Anyone replaced one of these?? I have a P-360, speedometer starting acting up last time I rode it, was all over the place, now it dont work at all, & the 4wd/2wd switch does not work.. I already checked out the 2wd/4wd actuator with a ohm meter, was right in spec's acording to my manual, so I'm going to assume it's highly likely the speed sensor since now neither work, just looking for maybe some info & testing it & replacing it if necessary, thanks...

 

This will be a good one for Hayashi to reply on. I am quite sure he will be able to help you with the answer your looking for.

Looking forward to his answer, I enjoy reading his comments,
Mud

 

Uinthas' diagnosis is right on the tract.
When the speedo sensor does not generate signal (in terms of DC voltage), not only the speedometer is malfunctioning, the 2/4WD system is not working also. That's because the 2/4WD engagement/disengagement works in only in certain speed range (0.5-12.0 mph). You can also do the ohm's test on the speedo sensor itself, but let's do the visual inspection first.

Location: As you sit on the quad, the sensor is located near the heel of your right foot mounted on the RH side crankcase.

Inspection: In my experience, the sensor itself is very reliable. However, its location is at very vulnerable place - plastic body gets easily damaged (cracked) or the connector gets easily unplugged.

Removal: Unscrew the 6 mm mounting bolt and pull out the sesnor. Wait! The engine oil will pour out. So, either drain the oil or lean the bike to the LEFT. Once you pull out the sensor, make sure the L shaped sensor is not cracked or anything in the middle. It may have a fine crack that is not so obvious, so wiggle the body and check carefully.

Are you still reading this? OK. If the visual inspection checks out good, now you need to do the voltage signal check. There are 3 wires connected to the sensor:
BRN: +12 VDC
BK/Y: Gnd
P: Signal 0.0-5.0 VDC
You will need a voltmeter. First make sure the BRN and BK/Y wires have what they are supposed to have as above. Then check P wire as following:
Raise the quad and spin the rear wheels, the P wire should generate signal pulses, voltage magnitude and frequency depending on the rotational seed of the rear wheels. It is basically a square wave sign.

You can do the ohm's check as described in the manual, but I like this method better, because it is a dynamic test instead of static.

 

well I think I found the problem, the yellow BK/Y wire just fell off when I took the sensor off, I have only a little stub remaining on the sensor wire harness, should I sauder it or something else?? thanks for the help

 

The BK/Y wire is the ground wire. I would just solder it and save some $$.

 

Solder her back together & she works great now, thanks for the help