C5 ECU: 50 "After Sales Zone" allocations - then?

[addo]

In Lexiating an '02 C5 today, I had course to delete a fault that required me to put in the mileage and log the deletion accordingly.

That took the number of logged entries to thirteen, and had me wondering what happens when you reach the maximum of fifty - do the oldest ones tip off the back end? Or is the ECU/CPH/dash now dustbin material, requiring either sneaky tricks or new parts?

Regards, Adam.

[Paul-R]

Thanks for asking the question - I had wondered as well.

Incidentally - mileage? Even though it says that on the screen I think you have to convert to kilometres - which is not a problem for you now I think.

[wheeler]

It just starts to knock out the oldest entrys stored in the memory.
You dont have to actually input the milage you can just leave it at 0 & validate it.
All BSI's read in KM no matter what the odometer reads so it always asks for the KM but i would say it is widley accepted that if the car is in a counrty that uses miles then the entrys previously logged will actually be miles.

[addo]

Thanks, Wheeler. I held off without knowing any better this morning - a mate diced the ECU on a 206 some years back and its repair cost was not pleasant for him....

Now my only challenge with the Lexia is using its functions to store/retrieve/transfer data.

Cheers, Adam.

[Sl4yer]

Hmmm... I Lexia'd a C5 for a member on here, and the engine faults could not be reset because the 50 limit had been reached.

James

[wheeler]

Hmmm... I Lexia'd a C5 for a member on here, and the engine faults could not be reset because the 50 limit had been reached.

James

Interesing... what ECU/injection system was it ?
Never had a problem erasing the faults, just comes up with a message sayin 50 had been reached.

[Toby_HDi]

I do hope the older entries are overwritten.

My Coupé ECU has this 50 service zones thing and 30 odd are used.

If it makes a difference Coupé is Bosch Motronic ME7.4.6

[Sl4yer]

Interesing... what ECU/injection system was it ?

I'm not 100% sure, but I think it was a 2003 V6 model.

James

[aszaultz]

I have already pass after zone service 50. Now i can reset or clear fault but can't memory event after 50 zone sales.

[Rhothgar]

I'm searching for clues on this.

I think I am at 50 now because I cannot erase faults on the Xantia!

I've read on an ECU forum that the immobiliser chip stores the DTC and once you reach the limit, you need to reset it. Problem is I cannot find how to reset it!

There's nothing quite like an old post bump. More research required...

[aerodynamica]

I'm passively interested in what you might find here. I avoided clearing faults for the injection previously because I was put off by this 50 limit. Thought I'd leave 30 'for a rainy day'

[Rhothgar]

Well so far as I have read and I am trying to get verification on this.

Fault clearing is definitely not possible after 50 after-sales zones. My digging so far has not come up with a definitive answer but the EEPROM needs fault codes erasing manually after this it would seem.

I will be using WarHorse as a guinea pig and will keep everyone updated.

I am trying to track down the HEX addresses for where DTC's are stored. Some posts suggest EEPROM some suggest flash chip!!!

My diagnostic mate last night in a conversation mentioned that he's seen some cars where DTC's get written to one location for Pure OBD and another chip for manufacturer's codes.

It's much more complex that I ever thought.

[aerodynamica]

Jeeez, want expecting that level of complex

[xantia_v6]

I have read in a couple of places that after the store is full, faults can still be recorded and cleared, but are no longer written to the store. I haven't needed to verify it myself.

[Rhothgar]

I have read in a couple of places that after the store is full, faults can still be recorded and cleared, but are no longer written to the store. I haven't needed to verify it myself.

Well I received a nice quality OBD2 scanner today which uses BLE instead of WiFi and was finally able to read the codes that I can see with the Lexia.

They reappear at ignition on after being cleared whereas I cannot clear them at all in the Lexia. If they were permanent faults then fine but they are temporary.

I suspect that the manufacturer codes are written to the EEPROM.

I've had a look through a bin file using HxD (which is a Hex Editor programme) and cannot see any commonality between two bin files I believe are from the same chip - read 6 years ago though.

I have about 4 or 5 ECU's (3 of which are RHZ - Bosch 0 281 010 251) so I should be able to identify any code that differs and that which is the same.

I've been reading up about Mode 7 this evening and this was generated by the odd fault descriptions that the OBD gave, for example:-

Lexia P1135 - 3rd Piston Deactivation Solenoid - Short to earth (plus a separate code for short to positive)

OBD P1135 - Pedal Position Sensor A Circuit Intermittent
Status: Test conditions are met, Test is inhibited by other DTC.

Here is a list of OBD codes which might prove useful to forum folk in the future but I couldn't find a copy of the original committee's adopted proposals for the standardisation:-

https://www.autoequipment.com.au/image/ ... 0CODES.pdf

In another one I found on the internet, it states, "P1135 - Heated Oxygen Sensor (HO2S) Lean Mean Bank 1 Sensor 1" so what do you believe?

I am aware our beloved French compatriots were late to the game and were resistant to adopt and they clearly also chose their specific codes and programmed their diagnostic equipment to deliberately cause confusion.