D5 (D5244T to 2005) xc90 limp home and fault code 102,112&237 HELP

[concretegarage]

i have a 2004 xc90 d5 163bhp

after i changed the spline sleve for the awd, the car went into limp home mode.

idles perfect but it wont rev over 3000rpm. i have e obd2 fault code reader (deleting codes dosnt help.) and i get tree fault codes:

P0102 -- ECM-121D -- Mass air flow sensor -- Signal too low

P0112 -- ECM-131C -- Intake air temperature (IAT) sensor inlet -- Signal too high

P0237 -- ECM-125D -- Charge pressure sensor -- Signal too low

i have cleaned all the connectors, and i cant see any damage to the wiring...

[cheshired5]

What are the MAF grams per second at idle and when held at 1,2 and 3k revs?

[concretegarage]

Originally Posted by cheshired5

What are the MAF grams per second at idle and when held at 1,2 and 3k revs?

just checked datastream... maf 0.52 g/s at idle.
an it just stays there when i try to rev it up.
only thing that changed the maf value, was me tapping my finger against the maf housing, then the value fell and raised up to 0.52 g/s shortly after.

[cheshired5]

MAF should read 13 g/s at idle and there should be a smooth rise in this value in line with revs. 3k revs would be around 60 g/s from memory.
If all airways are clear, air filter clean and all hoses are secure and leak free, the MAF may just need a clean with a proper MAF cleaner like CRC. Don't use carb or brake cleaner.

What MAP (Manifold Absolute Pressure) psi are you getting at idle and different revs?

[concretegarage]

Originally Posted by cheshired5

MAF should read 13 g/s at idle and there should be a smooth rise in this value in line with revs. 3k revs would be around 60 g/s from memory.
If all airways are clear, air filter clean and all hoses are secure and leak free, the MAF may just need a clean with a proper MAF cleaner like CRC. Don't use carb or brake cleaner.

What MAP (Manifold Absolute Pressure) psi are you getting at idle and different revs?

i allready cleaned the maf sensor :-) no differense.
map sensor is stuck at 11kpa...

i don't know how this car should be, just baught it cheap because the awd didnt work. i drove it home it felt normal... i changed the cambelt on this car a year a go for the guy i baught it from, i then taught it was a really slow car, but i reved over 3000rpm.. maybe it allready had a fauly map sensor, and a maf sensor starting to give up?

is the conclusion to change maf and map sensor?
is the ebay (china) maf and map sensors any good?

thank very much for your help!

[cheshired5]

Starting by changing the MAF and do not at any cost buy anything other than genuine Bosch. A used genuine is better than a new copy so scour ebay or breakers. It should cost around £30/€40
See how you go from there first before messing with the MAP.

[outnumbered]

Rear engine mount vac pipe.
mike

[concretegarage]

Originally Posted by outnumbered

Rear engine mount vac pipe.
mike

does blocking of this cause any problems? (see red line in picture)
incase one of the engine mounts leak?

[outnumbered]

Originally Posted by concretegarage

does blocking of this cause any problems? (see red line in picture)
incase one of the engine mounts leak?

it will help if you have any issues with the car.
block them of and see what happens if the car is okay you have found the fault belive it or not the vac engine mounts can give you limp mode.
mike

[concretegarage]

Originally Posted by cheshired5

Starting by changing the MAF and do not at any cost buy anything other than genuine Bosch. A used genuine is better than a new copy so scour ebay or breakers. It should cost around £30/€40
See how you go from there first before messing with the MAP.

just replaced the maf sensor (genuine bosch)
fault code on maf gone! maf is about 14.63 g/s at idle.

map sensor is stuck on 11kpa.

still won't rev over 3000rpm.
and still has following fault codes

P0237 -- ECM-125D -- Charge pressure sensor -- Signal too low
P0101 Mass or Volume Air Flow Circuit Range/Performance Problem