Phase Sensor Error - MVAgusta.net
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post #1 of 12 (permalink) Old 10-25-2015, 05:08 AM Thread Starter
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Phase Sensor Error

Finished work this morning and had trouble starting, usual checks came up ok and on pressing the starter it was like the battery was struggling to crank it over, then" Phase Sensor" lit up on the dash. Turned if off and tried again and done that another 4 times before she finally kicked into life, each time it ran through the usual checks and always came up OK and a few seconds later the fault came up on the dash.
After it started I had to stop for fuel within 2 miles, after fuelling up it started as normal, on getting home, 24 miles, I put it on a battery checker (BC Bravo) and it came up as 100% charged and alternator pass, with13.9 and 7.1 showing.
Longest the bike has sat without getting ridden is 7 days and started fine, it is normally used everyday.
Yuasa battery will be ordered tomorrow (Monday).
Any ideas what the phase sensor would be monitoring?
Luckily I have a nice MV dealer within a mile of my house so will pop in tomorrow and ask him to whack it on the diagnostics for me to see what's going on and I will post an update.
And no I didn't take a picture of the dash cause I'm an eejit and was just finished a night shift.

Now must get off here before I see a spoiler, Moto GP time.


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post #2 of 12 (permalink) Old 10-25-2015, 05:24 AM
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I suspect you are about to join the starter Sprag clutch club, difficulty starting and then the bike throwing a phase sensor error are the first signs. Tell your dealer to get a replacement on route to you and ensure they order the very latest Sprag.

A well know 3 cyl fault which MV have been trying to sort for at least two years. A better battery is always a good move but the I would also look at getting heavier duty earth, starter and solenoid cables, just made some up for my B800 which I amfitting today, and the TV very soon. Again another MV weak point.

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post #3 of 12 (permalink) Old 10-25-2015, 05:37 AM Thread Starter
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I was hoping you weren't going to say that jimbo 😀 but apparently my old Italia has developed the issue as well.
Since you know what your doing jimbo make a couple of them for me as well and I'll even give you the pleasure of fitting them for me as well hahaha only kidding but since we are in the same county I wouldn't mind popping along for a look when
Your doing your upgrade to the Turismo I'm in Weston jimbo so Tim will be getting a visit tomorrow.

Bruce


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post #4 of 12 (permalink) Old 10-25-2015, 06:19 AM
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I am in WSM as well, been doing a few photos of my heavy duty cable installation on the B800, will post that up in next few days when I have checked my handy work out. It is a fair bit of work involved getting down into the guts of the bike and as everything is so tight a bit of a pain.

Certainly a winter job when you have a few days spare, the only difference between the B800 and the TV will be cable lengths.

Hopefully Tim can get a few sprags in because they need them more frequent than spark plugs!!

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post #5 of 12 (permalink) Old 10-25-2015, 06:52 AM Thread Starter
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Nice, I'll look forward to your how to jimbo, have to be a holiday job for me as its my daily ride, I'll drop in and see Tim in the morning when I finish work and in the mean time I'll have to get the recovery number on speed dial, I don't mind not making work but getting stuck at work is never good.


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post #6 of 12 (permalink) Old 10-25-2015, 07:00 PM
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Sounds like battery to me. One can hope.

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post #7 of 12 (permalink) Old 10-26-2015, 03:37 AM Thread Starter
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Quote:
Originally Posted by Donsy View Post
Sounds like battery to me. One can hope.

It did sound like the battery had been left for a few weeks and was starting to go flat, but when I stopped for fuel 1.9 miles later and under 5 minutes, I know it was that as the clocks had reset, and when I restarted it was like it had been on on a charger all night, no problems at all phase sensor error didn't show. Anyway hopefully an easy fix, did I just say that!


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post #8 of 12 (permalink) Old 10-26-2015, 01:43 PM
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Quote:
Originally Posted by Red800 View Post
It did sound like the battery had been left for a few weeks and was starting to go flat, but when I stopped for fuel 1.9 miles later and under 5 minutes, I know it was that as the clocks had reset, and when I restarted it was like it had been on on a charger all night, no problems at all phase sensor error didn't show. Anyway hopefully an easy fix, did I just say that!
From what I hear the TV's have the old sprag so this is likely not the battery, but the time to get the revised sprag...
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post #9 of 12 (permalink) Old 10-26-2015, 07:46 PM
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Quote:
Originally Posted by Lion View Post
From what I hear the TV's have the old sprag so this is likely not the battery, but the time to get the revised sprag...
I was wondering about that.

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post #10 of 12 (permalink) Old 10-27-2015, 03:26 PM
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Had the phase sensor issue once on the old battery. Never had it since the new one. Never bothered with the cables.

Phase sensor is a timing sensor. The sprag slips it causes the ecu to loose the timing temporarily.

A decent battery and I reckon you'll be all sorted.
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