all the electrics have gone nuts.. windows, indicators and display have gone now

the abs doesn't seem to work, it skids if I slam on the brakes.. (power steering is intermittent)

there's one thing in the circuit diagram I can't identify, the symbol looks a bit like a spark plug but has 3 lines under as if it sprays or something..

I think the brake fluid level sensor comes off the psf1 and I don't have the ESP box fitted..


what would it be attached to? I've got
wheel sensors, ECU, relay, psf1, earth's..
(ignition, instrument panel, alarm)

perhaps the immobiliser? idk

I'll keep searching for the same year.
I'm not sure which yr that donor car is..

when I get the car home I'll try unplugging it

2008?
mines 2007..

whereabouts is the mk number?
on the plastic?

WOW!!

I found a really helpful site thought I should share it here

this is the section on my ABS module

https://www.actronics.co.uk/acinsights/ate-mk70

the knowledge section is really interesting

Called.. u can't speak to a technician unless u buy something

but the website has BUCKETS of useful information

not sure where to post it for general knowledge

Ozvtr wrote: ↑Fri Mar 10, 2023 11:53 am Very complicated signals run through the ABS module to and from the engine ECU!! If you "lost" the ABS ECU the engine will not start!!

Ibog wrote: ↑Wed Mar 15, 2023 1:11 am there's one thing in the circuit diagram I can't identify, the symbol looks a bit like a spark plug but has 3 lines under as if it sprays or something..

I went back through your posts and you haven't even said if or when the ABS light comes on.

Can you be a bit more succinct in you description of faults? "Gone" doesn't help.

Yes, "loss" of the ABS module might cause "Loss" of speed information and skidding but your engine is still running and you have mentioned nothing about the ABS light.

A "classic" problem with the ABS module is corrosion on the electrical connector contacts. Remove the cable tie and peel back the plastic boot. Pull the electrical connector apart and look for corrosion. Salty water off the road can get into the connector.

thanks I will do.

I got beeps and light first whilst driving..
stop: braking system faulty
airbags/seatbelts
antipollution
and power steering
occasionally says abs system faulty also

took to local VAG garage: fault brake fluid sensor
bloke said it's the main ECU though

so I investigated and as car starts and drives couldn't be

mate from RAC or similar plugged in and
said it can't read the ECU

spent out got diagnosed at another posh garage..

they say everything points to the ABS module messing with the CAN also and want £600 quid to recondition and fit

I'll get the car home soon
I'm just trying to find as much info as I can on the actual data it uses and how I can match a used chip..



oh and after a bit of reading I wonder if the item I couldn't identify on the abs system schematic could be the ESP stability sensor in the steering wheel?
could that be right?
it is dotted

but it may be something else

still reading those lovely articles
seems possible chip issue sadly..
but I'll check obvious connections etc when I get it here

thanks for the help
I'm well outa my depth but I'm learning

I would love to know what gets programmed into it

um...

I got the mk70 number by giving the abs repair company the other number because the car wasn't here..

would there be mk60's and MK70's with the same number then?

I think it may have said they're distinguishable by the shape of the plastic part, don't quote me..

hopefully taking part off today, I'll have a proper look at it.

thanks everyone

Ibog wrote: ↑Wed Mar 15, 2023 12:14 pm stop: braking system faulty
airbags/seatbelts
antipollution
and power steering
occasionally says abs system faulty also

"braking system faulty", "power steering" and "abs system faulty" are probably related.
"airbags/seatbelts" would not be related to ABS. Common problem here is the wiring under the driver's or passenger's seat (broken wires from things being kicked under the seat). Or passengers airbag ON/OFF switch circuit.
"antipollution" is the catalytic converter or one of the O2 sensors. Sensor element or heating circuit of the O2 sensor.

Ibog wrote: ↑Wed Mar 15, 2023 12:14 pm spent out got diagnosed at another posh garage..

they say everything points to the ABS module messing with the CAN also and want £600 quid to recondition and fit

Ibog wrote: ↑Wed Mar 15, 2023 12:14 pm oh and after a bit of reading I wonder if the item I couldn't identify on the abs system schematic could be the ESP stability sensor in the steering wheel?
could that be right?
it is dotted

but it may be something else

Hint, hint.....It's the engine ECU!! You don't seem to be listening. As I will say for the last time the CAN BUS goes THROUGH the ABS ECU to the engine ECU. If the ABS ECU was "messing " with the CAN BUS the engine would not start! As I said, a very complicated dialogue goes back and forth between the BSI and the engine ECU...literally through the ABS ECU... to start the engine!!!
I'm not saying there isn't something (else) wrong with the ABS ECU but it can't be "messing up" the CAN BUS.

Ibog wrote: ↑Wed Mar 15, 2023 12:14 pm seems possible chip issue sadly..

Well you've got lots to choose from! In my person opinion, the "chips" tend to be reliable. Bad solder joints, corroded electrical connectors (corrosion in general) and just plain worn out stuff tends to constitute the majority of failures. Again, not saying semiconductor failures don't happen, they just tend to constitute the minority of failure modes.

Ibog wrote: ↑Wed Mar 15, 2023 12:14 pm I would love to know what gets programmed into it

Into what? Most (not all) of the ECU's are micro computers, all doing their own thing and occasionally talking to each other. The Code would be long and boring. Only the engineers who designed them and hackers would be interested.
I have hacked into my C3's BSI to get the engine ECU PIN to add more keys. Obtained (and changed) odometer readings from disembodied instrument clusters. It was interesting, but I probably wouldn't do it if I didn't need to!

Ibog wrote: ↑Wed Mar 15, 2023 1:11 am

there's one thing in the circuit diagram I can't identify, the symbol looks a bit like a spark plug but has 3 lines under as if it sprays or something..

The dotted line means it is not fitted to all models. An optional extra.

yes I thought that too but it's a picture of the injector!! it's the ECU..

who knew lol.. it's obvious now I think of it.. I expected it to have a chip on it like other ECU modules etc..

I think I've found all the diagrams I need now anyways..

thanks everyone.. really appreciate the help.. bless you all