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VW Polo 1.4 (16V) BBY 2003 - Fault code 17961, Map pressure signal implausible #

Posted by Barnaby Donohew on December 22, 2008, 6:08 pm

Vehicle Model *: Polo
Engine Size *: 1400
Engine Code *: BBY
Year of Manufacture *: 2003

We have a 2003 VW Polo 1.4 16V (BBY) Auto that intermittently throws up the following fault code: "17961 - Barometric / Manifold Pressure Signals: Implausible Correlation P1553 - 35-10 - - - Intermittent".

Suspect from reading previous postings that incorrect tension of the twin timing belts may cause this fault code. I will check this as a matter of priority but before reading the posts I checked the inlet manifold vacuum at idle: the mityvac gave a value of approx 16 in. Hg. This seems a bit low to me, can anyone confirm that I should be getting something closer to 20 in. Hg.? Thanks, Barney.

Re: VW Polo 1.4 (16V) BBY 2003 MAP fault code

Posted by Darren Jones <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5495' width='330' height='300' border=0 style='border:none;'> on December 22, 2008, 6:26 pm, in reply to "VW Polo 1.4 (16V) BBY 2003 MAP fault code"
Darren Jones

Hi Barney, i seem to think that John Battern mentioned this on one of our courses & it turns out to be dirty throttle body.Are you on GDI course in Janaury, hope your well, Darren

Re: VW Polo 1.4 (16V) BBY 2003 MAP fault code

Posted by Glyn Morgan <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2543' width='330' height='300' border=0 style='border:none;'> on December 22, 2008, 6:54 pm, in reply to "Re: VW Polo 1.4 (16V) BBY 2003 MAP fault code"
Glyn Morgan

Hi Barney

Darren beat me to it

, would expect 20" on a healthy correctly timed engine.

Also after cleaning throttle body, reset adaptions.
Hope you are well.

Glyn

Re: VW Polo 1.4 (16V) BBY 2003 MAP fault code

Posted by Barnaby <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1702' width='330' height='300' border=0 style='border:none;'> on December 23, 2008, 9:46 am, in reply to "Re: VW Polo 1.4 (16V) BBY 2003 MAP fault code"
Barnaby Donohew

Hi Darren & Glyn! Am not too bad now thanks - the cold has gone! Hope you're both ready for xmas etc!

Will have a look at the throttle body but it might be worth knowing a bit more about the car's history...

This car has come via a friend of the family from South London who previously have been taking it to their local VW dealer. Here's a list of what it has had so far:

- EML on at 7,340 miles (Apr 04): No faults found but ECU updated!
- EML on at 17,405 miles (August 08): Found that oil was over-excessively filled. So it was drained and replaced. At the same time the vehicle speed sensor was replaced.
- Cam-belt replaced at 30,000 miles (May 07).
- EML on at 37,215 miles (April 08): EGR fault found. Throttle body cleaned and EGR valve fitted.
- EML on at 39,743 miles (August 08): MAP replaced.
- EML on again! (August 08): Throttle body cleaned & basic setting performed.
- EML on... (August 08): Compressions checked, they suggest it is low on cylinder 1 and suspect valve seats, requiring removal of cylinder head etc.

This is the point at which we have been given the car. We have checked compressions and can't see that no. 1 is low! Hence this is why I wanted to start checking engine timing etc.

You can't believe how much they have spent on the car up to this point! On the plus side I suppose we can have a good guess at what isn't causing the problem!

Cheers,
Barney.

Re: VW Polo 1.4 (16V) BBY 2003 MAP fault code

Posted by Darren Jones <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5495' width='330' height='300' border=0 style='border:none;'> on December 23, 2008, 9:35 pm, in reply to "Re: VW Polo 1.4 (16V) BBY 2003 MAP fault code"
Darren Jones

Hi Barney, looks like you have got your work cut out here. I looked on ESi & the BARO uses the MAP sensor when the ignition is switched on & engine not running to find atmospheric pressure. There is a 5 volt link between EGR position sensor & MAP sensor.ESi also gave me the figures for MAP sensor engine idling & i think it was between 280mbar - 420mbar but my memory is fading at this time of night with a few chrismas cheers inside me, i will check tomorrow.I think your right by chasing why you have only 16" of vacuum, cam timing but having a belt change 18 months ago you like to think that is has been correctly, EGR being replaced so you would of thought that should not be stuck open , there could be air leak or exhaust blocked.I would like to know why the EGR was changed because of link between the EGR position sensor & map sensor, wiring fault may be, the 5 volt feed also goes into cam sensor.I know Rob that has been on a few course had a similur fault and it was the EGR connection plug full of water, may be cam sensor connection plug full of water.I have never experienced this fault in our garage but i hope this helps Darren

Re: VW Polo 1.4 (16V) BBY 2003 MAP fault code

Posted by Darren Jones <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5495' width='330' height='300' border=0 style='border:none;'> on December 23, 2008, 10:04 pm, in reply to "Re: VW Polo 1.4 (16V) BBY 2003 MAP fault code"

Re: VW Polo 1.4 (16V) BBY 2003 MAP fault code

Posted by Barnaby Donohew <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1702' width='330' height='300' border=0 style='border:none;'> on December 24, 2008, 11:28 am, in reply to "Re: VW Polo 1.4 (16V) BBY 2003 MAP fault code"
Barnaby Donohew

Cheers Darren, will set to it after xmas now! We have the (relative) luxury of being able to keep the car as long as we please!

Happy Christmas to you. Barney.

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