Peugeot 406 diagnosis problem

Talk about the 406's electrical system, what wires do what, how to add extra functionality, etc.

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minevgear
Newbie
Posts: 4
Joined: Sat Feb 15, 2025 2:11 pm

Peugeot 406 diagnosis problem

Post by minevgear »

Hello dear friends!
I seem to have a problem diagnosing my peugeot 406 sedan (facelift, RFR petrol engine, year 2000, siemens BSI).
Originally i wanted to retrofit the cruise control system, change out the clarion/harman audio setup for the JBL one (cd on my radio is fried anyway) and to help with diagnosing problems like my now "jumping" speedo needle (which i still dont know why it does that?).
So to the point... got myself a lexia 3 clone, "rev 3 FULL CHIP 921815C", installed and dealt with win XP on my old laptop (Lenovo thinkpad T60), downloaded the driver for said clone (USB Com Board (Multi-instance)). Also i installed PP2k from the peugeot forums (rn running the updated ver. V24.19). After installation i tried to check my cable ver with the PSA interface checker and it didnt come up with anything for my cable???? Anyway when i got into PP2k it let me scan my car and see some data, however the most important thing i wanted to see didn't work - the engine ECU.
The error it showed was "ECU has not replied".
I'd love to get some advice - anything is welcome!
Have a wonderful day/night! :cheesy:
frog
2.0 Turbo
Posts: 399
Joined: Sun Aug 24, 2014 12:18 pm
Location: Netherlands

Re: Peugeot 406 diagnosis problem

Post by frog »

Hi, if the PP2k software is able to connect to other equipment (like BSI, ABS etc.) then it seems the software is working fine. Just the connection to the engine ECU is failing.

It could be a wiring issue in the vehicle, but chances are high that your Lexia clone is not working correctly. Maybe some-one near you has a working (tested) Lexia cable?

I have had a Lexia cable that had a similar issue; it would connect to some of the equipment but not all. After replacing the Lexia cable it all worked.
Current "fleet":
2003 406 Estate 2.0HDi 110 - 7 seater - just hit 710.000 kms :cheesy:
2001 Citroen Saxo 1.6i 8v 100

Previously owned:
2000 406 Sedan 2.0 HDi 90
2000 406 Coupé 2.0i 16v 138 - Riviera Blue

PP2000 user, can help with faults / diagnostics in the Netherlands.
minevgear
Newbie
Posts: 4
Joined: Sat Feb 15, 2025 2:11 pm

Re: Peugeot 406 diagnosis problem

Post by minevgear »

Hello!
Thanks for the info! Sadly i cant find anyone with a working lexia cable. Maybe i should contact the supplier i bought it from or check connections somehow? Also if i test it on another car and it works that would probably mean that my car is the problem right?
frog
2.0 Turbo
Posts: 399
Joined: Sun Aug 24, 2014 12:18 pm
Location: Netherlands

Re: Peugeot 406 diagnosis problem

Post by frog »

minevgear wrote: Wed Jun 25, 2025 6:02 pm Also if i test it on another car and it works that would probably mean that my car is the problem right?
Yes, that is another way to test it. Chances are pretty low that two vehicles have the same wiring problem.
Current "fleet":
2003 406 Estate 2.0HDi 110 - 7 seater - just hit 710.000 kms :cheesy:
2001 Citroen Saxo 1.6i 8v 100

Previously owned:
2000 406 Sedan 2.0 HDi 90
2000 406 Coupé 2.0i 16v 138 - Riviera Blue

PP2000 user, can help with faults / diagnostics in the Netherlands.
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