Electronic suspension failure

13384 Views 25 Replies 7 Participants Last post by Batka, Jul 14, 2019

simplythebest

Discussion Starter · Nov 17, 2018

I had a track day last weekend and after 3 20 min sessions in the 4 session, the bike just popped a crazy wheelie when i opened it up on the straight.
I thought I had DWC in the wrong mode and rode the lap but the bike felt really funny. Some times hard and sometimes soft. After 2 or 3 corners i looked down to see the error messages and slowed down and came into the pits.

Thought it could be a glitch. so let her cool down for an hour. After that I removed the battery connector to see if an ECU reset will fix it. (that why the pic says set date and time)

It didn't. So I went out for a slow lap and the bike was not rideable. Forget DWC DQS and DTC. Just crazy suspension. Even in fixed mode.

I've had quick shifter issues, and my dealership is receiving the part this week. so I said I would get it all checked out together.

Only change I've done is change the front fork oil from 5w to 10w as the front was really soft for me.

Anyone else had this issue?

Thanks.

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Reactions: 2

1 - 20 of 26 Posts

playersnoopy

· #2 · Nov 18, 2018

I've had all the electronics error on me after a crazy wheelie incident; but it was because I slammed the bike down too hard as a result. Came to a light and turned the ignition off/on and it reset itself just fine. Not sure about yours.

SixShock

· #3 · Nov 20, 2018

simplythebest said:
I had a track day last weekend and after 3 20 min sessions in the 4 session, the bike just popped a crazy wheelie when i opened it up on the straight.
I thought I had DWC in the wrong mode and rode the lap but the bike felt really funny. Some times hard and sometimes soft. After 2 or 3 corners i looked down to see the error messages and slowed down and came into the pits.

Thought it could be a glitch. so let her cool down for an hour. After that I removed the battery connector to see if an ECU reset will fix it. (that why the pic says set date and time)

It didn't. So I went out for a slow lap and the bike was not rideable. Forget DWC DQS and DTC. Just crazy suspension. Even in fixed mode.

I've had quick shifter issues, and my dealership is receiving the part this week. so I said I would get it all checked out together.

Only change I've done is change the front fork oil from 5w to 10w as the front was really soft for me.

Anyone else had this issue?

Thanks.

If you change the fork oil, the active suspension will not work correctly. It was designed with the oil weight it came with. This was confirmed by Dave Moss and the shop he tells people to go to for deeper suspension changes.

oleary

· #4 · Nov 23, 2018

SixShock said:
If you change the fork oil, the active suspension will not work correctly. It was designed with the oil weight it came with. This was confirmed by Dave Moss and the shop he tells people to go to for deeper suspension changes.

That's odd, I was just talking to Dave today and he said don't bother changing springs (stock is 1.05) instead change to 10W and 140 mm oil height.

He said you could do a revalve but that would be "for more serious race application".

simplythebest

Discussion Starter · #5 · Nov 25, 2018

oleary said:
That's odd, I was just talking to Dave today and he said don't bother changing springs (stock is 1.05) instead change to 10W and 140 mm oil height.

He said you could do a revalve but that would be "for more serious race application".

Same here. This is the advice I got from Dave. Go to 10w and increase oil by 10mm.

It rode fine on the street getting to the track, and 3 reasonably hot sessions.
Only on the 4th did this happen.
Anyways, waiting for my QS part so I can get everything done together,

simplythebest

Discussion Starter · #6 · Dec 3, 2018

Guys... an update. Nothing to do with oil etc.

The Wheel speed sensor wire has somehow come loose and scrapped against the tire.
Pls see pic.

The Freakership tried saying it was a rat bite!

Had fun with them showing the abrasive marks on the wire saying rats graze at equivalent speed of 100mph.
pls see pic.

Please check you front wheel speed sensors and their wires.

Warranty replacement... thankfully

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playersnoopy

· #7 · Dec 3, 2018

There's actually a recall on that I believe; mine was fixed/replaced when it was in the shop for another issue (something about the rear wheel speed sensor clip)

simplythebest

Discussion Starter · #8 · Dec 4, 2018

playersnoopy said:
There's actually a recall on that I believe; mine was fixed/replaced when it was in the shop for another issue (something about the rear wheel speed sensor clip)

This was the front. Not the rear. I better check my rear now!

playersnoopy

· #9 · Dec 4, 2018

simplythebest said:
This was the front. Not the rear. I better check my rear now!

Mine never had a front speed sensor recall... but as of mid November it did have a rear speed sensor clip recall while it was in the shop and they took care of it at that time.

carlpretzel

· #10 · Dec 8, 2018

simplythebest said:
Guys... an update. Nothing to do with oil etc.

The Wheel speed sensor wire has somehow come loose and scrapped against the tire.
Pls see pic.

The Freakership tried saying it was a rat bite!

Had fun with them showing the abrasive marks on the wire saying rats graze at equivalent speed of 100mph.
pls see pic.

Please check you front wheel speed sensors and their wires.

