Quote:
Originally Posted by bruinbear714
Now I'm talking specifically about the fan controller. Generally speaking, with the key out of the ignition, there should be no power at all going to any devices on the engine harness.
No power to fuel injectors, knock sensor, crank angle sensor, maf, coolant temp, oxygen, etc.
This is how the manufacturer designed the wiring. As soon as you put the key on the "ON" position, it activates a relay to the ecu and powers all the engine sensors and electronics.
If anyone has power on any OEM sensor with the key out, there is a wiring problem, most likely due to ecu still being powered with the key out.
Chances are wiring is modified if the chassis has been through an engine swap.
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First, I thought we were talking about the DiF fan controllers.
Second, some manufacturers warn that electric fans may come on any time. The recommendation is to disconnect the negative battery terminal when working near the radiator area.
Third, I didn't know that Nissan uses thermo switch in their clutch fans.
I don't disagree with you completely. It's just that your statement is only correct for certain cars, but not every car.