New air throttle defective?

[Cristache39]

Hi everyone,

The pacient is a DS5 2012, 2.0 163hp.
3months ago the check engine and service appeared after a ride of almost 100km. Later the car entered in limp mode too. After investigation we found that the air mixer is faulty so i’ve decided to replaced it with a new one (Valeo - the service told me that the electrical part of the valve is defective and i saw also the gasket gnawed). After replacement the errors were deleted but without an adaptation due to the fact that the service had only Delphi scan tool.

Since then i have the intermittent errors : P1498 - Incorrect position (to closed) and P2125 - Deviation in the initialization of one of the 2 race ends. They were continuously deleted, somebody tried with Launch to make that adaptation (say to the car that the valve was replaced), again deleted and so on.
No errors since the valve was replaced and the car seems to go nice.

Is it possible that the new air mixer was defected? Or what i should check further?

Btw, i have the full details of the errors from Diagbox, i can add them if it helps.

[Cristache39]

I will try to make another reinitialization with Diagbox, hope it will fix the issue.

[GiveMeABreak]

The battery is supposed to be disconnected when replacing, so in case it was not, suggest you do a BSI reset after clearing the fault code again:

BSI Reset / Battery Disconnect / Reconnect Procedure

Fault Code:	P1498
Description of Fault:	Air mixer: Position incorrect (Closed too far) (Service). The position measured is less than the reference by more than 40 % for 5 seconds. Conditions of activation of the diagnostics: Engine has been running for at least 6s.
Conditions for Fault to clear:	Driving with the engine hot for 5 min while remaining below an engine speed of 2500 rpm under half-load
Downgrade Modes whilst Fault is active:	-
Symptoms:	Noise Smoke from the exhaust Slightly higher fuel consumption Engine hesitating, cutting out Lack of power Absence of automatic stopping of the internal combustion engine Problem activating the power unit Forced driving in electric transmission only Problem with automatic activation of the electric motor Loss of the ZEV (Zero Emission Vehicle) electric mode
Suspect Areas:	Air mixer Air doseur electrovalve Air mixer position copy Vacuum circuit Electrical harnesses

[Cristache39]

The battery is supposed to be disconnected when replacing, so in case it was not, suggest you do a BSI reset after clearing the fault code again:

BSI Reset / Battery Disconnect / Reconnect Procedure

Hi Marc,

OK, so clearing first the fault codes through Diagbox and then follow the above procedure, roger!

I will come back with an update, thank you!

[GiveMeABreak]

I'm not saying it will fix it, but you really want to reinitialise the BSI and all the ECUs to rule this out.

[Cristache39]

I'm not saying it will fix it, but you really want to reinitialise the BSI and all the ECUs to rule this out.

But something bad can happen after this process or it’s a safe one?

It worth a try before starting to change something else.

[GiveMeABreak]

No problems, this is what you are supposed to do before and after when the battery is disconnected. It ensures that the ECUs are properly shut down and go to sleep correctly before waking up. It prevents electrical problems associated with disconnecting the battery.

[Cristache39]

No problems, this is what you are supposed to do before and after when the battery is disconnected. It ensures that the ECUs are properly shut down and go to sleep correctly before waking up. It prevents electrical problems associated with disconnecting the battery.

Ok, i didn’t knew that, noted.
Thanks a lot Marc and how i said i will come back.

Have a nice evening!

[Cristache39]

Hello,

Maybe a stupid question but it is mandatory to disconnect only the negative lead of the battery or it will work with the positive one also?
I saw that is a little difficult to get there, i think that the wires on top of the battery needs to be removed in order to have acces on negative side being situated in the back.

Accessing the positive lead is much much easier.