Diesel Diagnostics

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Ford Fiesta 1.4D 2009 - AMM waveform? #

Posted by Mark Robins on June 17, 2014, 4:58 pm

Year of Manufacture *: 2009
Engine Size and Code *: 1.4 Diesel
( Optional ) Scanner Used: Autocom/Picoscope
( Optional) Fault Codes: None

Hi Gents,
Can anyone tell me if I'm loosing my marbles!! Scoped the AMM on this vehicle (Digital) and the frequency "decreases" on acceleration!

Re: Fiesta

Posted by Andy Gravel <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3642' width='330' height='300' border=0 style='border:none;'> on June 18, 2014, 7:08 am, in reply to "Fiesta "

Hi Mark, just a thought, I'm not sure about the digital AMM, but I know if the non digital ones are fitted the wrong way around they give the opposite waveform to what's expected. It certainly not what I would have expected to see. Kind regards, Andy

Re: Fiesta

Posted by Mark Robins <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3563' width='330' height='300' border=0 style='border:none;'> on June 18, 2014, 8:58 am, in reply to "Re: Fiesta "
Mark Robins

Hi Andy,

Great minds think alike (or stupid ones!) I'm going to check it this morning, I also thought to blow through it with a vacuum cleaner (or suck) while scoping it to see the results, possibly I thought something might be strangling the air intake; possibly a throttle valve, will report my findings.

Mark

Re: Fiesta

Hi Gents,

Re-checked this morning with no air passing through the AMM I have approx. 15 kHz and at tick-over I have approx. 4khz so this meter does indeed work in the reverse compared to other digital AMM I have checked in the past. Question is is that OK, live data is confirming my results but no fault codes are logged and the car billows black smoke!
Help!!

Re: Fiesta (Update)

Ok folks,
Checked with AD and this is in fact the way they work! Makes you wonder why the hell they keep changing things!!

Re: Fiesta (Update)

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on June 18, 2014, 9:53 pm, in reply to "Re: Fiesta (Update)"

I know you have had it confirmed by AD (I have only just seen your post) but for what its worth I can second the fact that the Frequency can decrease with air mass with some vehicles.

Mark

Modern cars, Its all wizardry and witchcraft

Re: Fiesta (Update)

Posted by Steve Sneap <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5333' width='330' height='300' border=0 style='border:none;'> on June 19, 2014, 8:18 am, in reply to "Re: Fiesta (Update)"
Stephen Sneap

Just had similar fault on a combo van excessive black smoke, turned out to be a split on hose after the intercooler ,Just a thought.
Steve Sneap

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