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Ford Fiesta 1.6 TD 90PS 2010 - Under boost, code P0299 #

Posted by Nigel Bennett on May 19, 2014, 8:41 pm

Year of Manufacture *: 2010
Engine Size and Code *: 1.6 td 90 ps
( Optional ) Scanner Used: Dec
( Optional) Fault Codes: P0299

Ford fiesta 2010 1.6 td 90 ps
Present with code P0299 turbo under boost. This fault can be reproduced on road test but is not predictable as to what value it will occur at, but usually after about 3 miles.
So far we have checked;
checked waste gate actuator and vacuum supply.
Smoke test,slight leak through waste gate actuator shaft, very minor.
Map sensor tested against gauge.
Fuel pressure appears to respond to expected values.

Looking at the data log we recorded the turbo is capable of producing boost and spooling up in response to stabbing the throttle,but when the fault occurs the boost is rising at a steady rate.
Any help would be appreciated,regards Nigel..

Re: Ford fiesta under boost

Posted by Mark carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on May 19, 2014, 10:29 pm, in reply to "Ford fiesta under boost"
Mark Carter

Loads of things come to mind, what's the history of the vehicle and fault?

Modern cars, Its all wizardry and witchcraft

Re: Ford fiesta under boost

Posted by Nigel Bennett <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5463' width='330' height='300' border=0 style='border:none;'> on May 20, 2014, 5:46 am, in reply to "Re: Ford fiesta under boost"

Hi Mark.we have serviced the vehicle for 12,500 mile
now on 76,852 miles.vehile presented last week with throttle pedal position sensor p193b fault,
customer said vehicle was not responding to any input from pedal,tested pedal assembly couldn't make it fail but replaced it as i couldn't be certain give time restraints (vehicle dropped on us )
gave vehicle back to customer a day or so later we had P0229 this code was not present at time of throttle fault.regards Nigel.

Re: Ford fiesta under boost

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on May 20, 2014, 7:13 am, in reply to "Re: Ford fiesta under boost"

So it may be worth starting with the basics, has the inlet been checked for restrictions & is the air mass ( if fitted) reading correctly?

Has the exhaust been checked for restrictions, is the EGR valve closing as it should.

Has the turbo been checked for play / clearance?

Has the supply for the control valve been load tested, is the PWM signal being pulled to earth ?

What pressure do you have on the supply side of the control valve, how much of it is getting though the valve with a high duty cycle applied?

Modern cars, Its all wizardry and witchcraft

Re: Ford fiesta under boost

Posted by Nigel Bennett <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5463' width='330' height='300' border=0 style='border:none;'> on May 21, 2014, 8:25 am, in reply to "Re: Ford fiesta under boost"

Hi Mark. were having the PCM up dated at our local dealer as i don't have IDS.
After getting back from road test yesterday morning i was re-playing the road tests and it seems the actual map value and the expected are 28 mb at the worst case behind actual lower.Data from max load and acceleration are,
map:200 mb actual 189
air flow 800 mgs
The above are from memory,DEC doesn't appear to let me play the logs without being connected to the vehicle !
If the pcm up date doesn't help more testing and perhaps you have some known good data we could compare against?
Regards Nigel.

Re: Ford fiesta under boost

Posted by Nigel Bennett <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5463' width='330' height='300' border=0 style='border:none;'> on May 21, 2014, 8:12 pm, in reply to "Re: Ford fiesta under boost"

Update...........
Pick up vehicle from dealer after having PCM software update
Applied,so far so good.
I was thinking about how this fault might have be propagated
From the first fault with the pedal assembly,I believe that clearing this code would have reset the adaptions and
Consequently the PCM viewed the output from the aged turbo and engine,as outside it's stored values in its original map.
Time will tell.
Thanks Mark regards Nigel.

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