Cutting out under acceleration?

[Rotaxmaxracer]

I ride a 2006 GS with 53k on the clock which seems to have developed a strange but somewhat worrying problem.

Had the bike cut out completely on my today - both times under hard acceleration whilst on the wrong side of the road passing cars!

No warning - almost as if the ignition was suddenly switched off, I lose all electrical display, indicators etc and have no choice but to coast back in to the kerb and stop.

All is again ok once the ignition has been switched off and then on again and away we go.

It's happened before but very infrequently, but today it happened twice and is now becoming a concern.

Does anyone have any ideas on this one please?

 

[Schtum]

Dodgy ignition switch....? It might benefit from being scanned for fault codes.

 

[Rotaxmaxracer]

Dodgy ignition switch....? It might benefit from being scanned for fault codes.

Thanks, yes I did wonder about the switch, but it just seems strange that it happens only under hard acceleration? I will take your advice and get the fault codes checked

 

[Popell]

Perhaps hard acceleration is pulling on the wiring up front as the forks extend?
Certainly sound that area if you lose dashboard too.

 

[fizzer]

have you checked battery terminals

 

[Bendy toy]

Also look for chafed wires in the area alongside the battery and check the main earth on top of the engine under alternator.

 

[adventuredon]

I had similar. A new Sidestrand switch was ordered and solved problem. 2010 gs. No errors on 911. Always under hard acceleration.

Sent from my SM-G920F using Tapatalk

 

[Rotaxmaxracer]

Thanks all for the comments and helpful advice. I'll check out the points mentioned and report back ��

 

[Colin1958]

I had the same thing - turned out to be the coil pack.

It's documented in other threads here - the ecu shuts down because a coil is drawing too much current (there's no fuse on the canbus system). A diagnostic computer should narrow the failure down to the component group causing the failure.

 

[Bendy toy]

The ECU can't see the actual coils so will not show a fault code. Diagnosis is from the symptoms that are recorded and others that are not (sooty O2 sensor for e.g.). Anything pulling excess current will trip the canbus "fuse". But a failing coil will do that only once. By then its obvious what's going on.

Mine had both coils partially fail at the same time. Diagnosing that was nightmare. Swapping coils left right had no effect - both were crap but sparking enough to start and run the engine. Eventually one coil stopped working 100%. I replaced that coil with a new OEM (stainless case instead of the old back paint) and all was well. Then the other coil failed on the way home so I had return trip to spend another £80.

 

[Colin1958]

With respect Bendy, the diagnostic computer did show that the cut-out was caused by over-draw of current from an identified component group which included 4 components - the coils, the fuel injectors, and two other components.
We decided that it was unlikely to be anything other than the coils (nothing else was likely to draw that much current), so the coils were swapped out and the bike didn't cut out for the next 5 years.

Then it was stolen.

 

[Bendy toy]

Point taken re canbus faults but the engine ECU does not record coil related faults.

The coils can be working badly bad enough to cause a misfire and even stop the bike but the engine ECU cannot directly see a coil fault. It does pick up other symptoms from which the fault is diagnosed.

For example both of my primary coils were failing but never enough to trip the Canbus so the faults were not recoded electronically.

 

[Mistacat]

The ECU & GS911 can detect problems with the primary winding's of the coils but not the secondary (HT ) side.
If the primary winding's short out then the BMSK will shut that circuit down.