Fault codes and other joyous things

Rockingit · Dec 28, 2023

So whilst I wait for some new bushes (see other thread), plugged in a borrowed diagnostics unit to see what's up with the ABS.

I was expecting to get a sensor error but instead got the message 'Steering Angle Plausibility' (temporary system deactivation). I then looked at the steering module and got 'Wrong Can-version (previous)' and 'CAN-Bus off (previous).

Meanwhile, buried in an Instrument system sub-menu I found 'EBV Function fault received from ABS ECU' along with 'Instrument Pack checksum incorrect'.

Can anyone translate for me, please?!

Am I looking at four genuine faults or is this just a canbus issue causing all of them? It really wouldn't surprise me if the previous owner had been tinkering with areas of the software that didn't need to be! If so, is there a 'factory reset' in the system anywhere?

On the upside, no engine or transmission codes

marjon · Dec 28, 2023

Rockingit said:
with 'Instrument Pack checksum incorrect'.

I have no idea TBH but what I do know is "checksum" is something that if you mess with software or change something it will show errors.
Its some sort of internal check within the software to make sure its all happy to play together. Best I can explain from what I know, in other words I stay away from stuff like that

.

You seem to be questioning the PO? can you verify the mileage from MOT history or paper files? Although I thought there was a "tamper" dot that showed up on the dash if it was incorrect/not matching.

Remind us of the car year/model.

J

Rockingit · Dec 28, 2023

marjon said:
I have no idea TBH but what I do know is "checksum" is something that if you mess with software or change something it will show errors.
Its some sort of internal check within the software to make sure its all happy to play together. Best I can explain from what I know, in other words I stay away from stuff like that .

You seem to be questioning the PO? can you verify the mileage from MOT history or paper files? Although I thought there was a "tamper" dot that showed up on the dash if it was incorrect/not matching.

Remind us of the car year/model.

J

PO was sound and all the paperwork checks out, just a tinkerer style car nut who'd had the USB adapter cable and random bits of downloaded software but didn't seem to be able to even work his laptop..... (he tried to show me when I bought it).

2004 L322 4.4 petrol

Datatek · Dec 28, 2023

Rockingit said:
So whilst I wait for some new bushes (see other thread), plugged in a borrowed diagnostics unit to see what's up with the ABS.

I was expecting to get a sensor error but instead got the message 'Steering Angle Plausibility' (temporary system deactivation). I then looked at the steering module and got 'Wrong Can-version (previous)' and 'CAN-Bus off (previous).

Meanwhile, buried in an Instrument system sub-menu I found 'EBV Function fault received from ABS ECU' along with 'Instrument Pack checksum incorrect'.

Can anyone translate for me, please?!

Am I looking at four genuine faults or is this just a canbus issue causing all of them? It really wouldn't surprise me if the previous owner had been tinkering with areas of the software that didn't need to be! If so, is there a 'factory reset' in the system anywhere?

On the upside, no engine or transmission codes

Checksum is basically the value obtained by the addition of the binary values of fixed data or in some cases the actual program code. So it could for instance be that the VIN code recorded in the instrument cluster does not match the code in the BCM. I do not know enough about the L322 to be specific.

marjon · Dec 28, 2023

Datatek said:
Checksum is basically the value obtained by the addition of the binary values of fixed data or in some cases the actual program code.

Thats what I said

. But it has to match/be recognized to be accepted?

Datatek said:
So it could for instance be that the VIN code recorded in the instrument cluster does not match the code in the BCM. I do not know enough about the L322 to be specific

None of them like an instrument cluster being changed even the P38.

J

backinblack · Dec 28, 2023

As said look for a tamper dot (I think it's this one) if it's had a used cluster or LCM the mileage and VIN may not have been corrected.

pwood999 · Dec 28, 2023

What diagnostics kit was it ? Always be wary of faults reported by generic far east readers.

Datatek · Dec 28, 2023

marjon said:
Thats what I said . But it has to match/be recognized to be accepted?

None of them like an instrument cluster being changed even the P38.

J

Yes, the calculated checksum has to match the recorded checksum.

Rockingit · Dec 28, 2023

pwood999 said:
What diagnostics kit was it ? Always be wary of faults reported by generic far east readers.

Autologic with LR specific software. Has a reasonable help and diagnostics guide (even has pictures of parts) but it still needs a grown-up to tell you what half the stuff actually means.

I think the instrument cluster is all legit, when you interrogate it the data that comes up all looks back to week 27, 2004 which is obviously matching the age of the vehicle, and various other data fields all have the correct VIN on record.

Wazzajnr · Dec 28, 2023

Ebv function fault sounds like electric battery vehicle.
I would clear all and try again.
Could be spurious faults, could be legit.
Steering angle could cause abs faults so that one probably needs sorting if you have abs issues.

Graculus · Dec 28, 2023

Unless you have the 'tamper dot' I wouldn't worry about the checksum, it'll take a full reload and transfer of the odometer value to maybe sort it.... The EBV is a 'ghost' code - a hangover from fully BMW systems, it's set as there's no endpoint for it to resolve to. Dealer systems are 'blind' to the specific DTC so it won't show, Autologic doesn't have a VIN-specific mask so shows all, whether relevant or not.
As already mentioned, the steering angle sensor will be the root cause of the ABS fault, possibly caused by something as simple as a battery disconnect. read the live values to check the straight-ahead position is as near as damn-it 0.0 deg. and that the full lock either way shows roughly the same angular value, look out for any 'spikes' in the values as you're turning the steering wheel, this can be an indication of poor mechanical contact or the SAS on it's way out.

aj1954 · Dec 29, 2023

backinblack said:
As said look for a tamper dot (I think it's this one) if it's had a used cluster or LCM the mileage and VIN may not have been corrected.

View attachment 305999

Ten seat belts?

Rockingit · Dec 29, 2023

Speaking of instrument clusters, on mine the LCD backlight has/is going on one side, is this a repairable backlight thing (because old ones used to actually be lamps!) or will it need a new LCD display? And if so, can you even get them?

marjon · Dec 29, 2023

aj1954 said:
Ten seat belts?

No the message actual says FFS ten seat belts

aj1954 · Dec 29, 2023

marjon said:
No the message actual says FFS ten seat belts

That was my point.

Fault codes and other joyous things

Rockingit

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Datatek

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