C5 2.0 HDi power loss.

citroenxm · Post by **citroenxm** » 01 Mar 2011, 10:06

I WARNED you that the Light would come on..!!

Paul

centurus2400 · Post by **centurus2400** » 01 Mar 2011, 10:23

And you were quite right...

Oddly enough it didn't come on straight away,I'd gone about three miles up the road and was just going to pull into a lay by to reconnect the MAF. I thought I'd got away with it!

I assume that it has now logged a permanent fault - disconnecting the battery for 20 minutes won't make it go away and it will need a Lexia session.

Post by **Paul-R** » 01 Mar 2011, 12:05

centurus2400 wrote:I assume that it has now logged a permanent fault - disconnecting the battery for 20 minutes won't make it go away and it will need a Lexia session.

No - after a certain number of engine restarts (5?) the light will go off. It will remain in the log as a fault though but only as a record of an event that happened.

Chris570 · Post by **Chris570** » 01 Mar 2011, 12:19

fynnbar wrote:Chris, do you mean a split vac pipe or split intercooler/inlet pipe. You do not get a MIL or limp mode for low boost post-turbo. The MAP sensor is purely to detect normal or overboost scenarios.
Woody is right - disconnecting the MAF is a good way to see if it's faulty. The ECU will run the car on a generic map, which is better than running it with a faulty MAF reading, hence you'll see an improvement.

i mean split intercooler/pipe, it has a boost pressure sensor in the inlet manifold so it can tell what boost the engine is actually seeing and so can detect that if the turbo is spooled up and there isnt enough pressure at the inlet there must be a split or blown turbo ergo EML

citroenxm · Post by **citroenxm** » 01 Mar 2011, 19:10

The Boost pressure sensor on 110bhp models is NOT in the inlet manifold, its a small sensor mounted on the TOP of the intercooler at the battery end...

Paul

Chris570 · Post by **Chris570** » 01 Mar 2011, 19:41

interesting, service citroen showed it there and the split in my boost pipe was from the intercooler to the inlet

centurus2400 · Post by **centurus2400** » 01 Mar 2011, 20:15

Paul-R wrote:
centurus2400 wrote:I assume that it has now logged a permanent fault - disconnecting the battery for 20 minutes won't make it go away and it will need a Lexia session.
No - after a certain number of engine restarts (5?) the light will go off. It will remain in the log as a fault though but only as a record of an event that happened.

Yep, after 5 engine restarts it did go out all by itself

I've ordered the replacement vacuum electrovalve and will report back when I've fitted it.

And yes, the boost sensor is mounted right at the front of the engine compartment on my 110, and not on the inlet manifold.

wright · Post by **wright** » 01 Mar 2011, 20:17

if there is a split in the pipe you should here it when you rev up

lussasgraham · Post by **lussasgraham** » 02 Mar 2011, 18:31

mine has the same symptoms and it turns out to be a leaking intercooler.
Getting new one next week and pray the power returns.