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Louie, Technician
Category: Motorcycle
Satisfied Customers: 11948
Experience:  25+ yrs. experience
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2006 Trx 450r this bike fan does not turn off it's on all

Customer Question

2006 Trx 450r this bike fan does not turn off it's on all the time and the bike turns on but does not idle only with the choke pulled out
Submitted: 4 months ago.
Category: Motorcycle
Expert:  Louie replied 4 months ago.

Hi again and welcome back to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.

Initially, let's try check/review the basics; have you checked and traced the yellow blue wire from the engine coolant temp sensor? ...cxheck fir nicks, rubbed raw insulation, or wire pinched?

And tested the continuity/resistance of the engine coolant temp sensor itself?

Customer: replied 4 months ago.
How much continuity resistance does it need to have ?
Expert:  Louie replied 4 months ago.

The simplest is it should not read 0 nor low and should be relatively high.

More particularly; a good ECT sensor would read 47.5 ~ 56.8 Ω @ 80°C / 80°C and 14.9 ~ 17.3 Ω @ 120°C / 248°C

Customer: replied 4 months ago.
this is with the key on correct ?
Expert:  Louie replied 4 months ago.

Negative. The sensor only by itself even with the wire to it temporarily disconnected.

Customer: replied 4 months ago.
Ok so sensor by itself unplugged correct ?
Expert:  Louie replied 4 months ago.

Yes, the sensor by itself. Its terminal (pin) resistance to body ground.

Customer: replied 4 months ago.
Expert:  Louie replied 4 months ago.

Other than the sensor, it is possible the yellow/blue wire as it may possibly be touching frame ground.

Another possibility if both the wire and sensor checks good would be a controller issue.