Wiring/earthing is highly likely involved ...
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@mike74 wrote:Try connecting a couple of jump leads from engine to battery or chassis, that'll tell you pretty quickly if it's an earth problem as the issue should be better
@johnny gtir wrote:Should not need one start with basic checks and go from there
@Mr B wrote:Check the inputs and earths to the ecu first and also check other sensors for power side signals .
I would assume it more likely fudged wiring, I never seen a ecu circuit issue on coolant sensor but indeed could be .
What I do is with plug off the sensor and couple back probes on the temp pins is bridge probes with a resistor to get cold water value and run the car, If this the reason the fan running the fan will be off as ecu now gets valid input on that sensor circuit.
Only 2 circuits that switch fan is water temp and aircon and as said before when water temp circuit dead the ecu runs a safe mode with a fixed value for water temp and runs fan permanently .
* Do review aircon circuit if fan still runs after water circuit fixed as lot of people make a right mess modding wiring or from removing it.
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