2001

    #19 19th January 2011, 22:36

    has anybody solve this problem? I have the same problem. temperature gauge shows half when it's cold and zero when it's on working temperature. Sensor works fine, i guess that must be gauge problematical.
20. Railroader Established Member Joined: Dec 2009 Bolton Posts: 1068 Saxo 1.4i sx

    #20 19th January 2011, 23:09

    I always thought that the green one was for the ecu. In fact this last week I have been swapping green ones and noticing the difference in how it runs- misfire cured. In my single plug the green is defininately for the ecu and engine
21. Railroader Established Member Joined: Dec 2009 Bolton Posts: 1068 Saxo 1.4i sx

    #21 19th January 2011, 23:13

    Quote:

    Originally Posted by johnr32 the blue one is definately for the ecu then as fan kicks in when its removed, so the green one is certainly for the dashboard display?

    Why do you think that the fan is connected to the ECU?
22. Railroader Established Member Joined: Dec 2009 Bolton Posts: 1068 Saxo 1.4i sx

    #22 19th January 2011, 23:16

    double post, anybody know how to delete them?
23. Tilen Newbie Joined: Jan 2009 Slovenia Posts: 8 Saxo 1.1 2001

    #23 20th January 2011, 09:03

    the best way to figure out is to disconect one by one, when is disconected and you start the engine, gauge must show zero, in my case for gauge is this sensor which starts the fan when i disconect it. But still I think that the problem is in the gauge.
24. user_40784 Saxperience Forum Bum Joined: Jan 2010 London Posts: 2768

    #24 20th January 2011, 11:00

    I changed the blue sensor and that didnt fix it.. doesnt bother me really as I know my radiator/coolant pipes/coolant/water pump/thermo/engine is all good, no leaks etc.
25. Tilen Newbie Joined: Jan 2009 Slovenia Posts: 8 Saxo 1.1 2001

    #25 20th January 2011, 12:29

    johnr32 when did you notice that your gauge is not working like it should... I have my problems because i change dials from another saxo, my didn't have temperature gauge.
26. sivts L-plater Joined: Sep 2010 Posts: 35

    #26 20th January 2011, 12:37

    i have no spark on my mk1 vts engine just put a new crank sensor on it aswell anyone who can help me will be much appriciated thanks
27. user_40784 Saxperience Forum Bum Joined: Jan 2010 London Posts: 2768

    #27 20th January 2011, 12:41

    Quote:

    Originally Posted by Tilen johnr32 when did you notice that your gauge is not working like it should... I have my problems because i change dials from another saxo, my didn't have temperature gauge.

    It was like that when I bought it but didnt really notice it until I was driving home. My money is on a dodgy connection behind the dash...theres a guide on here to get to the dash but dont have the time
28. Tilen Newbie Joined: Jan 2009 Slovenia Posts: 8 Saxo 1.1 2001

    #28 20th January 2011, 12:54

    so its all on me i will try to solve something, i dont know yet how but i hope i will, I will post here if I find something