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

[cheshired5]

Originally Posted by concretegarage

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

That's a good start with the MAF then. Is it moving up from 14.63 g/s when you rev?

MAP should be 85-90 kPa at idle rising to 200+ at full (4.5k) revs which I know you can't achieve currently but 11 kPa is dreadful.

There's an easy MAP test if the MAF is reacting to engine speed so let us know what it's up to.

[concretegarage]

Originally Posted by cheshired5

That's a good start with the MAF then. Is it moving up from 14.63 g/s when you rev?

MAP should be 85-90 kPa at idle rising to 200+ at full (4.5k) revs which I know you can't achieve currently but 11 kPa is dreadful.

There's an easy MAP test if the MAF is reacting to engine speed so let us know what it's up to.

yes MAF is moving up when i rev!

sticker with the original bosch part number is missing from my MAP sensor... do you have a part number for me so i can find a new one on ebay.

[cheshired5]

Originally Posted by concretegarage

yes MAF is moving up when i rev!

sticker with the original bosch part number is missing from my MAP sensor... do you have a part number for me so i can find a new one on ebay.

Part No. is 8636216 and it's made by Denso.
You can unscrew MAP sensor and remove it but leave it plugged in electronically (ignition on+diagnostics ready) and blow/suck the tube to see if you can get a reading that way. Clean the tube first.
I can get mine to fluctuate between 80-120 kPa using this method.
If you have a vac pump, it's even easier still.
They're pretty reliable so test to make sure it's the sensor at fault.
Of the 3 plug wires, one is live (5 volts I think) one is ground and the centre is the signal so check the wiring also. The fact you're getting a signal even though the reading is poor suggests your wiring is ok but better to be sure.

[concretegarage]

Originally Posted by cheshired5

Part No. is 8636216 and it's made by Denso.
You can unscrew MAP sensor and remove it but leave it plugged in electronically (ignition on+diagnostics ready) and blow/suck the tube to see if you can get a reading that way. Clean the tube first.
I can get mine to fluctuate between 80-120 kPa using this method.
If you have a vac pump, it's even easier still.
They're pretty reliable so test to make sure it's the sensor at fault.
Of the 3 plug wires, one is live (5 volts I think) one is ground and the centre is the signal so check the wiring also. The fact you're getting a signal even though the reading is poor suggests your wiring is ok but better to be sure.

No response from senor when applying pressure/vaccum.
measured the connector... one pin is ground, one has 5v. and one is probably signal back to ecu.

[concretegarage]

i think this is the correct sensor for my car.

http://www.ebay.co.uk/itm/VOLVO-XC90...item3f463b3248

the denso sesor has two screws my only has one...

http://www.ebay.com/itm/Volvo-V70-II...item2a4adb2f09

[cheshired5]

Originally Posted by concretegarage

i think this is the correct sensor for my car.

http://www.ebay.co.uk/itm/VOLVO-XC90...item3f463b3248

the denso sesor has two screws my only has one...

http://www.ebay.com/itm/Volvo-V70-II...item2a4adb2f09

That's fair enough then.
We have the same D5244T engine but there can be small variances on individual parts over the model years as I found last year with an aux belt tensioner unit.
It's unlucky to have a MAF and MAP failure together on a D5 so I hope this solves your problem.
Let us all know.

[concretegarage]

just ordered a new MAP.
really wonder what made the MAP and MAF die!
battery was flat after i changed awd spline sleve... maybe low current could have caused the problem.... don't think that could have caused the problem.
Both MAP and MAF are on the same wiring loom..
when i got the car there was a hole in the pipe between MAF and turbocharger (now fixed) and the hose between intecooler and engine was cracked (now replaced) but the car was running fine until, i changed the awd spline sleve.
im thinking something should have caused these problems..... two sensor on the same wiring loom dying.. hmm

can i get the car out of limp mode with a normal obd2 fault code reader? or do i have to go to a volvo dealer?

[Horton]

You probably don't want to hear this but I'll put money on the fact that the work you have done replacing the Angle gear has disturbed something... The symptoms you describe sound like an air leak... Check your system again, and particularly the air system and vac pipes around the turbo area...

[cheshired5]

Originally Posted by Horton

You probably don't want to hear this but I'll put money on the fact that the work you have done replacing the Angle gear has disturbed something... The symptoms you describe sound like an air leak... Check your system again, and particularly the air system and vac pipes around the turbo area...

If the problem was an air leak, both sensors would have functioned fine through other tests but they didn't, they were both knackered.
The new MAF is now performing within spec and there's good reason to think the new MAP will do the same.

[cheshired5]

Originally Posted by concretegarage

can i get the car out of limp mode with a normal obd2 fault code reader? or do i have to go to a volvo dealer?

If the new MAP works and there's no further underlying fault, the engine will run fine.
Limp home won't be triggered and you can clear any codes (which will technically become historic).
Even a dealer can't clear a code if the root cause hasn't been fixed. The codes will just return.
I will say though, with the previously split pipes and unfiltered air, other issues may appear over time.....