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Old 17th November 2023, 15:23   #1
IainB
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Default ABS light, speedo, etc...

Hello all!
My diesel tourer has just popped up the ABS light, and the speedo has packed in.
From all I've read here, front right sensor is duff. Fairy Nuff, new sensor fitted to the front right. UK drivers side.

Still got the lights, still no speedo.
The question is, does the Left Hand Drive use the same right front sensor, or should I have changed the left front?
Can't communicate with the ABS ECU (that's another issue) with Smartbox X431, I'll get to that...eventually...CAN bus failure.
Cheers,
Iain
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Old 17th November 2023, 15:53   #2
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Originally Posted by IainB View Post
Hello all!
My diesel tourer has just popped up the ABS light, and the speedo has packed in.
From all I've read here, front right sensor is duff. Fairy Nuff, new sensor fitted to the front right. UK drivers side.

Still got the lights, still no speedo.
The question is, does the Left Hand Drive use the same right front sensor, or should I have changed the left front?
Can't communicate with the ABS ECU (that's another issue) with Smartbox X431, I'll get to that...eventually...CAN bus failure.
Cheers,
Iain
Hi Iain.
Either the sensor is no good or not close enough some after market sensors need a little shaved off them, if after checking and that you still get the same then it is most likely the bearing it's self that would need changing.

Is your car a left hand drive ? because of the question above.
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Old 17th November 2023, 16:40   #3
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Aye, Arctic, it's a lefty, I'm in Bergen, Norway...
Thing is, I plugged the sensor in before I fitted it, light didn't go off, should it have? It was a tight fit (DMGR sensor), had to shave it a bit and tap it in (gently).

SD1too, I'll get on it as soon as I can, but given that all I know is 'CAN bus other ECU's' from Smartbox, where to start? I'll peruse the wiring diagrams...

Derek, linkee no workee? I'll have a peek at the (I didn't know it existed) multiplug below the battery...

The car just passed its PKK, that's MoT to you, before this, so I've got 2 years...would like a speedo, though! :-)
I'm assuming that I shouldn't need to 'wipe' the fault code, am I wrong? 'Cos I can't...
Cheers,
Iain
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Old 17th November 2023, 17:02   #4
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Apologies Iain,
I rashly copied a shortcut.

Try this: https://the75andztclub.co.uk/forum/s...d.php?t=133814


Derek.
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Old 17th November 2023, 18:53   #5
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Cheers, mate, that worked. I'll start studying...
Iain
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Old 17th November 2023, 20:51   #6
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... I plugged the sensor in before I fitted it, light didn't go off, should it have?
No.
The sensor needs to be fitted into the hub to provide a signal.
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SD1too, I'll get on it as soon as I can, but given that all I know is 'CAN bus other ECU's' from Smartbox, where to start?
You'd be better off seeking a T4 session. Third party equipment diagnostics can be misleading.

RAVE explains that the IPK transmits the road speed on the CAN and K-buses. Given that the IPK is not displaying this information on the speedometer, the CAN bus shouldn't enter into it.

Simon
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Old 17th November 2023, 22:08   #7
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Simon, only T4 I know of this side of the North Sea is on the east coast of Sweden. I'm on the west coast of Norway....2000km round trip, er, maybe not! :-) I'll ask around my old Land Rover mates, they may know someone. WouldTestbook work, or is that only on the K series, not the BMW engine, or not at all?
I'm more of a Series 1 Land Rover mechanic than a data engineer...
" Given that the IPK is not displaying this information on the speedometer, the CAN bus shouldn't enter into it."
I'll need to look into that, but it does sound like the sensor, new or not, is dodgy, dirty, wheel bearing, whatever.
This from the link from Derek:
Start-up Self Test
(1)Start-up test: at ignition switch on the ECU in the ABS Modulator performs a basic self test during which the yellow ABS illuminates. During the start-up test each sensor is tested electrically and the ABS modulator is tested both electrically and hydraulically. If the ABS light remains on it most likely points to an electrical fault or less likely an ABS modulator or hydraulic fault.
So, if the sensor was OK, the light should have gone out, even though it wasn't fitted, just plugged in, no?
I've got red ABS, yellow brake, and yellow traction control lights. And no bl@@dy speedo!
All input much appreciated,
Iain
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Old 18th November 2023, 00:30   #8
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Hi Iain.
Have you driven the car since replacing the ABS sensor ? if not try driving it to see if the light goes out and the speedo come back.
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Old 18th November 2023, 08:57   #9
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I've got red ABS, yellow brake, and yellow traction control lights. And no bl@@dy speedo!
Ahh, thanks for the extra information Iain which helps.

With three warning lights it sounds to me as if you have a more widespread ABS problem rather than it being limited to the front right-hand sensor. I had the same indication earlier this year and it was excessive brake dust in the rear drums producing interference on the sensor signal(s). T4 reported the interference but the location wasn't specified so a bit of detective work was necessary!

In contrast, when my front ABS sensor leads were damaged by contact with the wheel (have you checked this?) I recall that only the ABS warning light was illuminated.

Arctic's advice is confirmed by RAVE which says that following repair of a sensor fault, the warning lamp will remain illuminated until vehicle speed exceeds 7.5 mph (12 kph) so a road test is essential.

Simon
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Old 18th November 2023, 22:51   #10
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Simon, only T4 I know of this side of the North Sea is on the east coast of Sweden. I'm on the west coast of Norway....2000km round trip, er, maybe not! :-)
Iain
I wonder who that could be

Agree with Simon, don't jump to conclusions esp that the ABS module is defective. I recently worked on a very soggy V6 that had a Christmas appearance on the IPK, everything possible was lit up. The Bosch centre in Stockholm condemned the ABS module and wanted to send it to Holland for repair. The SRS fault was real enough, the side sensors had got soaked, but the ABS & traction control warnings disappeared when I repaired the broken and corroded earthing points.

You've got Sebastian in Bergen who is quite handy with Toaf, see what leads Toaf can give you. I know that Toaf isn't fully compliant with the 1.8s but very good with V6s and diesels. Testbook is just an earlier version of the T4, so if you can find someone with it and it can handle the CDs, give it a try, but give Sebastian a shout first.

Good luck

Last edited by vitesse; 18th November 2023 at 22:52.. Reason: Hate auto correct
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