Hi Guys,
so the x250 from hell passed it's test on Friday. But..... It's too dangerous to drive!!

The brakes are as hard as hell and judder when you try to stop and it takes a massive amount of pressure to get it to stop. But drive it for a few minutes then the ABS and Handbrake lights come on and the brakes work perfectly!

SO.. I plugged into multiecuscan 4.3 and talked to the Bosch abs 8 straight away. It gave me a code of C1250 Interference on Drive wheels speed signals. Invalid signal.

Fair enough I thought must be a bad sensor but it doesn't say which one.

Decided to try for some live data under parameters. Selected the 4 wheel speed sensors, into graphs, started monitoring and went for a careful drive. Nothing. No data recorded.

I went into Actuators and tried each unit but (unlike when I've done the same with BMW) none of them did anything, not a buzz or a click. If I unplug the ABS module the multiecuscan reports that it's not there so it is definitely being recognised when connected.

Is my ABS unit shot or is my free version of the SW just not able to do what I need or both!

I really really hate this van!!

T

Can't help with the MES problem, except to say that the list on MES website says that Bosch ABS 8 should be a fully accessible ECU on the free version.


A bit of googling suggests that C1250 is related to the rear left ABS inlet valve circuit though.

RS3100 said:

Can't help with the MES problem, except to say that the list on MES website says that Bosch ABS 8 should be a fully accessible ECU on the free version.

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Yep, saw that alright and it's what leads me to believe that the ABS pump/controller may be faulty as it's not reacting to any commands

RS3100 said:

A bit of googling suggests that C1250 is related to the rear left ABS inlet valve circuit though.

Click to expand...

Again saw that too but the message of "Interference on Drive wheels speed signals. Invalid signal." along with the speedometer being a bit erratic, bouncing up and down a bit, which I forgot to mention. sort of dismissed that in my mind.

With x250 tis more likely to be water ingress, loom damage than anything complicated. Check the abs connector, the loom behind headlight for chaffing and fusebox for signs of water ingress. The abs units for x250 are available for about £15 on ebay.

I decided to backtrack over what I've done in the past with the brakes. Remember I had issues before with the drivers side front and ABS? I had changed the wheel bearing and the abs sensor.
So I pulled out the 'new' bosch sensor, it was covered in grease. Put the old one back in and now I've got a proper fault for the drivers front ABS sensor.

Round and round and round!

T

checked the first few inches of loom wiring from the sensor and there are no breaks. Swapped the bosch sensor back in and the problem is still there. I'm going to swap both front sensors over tomorrow and if the problem is still on the RHS then the only thing left is the bearing with the abs trigger built in that I replaced last year. So it'll be a new bearing again!

Did I mention that I hate this van?

Wiring checked from sensor to ABS controller. All ok, sensor swaps this afternoon.

Sensors swapped over, fault still on drivers front so by a process of elimination I must have damaged the abs pulse generator in the wheel bearing when I was fitting it. Oh well that's another morning and 50 euro that'll be wasted.

Torq said:

Sensors swapped over, fault still on drivers front so by a process of elimination I must have damaged the abs pulse generator in the wheel bearing when I was fitting it. Oh well that's another morning and 50 euro that'll be wasted.

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Hopefully you're getting somewhere.

FWIW I tried MES on my X290 - Bosch 9 ABS ESP this afternoon. I could hear a single click from somewhere under the dash (or maybe the ABS unit) each time I tried actuating one of the solenoid valves, but the status indication in MES never changed from "Off" and I couldn't get it to graph anything.

I then tried actuating various lights and functions through the BCM, which I know has worked before. Everything I tried, including various internal and external lamps, windows etc. all worked via actuation tests, but again I couldn't get a single thing to plot on the graph function.

This is with MES multiplexed licenced BTW.

I've just acquired a Launch CRP MOT at a very good price, which does graph plotting quite nicely. Unfortunately though it doesn't perform actuations and I couldn't stretch to an X431 device with those functions.

Just waiting for the new wheel bearing to arrive but in the mean time I'm quite happy to drive without ABS. My 240 didn't have it and I managed to drive that for almost 10 years without incident.

The MES issues will go on the long finger and I might just build another laptop someday to see if it makes any difference.