Warranty replacement... thankfully

Thanks, I'll check mine for rubbing

playersnoopy

· #11 · Dec 9, 2018

The recall is CR162 SRV-TSB-18-015 Rear Speed Sensor Update

oleary

· #12 · Feb 1, 2019

oleary said:
That's odd, I was just talking to Dave today and he said don't bother changing springs (stock is 1.05) instead change to 10W and 140 mm oil height.

He said you could do a revalve but that would be "for more serious race application".

We changed the fork oil to Motul 10W and set the level to 140 mm as Dave suggested.

Front is now hard as a rock and with ZERO preload we only get 7 mm sag. I am about 185 lbs.

Back to the drawing board.

Reactions: 1

nickfunk

· #13 · Feb 6, 2019

simplythebest said:
I had a track day last weekend and after 3 20 min sessions in the 4 session, the bike just popped a crazy wheelie when i opened it up on the straight.
I thought I had DWC in the wrong mode and rode the lap but the bike felt really funny. Some times hard and sometimes soft. After 2 or 3 corners i looked down to see the error messages and slowed down and came into the pits.

Thought it could be a glitch. so let her cool down for an hour. After that I removed the battery connector to see if an ECU reset will fix it. (that why the pic says set date and time)

It didn't. So I went out for a slow lap and the bike was not rideable. Forget DWC DQS and DTC. Just crazy suspension. Even in fixed mode.

I've had quick shifter issues, and my dealership is receiving the part this week. so I said I would get it all checked out together.

Only change I've done is change the front fork oil from 5w to 10w as the front was really soft for me.

Anyone else had this issue?

Thanks.

You didn't happen to adjust the preload in the front ohlins e forks? If you change the front fork preload and not reset ecu the bike will not like it!
Is your issue resolved yet?

simplythebest

Discussion Starter · #14 · Feb 27, 2019

simplythebest said:
Guys... an update. Nothing to do with oil etc.

The Wheel speed sensor wire has somehow come loose and scrapped against the tire.
Pls see pic.

The Freakership tried saying it was a rat bite!

Had fun with them showing the abrasive marks on the wire saying rats graze at equivalent speed of 100mph.
pls see pic.

Please check you front wheel speed sensors and their wires.

Warranty replacement... thankfully

nickfunk said:
You didn't happen to adjust the preload in the front ohlins e forks? If you change the front fork preload and not reset ecu the bike will not like it!
Is your issue resolved yet?

Please see my above post. The issue was the front wheel speed sensor.

I didn't realise I had to reset the ECU for preload changes. Is this required for the rear as well?

And by reset the ECU, I'm guessing you mean remover the battery connections for a few mins?

carlpretzel

· #15 · Mar 9, 2019 (Edited)

Guys where in the manual does it clearly state that you have to reset the ECU when making pre-load changes i.e. basic static sag setup?? I have made at least three sag setup changes with no problems. I'll keep reviewing the MX manual. The owners manual is useless for suspension setup.

Reactions: 1

playersnoopy

· #16 · Mar 9, 2019

carlpretzel said:
Guys where in the manual does it clearly state that you have to reset the ECU when making pre-load changes i.e. basic static sag setup?? I have made at least three sag setup changes with no problems. I'll keep reviewing the MX manual. The owners manual is useless for suspension setup.

It doesn't and I wouldn't think you'd need to.

Reactions: 1

carlpretzel

· #17 · Mar 9, 2019

playersnoopy said:
It doesn't and I wouldn't think you'd need to.

I agree, but a forum member in this post says otherwise. I'd like this member to post up a manual reference. I have searched the owners and maintenance manual and found nothing that states to reset the Engine Control Unit (ECU) after making manual pre-load adjustments.

nickfunk

· #18 · Mar 10, 2019

I never heard of it either, but a guy on ebay that sells a bunch of tools for the v4 bike and engine said it after I bought the tool to remove the fork tube cap.
He said it needed a ecu communication tool to do reset after preload adjustment.

I never heard of that but it made me not adjust preload on front forks yet...
I have the v4-s , and have any of you adjusted the front fork preload and not had any issues??

I wonder why someone would make that up.....

playersnoopy

· #19 · Mar 10, 2019

nickfunk said:
I never heard of it either, but a guy on ebay that sells a bunch of tools for the v4 bike and engine said it after I bought the tool to remove the fork tube cap.
He said it needed a ecu communication tool to do reset after preload adjustment.

I never heard of that but it made me not adjust preload on front forks yet...
I have the v4-s , and have any of you adjusted the front fork preload and not had any issues??

I wonder why someone would make that up.....

I've adjust and taken preload all the way out on mine; no issues; followed Dave Moss video on the V4S eval and adjusting it is no different than any other bike except you just click the plug back in place afterwards.

Reactions: 1

carlpretzel

· #20 · Mar 10, 2019

nickfunk said:
I never heard of it either, but a guy on ebay that sells a bunch of tools for the v4 bike and engine said it after I bought the tool to remove the fork tube cap.
He said it needed a ecu communication tool to do reset after preload adjustment.

I never heard of that but it made me not adjust preload on front forks yet...
I have the v4-s , and have any of you adjusted the front fork preload and not had any issues??

I wonder why someone would make that up.....

This is why I brought it up. Like playersnoopy I have made multiple fork and shock pre-load adjustments with no issues at all.

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