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  1. Ravilious

    Ravilious Member

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    Drives:
    Vaxuhall Astra MK4 2001
    Hello everyone,

    I've been having quite a problem with my temperature gauge in my car, IT JUST DOESN'T MOVE! (fuel gauge works fine)
    I changed my temperature sensor with no luck and I changed my thermostat and still no luck.
    So after having tried this, I assumed there is a fault in the temperature gauge wire which connects to the temperature sensor (if i'm right) by using a circuit tester and its showing no live voltage in the wire.
    This problem is driving me crazy and I just want that needle to move, as this is resulting the fan to constantly stay on and car staying in limp mode.
    I have a also had it checked with a diagnostic machine and the code its giving is P0115.

    Is there a fuse that needs replacing? Why is there no live connection in that temperature wire (blue and brown coloured)

    Any help would be really appreciated as its driving me crazy.

    Regards
  2. Tommo80

    Tommo80 Member

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    As the car warms up put a volt meter on the sensor see if that's getting a reading could be broke from the back of the clock I suppose but not heard of it being common tho!
    Ravilious likes this.
  3. marks152

    marks152 Well-Known Member

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    Location:
    liverpool, uk
    What engine does your car have so I can look it up for you. If your not sure whats your REG number and ill look it up.

    Can you confirm the 5v is missing from the coolant sensor connector.
  4. N871BUD

    N871BUD Well-Known Member

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    Location:
    East London
    Drives:
    now drives a 4 wheel vauxhall
    i doubt is related to clocks, most probably is disconnected faulty or a wiring fault.
    Ravilious likes this.
  5. Ravilious

    Ravilious Member

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    Drives:
    Vaxuhall Astra MK4 2001
    Thanks for the reply Tommo and N871BUD, definitely will give that a go! If there is no reading through the volt meter, could it be a fuse or relay problem? Sorry to sound like such a noob.
  6. marks152

    marks152 Well-Known Member

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    Again. without knowing what engine/REG I cannot look up with wiring diagrams
  7. Ravilious

    Ravilious Member

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    Drives:
    Vaxuhall Astra MK4 2001
    Hi marks152 and thanks for a reply, Sorry I missed your message!
    My Reg is X63 HDT
    Regards
  8. Tommo80

    Tommo80 Member

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    I'd follow the wire an jus check for condition an if there's any breaks in it as a single wire could go brittle easily spec how thin it is too.
  9. marks152

    marks152 Well-Known Member

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    Location:
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    The engine is a Z14XE.

    The 2 wires leading to the temperature sensor are BROWN and BLUE/RED. You should have 5v on the blue/red wire. You need to check the wire from the coolant sensor connector to the ECU connector. Use you multimeter to check this. Its the top ECU connector and its pin 10 you need to check. Here is a pic of the connector. If the wire is not broken then its a defective ECU.

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    Ravilious likes this.
  10. Ravilious

    Ravilious Member

    Messages:
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    Drives:
    Vaxuhall Astra MK4 2001
    Thank you so much for that! I will give that go. When I connect the multimeter to the ECU pin 10 should it read 5v too and If there is a fault with the wire how would I be able to get a replacement for that? Ive had a look online for it but cant seem to find it, maybe I'm using the wrong terminology.
    Thanks again
    Regards

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