![]() | Home > Technical (L322) > Heavy power steering. Servotronic valve? |
![]() ![]() |
|
|
stan Site Moderator Member Since: 13 Jul 2010 Location: a moderate moderated moderator moderating moderately in moderation Posts: 35515 ![]() ![]() |
could be that or the BCU
|
||
![]() |
|
ChrisJJ Member Since: 31 Aug 2018 Location: Redcar Posts: 39 ![]() ![]() ![]() |
Thanks Stan.
|
||
![]() |
|
Dolphinboy Member Since: 07 Dec 2009 Location: Bristol Posts: 3199 ![]() ![]() |
Search BCU on here. there is lots of info. It also sometime/often ties up with one of the doors not unlocking. Easy job to change for new. 1 hr tops. |
||
![]() |
|
Pawl Member Since: 07 Nov 2017 Location: West Midlands Posts: 698 ![]() ![]() ![]() |
That's unlikely to be the servotronic valve - it's effect is most at idle and reduces significantly at speed, but appears not to go to zero. Paul,
|
||
![]() |
|
ChrisJJ Member Since: 31 Aug 2018 Location: Redcar Posts: 39 ![]() ![]() ![]() |
Isn't servotronic active all the time and dictates how much assistance to give based on speed? i.e less at speed gives more stability.
|
||
![]() |
|
Pawl Member Since: 07 Nov 2017 Location: West Midlands Posts: 698 ![]() ![]() ![]() |
The Servotronic valve causes extra hydraulic assistance to be added over and above the steering rack base assistance.
|
||
![]() |
|
ChrisJJ Member Since: 31 Aug 2018 Location: Redcar Posts: 39 ![]() ![]() ![]() |
Cheers Pawl.
|
||
![]() |
|
Pawl Member Since: 07 Nov 2017 Location: West Midlands Posts: 698 ![]() ![]() ![]() |
Maybe it is the BCU then - providing the correct output at very slow speed, but incorrect output intermittently at slightly higher speeds.
|
||
![]() |
|
Teaspoonasaurous Member Since: 08 Jul 2018 Location: Cambridge Posts: 73 ![]() ![]() ![]() |
I’m having the same issue. I checked codes and it said fuse b30 in BCU was gone. I’m going to investigate further on Sunday.
|
||
![]() |
|
ChrisJJ Member Since: 31 Aug 2018 Location: Redcar Posts: 39 ![]() ![]() ![]() |
Gonna get out there now with the computer and see if there's any codes.
|
||
![]() |
|
ChrisJJ Member Since: 31 Aug 2018 Location: Redcar Posts: 39 ![]() ![]() ![]() |
Ran diagnostic.
|
||
![]() |
|
Pawl Member Since: 07 Nov 2017 Location: West Midlands Posts: 698 ![]() ![]() ![]() |
You mentioned disconnecting the Servotronic valve in an earlier post. I forgot to say there's nothing to lose by trying that & seeing how the symptoms change - its all useful extra diagnostic info.
|
||
![]() |
|
ChrisJJ Member Since: 31 Aug 2018 Location: Redcar Posts: 39 ![]() ![]() ![]() |
I'll disconnect the servotronic now and see what happens.
|
||
![]() |
|
Pawl Member Since: 07 Nov 2017 Location: West Midlands Posts: 698 ![]() ![]() ![]() |
The BCU output is a Pulsed Width Modulated voltage & current - ie voltage that's be shut off & re-started at a varying frequency dependant on the vehicle speed.
|
||
![]() |
|
![]() ![]() |
|
All times are GMT |
< Previous Topic | Next Topic > |
Posting Rules
|
Site Copyright © 2006-2025 Futuranet Ltd & Martin Lewis
