This post starts with Peugeot 406 symptoms and what I tried to do, I doubt Turbo short circuit to positive, then finally get the problem fixed with the help of Lexia 3 PP2000 diagnostic tool and others guide.
PP2000 diagnostic tool, I bought from obd2tool.com,
it is built in original full chip 921815C/ firmware, and the best PP2000 to work with Peugeot 307 compared with the older version in the workable car model and year.
This is what I get
Symptom and what I tried to fix:
The swirl-flap move back really slowly when powered by the turbo EV vacuum. When I had a look at the vac pipes from the pump to the turbo EV and there was a kink in the pipe.
I swapped the pipe with my 4mm spare pipe and when for a jubilant drive up the road
I temporarily plumbed the swirl EV to the turbo to see if I could see/hear the turbo diaphragm opening/closing when revved past the magic number, but I couldn’t, which fills me with dread because I think it should have moved at 2100RPM
However, the 4mm vac pipe that feeds the turbo EV was getting ‘swollen’ when I rev the engine, which I never noticed on the thinner pipe.
Confused, maybe the turbo diaphragm, maybe the wiring, maybe I should think about removing the turbo from the donor car which I will positively* enjoy*
May 10, 2015 Update:
Earlier today I checked the wires to the turbo EV and there are no signs of splits or crimping, so I squirted some cleaner in the connector anyway. I then redid the vacuum pipes with the old leftover pipes to eliminate these too.
Took the car for a spin after clearing the fault, and it came back as soon as I put my foot down…
I looked on lexia3 PP2000 and yes, the turbo OCR goes from 53% at rest to around 40% when revved ( I was cheekily driving while looking at the laptop, but the results were too risky to look at… ) so I guess there is power going to the EV.
The car will be jacked up one day so I can inspect the intercooler pipes from underneath.
Is there anything I may have overlooked that will affect the turbo overboost? There is a video on pootube about a guy with a 607 2.2Hdi with the same problem, but no audio and I think it may be pointing out the 3rd piston deactivation as being an issue?
Google / other Peugeot Forums suggest a VAF, which is a way of determining the position of the vanes in relation to the MAF, which seems to be part of the MAF circuit on later Peugeots….
‘ VANE AIRFLOW SENSOR (VAF). The VAF has a mechanical flap-style sensor that is used on Bosch and other import multiport fuel injected engines. The function is the same as a mass airflow sensor, but air pushing against a spring-loaded flap moves a rheostat to generate an electronic signal. ‘
Anyone able to lend me a MAF to try out…. I have a 110 MAF here but I think they are different from the 2.2 Hdi.
May 11, 2015 Update: Fixed
I have been racking my brains as to what I have overlooked in my elimination of possible reasons for the fault, and I was just contemplating on how to go about swapping the engine bay fuse box to eliminate that when I sort of had an idea.
I checked the vacuum system at the servo end, thinking that this would prove the pipework was okay, but when I checked the turbo EV for vacuum before the turbo, the reading was very low – but I didn’t think to check the level of vacuum before the turbo EV. This proved to be equally crap, so the problem was no vacuum to the turbo EV. I swapped the turbo EV vacuum feed from the 3-way restrictor on the vac pump to the blank I have by the servo and voila..!!
All it was, was a partially blocked restrictor….
The car is now back to its usual self, and is of course upsetting the local Aldi’s and Beemers ( beat a posh looking Alfa earlier… )