code P1252, p0299, p0102 ?

007husky · **Posted:** Wed Feb 20, 2008 11:45 am

Hey

new owner of a crd and first ever diesel owner.

Got my jeep about a week ago and already spent countless ours reading and fighting with the Forum search engine.

Did the ORM thing, new oil (M1 5w40 fully synth) and checked for most of the stuff that goes wrong on the jeeps.

I use a scanguage II to take codes out and i got this codes.

P0299 Turbo/super charger – low boost Mechanical fault
P0102 Mass air flow (MAF) sensor/volume air flow (VAF) sensor – low input Wiring short to ground, MAF/VAF sensor, ECM
and
p1252 ????

I m not sure where they came from, the computer showed no CEL till i did the ORM.

While i was stupid this morning, i heard the AC compressor kick in when the heat was on and figured i needed to do the mod for the AC, but in the meantime till the weekend arrives, i would just take the fuse ( out of the engine bay compartment) so the clutch of the AC doesn't engage. The fuse is marked clearly for the AC and i think is 20 or 30 amp little fellow.

when i got to work, (30 mile commute) I decided to pull codes this morning just for kicks and found this other 2 codes. (the turbo charger one, really really scares me)

The jeep has all the dealer recalls (freaking prev owner).

thanks !

PS: Also since is my first diesel (drove before diesels at the Fire station but are a horse of a diferent color(red) ), on my truck i hear all kind of noises... including what sounds like a ping under acceleration (i m used to gas engine sounds, so is dis concerning)

-------------------------
Liberty CRD 2005
25 K miles
ORM
Happy owner.

05infernoCRDL · **Posted:** Wed Feb 20, 2008 11:55 am

your MAF code is due to the ORM (get on the list for the SEGR)

Your turbo charger code might be the same.

sometimes i hear the ECU will tanspose the last two digits so you might have a code P1225 instead of P1252

Other will chime in and correct me where i am wrong.

Sir Sam · **Posted:** Wed Feb 20, 2008 2:35 pm

05infernoCRDL wrote:

your MAF code is due to the ORM (get on the list for the SEGR)

Your turbo charger code might be the same.

sometimes i hear the ECU will tanspose the last two digits so you might have a code P1225 instead of P1252

Other will chime in and correct me where i am wrong.

no, the codes can only get transposed with the key trick to read em

007husky · **Posted:** Wed Feb 20, 2008 3:11 pm

cleared the codes.

Went for a ride (still AC fuse unplugged)

p0102 came back
p1252 came back

boost pressure seemed low 17 may be 18 on the scangauge map (even under hard accel)

made a stop,

cleared codes, re plugged the AC fuse (on the fuse box inside the engine compartment)

started seeing map pressures in 19-20s witch still seems low. but may be i have the refresh rate too slow on the scangauge and not steping on it, for long periods of time.

p1252 remains, as the only code now. As soon as i clear it comes back ( ORM code probably, but cant find it in the list of codes. )

bdptp73 · **Posted:** Wed Feb 20, 2008 3:41 pm

Only thing I can find for code 1252 is #2 fuel injector fault. If thats the case I hope your still under warranty those puppies are pricey. I had a fuel injector go bad on me before I had a scanguage so I don't know what the code was for that one.
I had code 102 and 299 and the dealer changed the FCV, tightened a loose boost hose clamp :roll:

, and replaced the MAF sensor. I left the dealer and the MIL popped back on 5 miles down the road, P105 this time and they changed the MAP sensor. No problems in a month since then. I think they were just throwing parts at it though.

007husky · **Posted:** Wed Feb 20, 2008 4:47 pm

There is a few people that had this code p1252 with a vacum line, badt turbo hose or some bad celenoid.
I ll replug the ORM mod, check vacum lines and turbo hoses and see if it gets out of limp mode.

Not bad for my first week of ownership

ATXKJ · **Posted:** Wed Feb 20, 2008 5:43 pm

boost pressure of 17-18 on the scangauge sounds like a blown turbo hose (not sure about the codes)

crd liberty · **Posted:** Wed Feb 20, 2008 5:47 pm

007 Also disconnect the battery for just abit and let it
learn all over again
Steve

007husky · **Posted:** Wed Feb 20, 2008 6:37 pm

Disconected the battery, checked all vacum, turbo hoses to interc, and to the engine, made sure all sensors connections etc were good.

no luck.

I clear the code and the cel goes off for 1 second and p1252 comes right back.

Update:

2/21 At the dealer now, a mechanic friend said it sounded like a bad accel pedal sensor. hopefully is still under warranty

007husky · **Posted:** Fri Feb 22, 2008 12:32 pm

Dealer called today and said that is the vacum selenoid ( im asuming for the turbo) and that will take a few days to get the part.

Is this a standard part that i can get any other place than a dealer?

i feel like an idiot, i just found a thread with the exact same problem as mine.

