Limp Home Error Code 17563

[wilkinsonbaz]

hi going on holiday soon and need to sort out my galaxy and its limp home problem

kept going into limp mode so have read loads of forums

i changed all vaccuum pipes except one to ecu (it seems ok) N75 seems to work ok

made sure turbo actuator has smooth movement

tried disconnecting vacuum pipe near N75 valve so no vaccuum to turbo so i had no turbo boost i presumed this meant turbo vanes werent sticking

the second you reconnect vaccuum pipe full boost straight away

just got a vagcom cable the error code that shows up and it comes up every time i go into limp mode is 17563 P1155 which from searching means

manifold absolute pressure sensor circ. short to b+

does this mean the map sensor on the ecu is faulty or is still caused by under/over boost from turbo or something else?

only got a couple of months to get it sorted so hoping someone can point me in right direction

 

thanks john

[Mirez]

MAP sensor lives on the intercooler pipework, open the bonnet and look at the big pipe to the right side of the engine. Its the sensor on that. Short to B+ means its a 12V short (ie direct) so either the sensors goosed or the wiring is.

[chrispb123456]

hi going on holiday soon and need to sort out my galaxy and its limp home problem

kept going into limp mode so have read loads of forums

i changed all vaccuum pipes except one to ecu (it seems ok) N75 seems to work ok

made sure turbo actuator has smooth movement

tried disconnecting vacuum pipe near N75 valve so no vaccuum to turbo so i had no turbo boost i presumed this meant turbo vanes werent sticking

the second you reconnect vaccuum pipe full boost straight away

just got a vagcom cable the error code that shows up and it comes up every time i go into limp mode is 17563 P1155 which from searching means

manifold absolute pressure sensor circ. short to b+

does this mean the map sensor on the ecu is faulty or is still caused by under/over boost from turbo or something else?

only got a couple of months to get it sorted so hoping someone can point me in right direction

 

thanks john

 

Hi John Is yours a MK1 or 2 as iirc the map's on the ECU behind the dash on the MK1 and on the intercooler pipework on MK2

[wilkinsonbaz]

hi its a mk1 99t plate

do you think it might be worth taking out the ecu to have a look at the map sensor

i'm guessing its more a faulty map sensor rather than a boost or pipe leaking

when i ran it with the vacuum pipe from the n75 valve disconnected(no boost) it ran fine apart from bit sluggish, (had a nissan serena 2.3d non turbo before galaxy so used to sluggish performance!) but it never went into limp home mode tried it by keeping engine running reconnecting pipe and boost was there straight away so it wasn't in limp mode, the map wasnt sensing under boosting

read the post about renewing the pipe inside the ecu to the map sensor was going to try that at weekend

thanks john