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[Solved] Fiat Seicento 1.1 MPI 2005: Radiator Fan Not Turning On, Testing Computer & Relay Efficiency

patgaw 6393 11
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16361935
    patgaw
    Level 13  
    Hello
    I have a problem with the fan not turning on in the Fiat seicneto 1.1mpi 2005. The fan is controlled by a computer via a relay.
    The fan is working, I do as in this video: https://www.youtube.com/watch?v=10vwPcUHPnc&t=2s and turns on. The relay looks efficient, ticks after applying voltage, I will check it thoroughly, but I exclude it initially.
    Is it possible to check the computer somehow in this respect?
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  • #2 16361962
    wojtek1234321
    Level 36  
    patgaw wrote:
    The relay looks efficient, ticks after applying voltage, I will check it thoroughly, but I exclude it initially.

    Well, "tick" and maybe "ticks", but does it "transmit", "transfer" voltage, (spent switching contacts burned out), i.e. does it turn on the circuit? It is best to replace the efficient one such a relay and then you will be sure whether good or damaged (yours).
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  • #3 16362028
    jdubowski
    Tube devices specialist  
    patgaw wrote:
    Is it possible to check the computer somehow in this respect?


    But why? If the relay did not tick, you could check, and if it ticks, it means that the controller is supplying power to the coil.
    The motor to be checked (corrosion often stops the shaft), relay, fuse and connections.

    BTW - at this time of year, the conditions forcing the fan to switch on are rare.

    Added after 3 [minutes]:

    patgaw wrote:
    Is it possible to check the computer somehow in this respect?


    But why? If the relay did not tick, you could check, and if it ticks, it means that the controller is supplying power to the coil.
  • #4 16362075
    patgaw
    Level 13  
    wojtek1234321 wrote:
    patgaw wrote:
    The relay looks efficient, ticks after applying voltage, I will check it thoroughly, but I exclude it initially.

    Well, "tick" and maybe "ticks", but does it "transmit", "transfer" voltage, (spent switching contacts burned out), i.e. does it turn on the circuit? It is best to replace the efficient one such a relay and then you will be sure whether good or damaged (yours).


    As I said, I will check it more carefully.




    jdubowski wrote:
    patgaw wrote:
    Is it possible to check the computer somehow in this respect?


    But why? If the relay did not tick, you could check, and if it ticks, it means that the controller is supplying power to the coil.
    The motor to be checked (corrosion often stops the shaft), relay, fuse and connections.

    BTW - at this time of year, the conditions forcing the fan to switch on are rare.

    .



    But it ticks when connected to a battery :D I did not test in the car but I would rather not hear it. I tested the car at a standstill, reached 96 degrees and turned off because I did not want to overheat. At what temperature should the fan turn on?


    Quote:

    The motor to be checked (corrosion often stops the shaft), relay, fuse and connections.


    the fan works as I wrote
  • #5 16362187
    jdubowski
    Tube devices specialist  
    patgaw wrote:
    But it ticks when connected to a battery :D I did not test in the car but I would rather not hear it.


    If you add a bulb attached to the relay contacts to the test, you'll see its efficiency.

    patgaw wrote:
    I tested the car at a standstill, reached 96 degrees and turned off because I did not want to overheat.


    To overheat a little bit, this is not Syrena where the cooling circuit was open.
    The car was boiling in the summer that you started to study the subject?
  • #6 16363826
    patgaw
    Level 13  
    It was not boiling because the steel in the cork was low and the thermostat is broken too and it is open all the time. But one day I left him for a longer time and he boiled and the liquid dumped me. So I checked the fan and it could not even be turned off. So I replaced it, but it still doesn't turn on even though it's functional.
    Tell me how to check this computer if it gives a signal to the relay. I found a diagram and let's say I know which pin it is. And now how do I put a multimeter probe to this pin how is it on a large plug that is on all pins? The second tip of the multimeter to ground probe gives you yes?
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  • #7 16364197
    wojtek1234321
    Level 36  
    patgaw wrote:
    I was not cooking because the steel in the cork was low and the thermostat is broken too and it is open all the time.

    How do you turn on the fan when you have the thermostat open all the time, that is, do you always have a circulation on a "large circuit", after all, then you have all the time the circulation for the radiator and the engine is still rather underheated and not overheating, the heating is then barely heats.

    Added after 2 [minutes]:

    patgaw wrote:
    And now how do I put a multimeter probe to this pin how is it on a large plug that is on all pins?

    "Plug" with a pin into the cable that goes to this pin through the insulation of this cable, or check how it is on the other end of this cable and measure there.
  • #8 16365497
    patgaw
    Level 13  
    Okay, let's say I measure at the other end, i.e. in the socket where the relay sits.
    It looks like the attachment, pins 85 and 86 is the control of the coil that goes from the ECU. 86 is a plus that goes from the ECU, and 85 is a minus so I understand that it is connected to mass yes? So how do I want to measure them separately to see if any cable is damaged, can I put one multimeter probe to 86 and the other to ground? and the same for one probe up to 85 and the other for the plus on the battery?
    Attachments:
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  • #9 16365527
    jdubowski
    Tube devices specialist  
    patgaw wrote:
    86 is a plus that goes from the ECU, and 85 is a minus so I understand that it is connected to mass yes?


    If you have analyzed the wires? Because it can also be that 86 is permanently + 12V and 85 goes to the ECU.
  • #10 16367682
    patgaw
    Level 13  
    I am asking someone to explain to me how to measure it :D
  • #11 16367689
    andrzej20001
    Level 43  
    patgaw wrote:
    So I checked the fan and it could not even be turned off. So I exchanged him

    And the maxi fuse behind the battery ??
  • #12 17050747
    patgaw
    Level 13  
    A bit stupid but it turned out that the fan in seicento mpi turns on at 97 degrees and as above you can read until I got to 96 :D there was not much ...
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Topic summary

The discussion revolves around a malfunctioning radiator fan in a 2005 Fiat Seicento 1.1 MPI, which is not activating despite the fan being functional when tested externally. The fan is controlled by a relay and an ECU. Users suggest checking the relay's ability to transmit voltage, inspecting the motor for corrosion, and verifying the fuse and connections. The fan is noted to activate at 97 degrees Celsius, which is a critical temperature for operation. The author seeks guidance on how to test the ECU's signal to the relay using a multimeter, specifically how to measure voltage at the relay pins. Additional troubleshooting steps include checking the maxi fuse and ensuring proper wiring connections.
Summary generated by the language model.
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