I m sorry. i ll try to search more next time.

crd liberty · **Posted:** Fri Feb 22, 2008 1:06 pm

http://www.trademotion.com/partlocator/ ... atalogid=0

chadhargis · **Posted:** Fri Feb 22, 2008 1:42 pm

A P1250 is the boost control solenoid. That's what was wrong with mine. A whopping $23 part. Very easy to replace.

The P299 is an underboost code. Since the solenoid is not allowing the VGT turbo vanes to work properly, proper boost is only attained at a specific RPM, not across the rev range as it should be.

I've had a couple of issues with my CRD, but they were cheerfully fixed under warranty by my excellent local dealer, Hansen Jeep. Even after a tornado hit the parts depot, killing two employees, my service manager sourced the part from somewhere else and got me back on the road. Great service.

Now...once the warranty period is over, I'll be saving for the Suncoast TC and looking for a shop to install it.

Spowers · **Posted:** Wed Feb 27, 2008 5:46 pm

Gald you got it!

I ordered mine from the above dicount Mopar link - got it in 3 days - plugged it in and Good to Go!!!

The negative pressure line ( line that goes to the accumilator) will be tuff removing - there will still be some vaccum holding it on. Save that one for last so you do not "over pull" anything else once it finally lets go.

crd liberty · **Posted:** Wed Feb 27, 2008 6:08 pm

This is the 2nd or 3rd time I have sent that link to the solenoid
and parts related in the last week or so. I don't have any problems
yet with mine(27,000 miles).
But, seeing as how this keeps popping up more and more on the
Forum. Same parts, same problems, same codes, my ? to all
the hard hitters, mechanics, etc. Is this little filter and solenoid
really important to the boost and could you tell me in laymans terms
how this gadget controls the boost pressure?
I am not a mechanic, so please be nice.
Steve

Spowers · **Posted:** Thu Feb 28, 2008 9:47 am

Here is my take :
The Vanes on the turbo are controlled by vacuum.
More boost is caused by increased pitch on the vanes.
The solenoid increases vacuum to the actuator thus increasing the pitch.
Thus increasing the boost.

Mine was somewhat binary - mostly 1/2 boost - then all of a sudden - 100% boost - then back off again.

Again I could hear it at idle - the exhaust note was quite - then loud - then quite - then loud.

This was caused by the solenoid triggering the actuator then failing then triggering then failing.

Please note this was my particular case, this may not be the norm.

crd liberty · **Posted:** Thu Feb 28, 2008 10:01 am

(Charge Air Ducting and Boost
Pressure Control
Both the boost and intake pressures are
used to control the wastegate of the
turbocharger. These pressure signals are
supplied to the ECM, which then sends
a pulse-width modulated signal to the
Wastegate Bypass Regulator Valve N75. As
a result N75 controls vacuum supply to the
Pressure Unit, which directly acts on the
wastegate via a connecting rod. This control
system regulates the turbine speed and
sets the maximum boost pressure.
If the control system fails, the
boost pressure acts directly on
the pressure unit. The increased
spring pressure reduces maximum
boost down to minimum boost.)

This is what I found this morning. I realize it is a VW turbo, but our
KJ must be similar in design
What you guys think?
Steve

nursecosmo · **Posted:** Sun Mar 02, 2008 5:53 pm

Well, mine went bad today as well. All the same symptoms and codes. Were everyone else's problems determined to be the solenoid or the modulator?

crd liberty · **Posted:** Sun Mar 02, 2008 6:01 pm

No comment.
I have been trying to say this before, to all deaf ears. This little
gadget does have some control over our turbos, don't you think?
Steve.
Yea, I know, I am not here, showed my butt the other day over
this same issue and have been laying low.
Please advise of the resolve problem, though I think I already know.
Steve

nursecosmo · **Posted:** Sun Mar 02, 2008 10:53 pm

crd liberty wrote:

No comment.
I have been trying to say this before, to all deaf ears. This little
gadget does have some control over our turbos, don't you think?
Steve.
Yea, I know, I am not here, showed my butt the other day over
this same issue and have been laying low.
Please advise of the resolve problem, though I think I already know.
Steve

Of course it has control over the turbo. That is why it is called boost control solenoid, same as the VW control solenoid you posted about earlier. Did you read the wiki link that I sent you?
http://en.wikipedia.org/wiki/Boost_controller
http://en.wikipedia.org/wiki/Variable_g ... rbocharger
It seems like it is going to be another problem area for for the CRD. At least its cheap and easy to fix.

nursecosmo · **Posted:** Tue Mar 04, 2008 3:26 pm

Got the new solenoid today, put it on and the tractor is back to it's zippy old self but I still have a 1252 which wont clear out. Any Ideas?

code P1252, p0299, p0102 ?

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