Here is a brief video on the method for graphing the Fan Motor Speed.
I have opted for RPM as this is easier to interpret.

I hope this helps, take care.......Steve

Hello and thank you for the feedback The speed signal of the Fan Motor was captured using the Pico Optical Sensor kit https://www.picoauto.com/products/nvh-accessories/optical-sensor-kit Here we place a piece of reflective tape anywhere about the motor armature. The Optical Sensor light beam is then...

Hello Nev, welcome to the forum Please feel free to use all the training and education facilities at your disposal here and also at our website https://www.picoauto.com/ The following links will most certainly help https://www.picoauto.com/library/training https://www.picoauto.com/library/automotive...

I hope this may be of interest as I often thought the restriction of airflow across a typical blower motor (Heater Fan etc.) would result in excessive current draw and hence a blown fuse. This was misunderstanding on my behalf (now clarified) thanks to a recent experiment proving otherwise. Long sto...

Hello Fabio welcome to the forum, thank you for posting and introducing yourself

Your English is fine and we look forward to exchanging knowledge with you on a number of topics

Take care.......Steve

Hello and thank you for taking the time out to post this information. Sharing such knowledge is very generous indeed and will help others in the future no doubt. Like the role we have is not difficult enough, we are now contending with inferior replacement parts, often branded with names we can trus...

Hello and thank you for the feedback. AC Coupling threw me off the scent as at first glance we can clearly see there is a speed signal from the offending Front LH Wheel speed sensor. You can also see this ripple in the DC coupled signal, but using AC coupling improves the vertical resolution. With s...

I want to share a recent diagnostic "journey" that had me chasing my tail until I took the time out to analyse the data. Whilst the vehicle in question has now been resolved I would value any opinions on the theory below: To cut a long story short I attended a local garage requesting support with a ...

Hello and thank you for the feed back I guess this is what we are up against as the cost of diagnosis and repair can exceed all economical sense Interesting point about the PCM control reverting to an "idle" state when battery voltage has recovered and load has been removed. Theoretically yes, but i...

Hello Glenn and thank you for the post. Sorry for the late reply and there are no stupid questions for sure. I think from a stability point of view I would try the current ramp of the ignition primary circuit. Could you follow this Guided Test for connection? https://www.picoauto.com/library/automot...