FAULT, PHASE ERROR. Brutale 800 - MVAgusta.net
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post #1 of 28 (permalink) Old 08-06-2019, 02:17 AM Thread Starter
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FAULT, PHASE ERROR. Brutale 800

I've got a '16 model Brutale which usually takes at least 2 tries to start when I haven't ridden it for a few days.
This morning it was very stubborn, when it did give a kick, I got the error code- FAULT, PHASE ERROR.

When I did get it running it wouldn't idle and felt like it was only running on two cyls. but all pipes were hot.
or the timing was out (more likely), as it also backfired once.

Could this be a Crank Angle Sensor ?
Is this located at the bottom cam sprocket ?
The bike has 30k on it with no previous problems.
New battery 2 weeks and 500klms ago.

Thanks for any help.

2016 Brutale 800

Currently in the shed: XV750 Custom Cafe, SWM SuperDual X. 1974 Honda CL450. Yamaha IT175 J.
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post #2 of 28 (permalink) Old 08-06-2019, 03:59 AM
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Impressive stable you have there.
Looks like you are about to get the infamous starter sprag failure. If you do a search through this section, I am sure you will find many threads about multiple attempts to start, leading to phase sensor error due to the ecu getting confusing signals about the crank rotation angle.

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post #3 of 28 (permalink) Old 08-06-2019, 05:37 AM Thread Starter
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Yes, I read those posts, mine turns over just as fast as it always has, but nobody mentioned that their bike ran rough after it started.
Mine won't idle and is all over the place when I turn the throttle.

2016 Brutale 800

Currently in the shed: XV750 Custom Cafe, SWM SuperDual X. 1974 Honda CL450. Yamaha IT175 J.
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post #4 of 28 (permalink) Old 08-06-2019, 06:08 AM
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Does it clear up if you shut it off, key off, and then try again?

The crank angle sensor (crankshaft position sensor - rpm sensor) is in the left engine case cover at the crankshaft.
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post #5 of 28 (permalink) Old 08-06-2019, 06:18 AM Thread Starter
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The fault clears if the bike is left off for about 10 mins.
No fault showing while the engine is cranking, as soon as it fires the fault shows on the screen.

I was just looking through the manual for the resistance values on the crank angle sensor, can't find the table.

2016 Brutale 800

Currently in the shed: XV750 Custom Cafe, SWM SuperDual X. 1974 Honda CL450. Yamaha IT175 J.

Last edited by one67; 08-06-2019 at 06:41 AM.
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post #6 of 28 (permalink) Old 08-06-2019, 06:41 AM
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Check the sensor resistance per the manual....and don't forget insulation to ground!!! The manual doesn't mention that, but a short to ground is more common failure mode than a change of resistance. The resistance test won't reveal a short.

I doubt the air gap is changed. Also look closely at the connector to the harness.

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post #7 of 28 (permalink) Old 08-06-2019, 09:28 AM
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Quote:
Originally Posted by one67 View Post
I've got a '16 model Brutale which usually takes at least 2 tries to start when I haven't ridden it for a few days.
This morning it was very stubborn, when it did give a kick, I got the error code- FAULT, PHASE ERROR.

When I did get it running it wouldn't idle and felt like it was only running on two cyls. but all pipes were hot.
or the timing was out (more likely), as it also backfired once.

Could this be a Crank Angle Sensor ?
Is this located at the bottom cam sprocket ?
The bike has 30k on it with no previous problems.
New battery 2 weeks and 500klms ago.

Thanks for any help.
ignore that fault code if only appears on start up, its caused by low battery voltage while starting.

Time to change the battery.
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post #8 of 28 (permalink) Old 08-06-2019, 03:32 PM
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Quote:
Originally Posted by one67 View Post
I was just looking through the manual for the resistance values on the crank angle sensor, can't find the table.
In the chassis manual:
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post #9 of 28 (permalink) Old 08-06-2019, 04:30 PM Thread Starter
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Quote:
Originally Posted by dudman View Post
ignore that fault code if only appears on start up, its caused by low battery voltage while starting.

Time to change the battery.
In my first post I mentioned that the battery was new and the error appears after the bike has fired up.

2016 Brutale 800

Currently in the shed: XV750 Custom Cafe, SWM SuperDual X. 1974 Honda CL450. Yamaha IT175 J.
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post #10 of 28 (permalink) Old 08-06-2019, 04:46 PM Thread Starter
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Quote:
Originally Posted by esq'z me View Post
In the chassis manual:
Ahh, thanks for that.

Dopey me was looking in the engine electrical components section.

2016 Brutale 800

Currently in the shed: XV750 Custom Cafe, SWM SuperDual X. 1974 Honda CL450. Yamaha IT175 J.
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