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Ford Focus 1.6 TDCi 2005 - DPF temperature sensor question #

Posted by Martin Kelly on December 13, 2014, 3:28 pm

Year of Manufacture *: 2005
Engine Size and Code *: Peugeot engine
( Optional ) Scanner Used: IDS and Verus

Hi, I have an issue with the "DPF regen duration" (left DTC info at work) on this car, found split in upper DPF pressure sensor pipe so cut it back and refitted tubing. Live data when driving hard shows maximum pressure difference of 17 kPa and I checked it with a pressure gauge fitted to the upper pipe and on snap throttle I got about 1.5 psi so it looks like the cat-DPF is fairly clear, and the car drives fine.

My question is regarding the temperature sensor fitted to the cat-DPF - with the engine stone cold, IDS live data says 100 deg. C and Verus says 140 deg. C. Either way it's not at ambient temperature of around 6 deg. C. And when driving normally its behaviour is consistent at around 450 deg. C.
Driving it in 3rd gear at around 3000rpm it reached a maximum of 649 deg. C. ( using Verus ).

I am assuming that the temperature sensor should be showing ambient correctly and not the 100-140 as given above, and is the 100-140 temperature shift added to the actual reading causing the regen to be cut short due to the temperature being too high and logging the "regen duration" dtc?

Thanks, Martin.

Re: Ford Focus 1.6 TDCi DPF temperature sensor question

Posted by george ambelas <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3245' width='330' height='300' border=0 style='border:none;'> on December 13, 2014, 5:07 pm, in reply to "Ford Focus 1.6 TDCi DPF temperature sensor question"
George Ambelas

yes these temperatures are too high. have you taken voltage readings or scoped the temp. sensor?

Re: Ford Focus 1.6 TDCi DPF temperature sensor question

Posted by Martin Kelly <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2863' width='330' height='300' border=0 style='border:none;'> on December 13, 2014, 5:47 pm, in reply to "Re: Ford Focus 1.6 TDCi DPF temperature sensor question"

Not yet, the customer needed the car over the weekend and is dropping it back next week, I'll scope the temperature sensor voltage then.

Verus says at about 20 deg.c is 1-1.1v and 90 deg. C is 1.2 to 1.3v, is this about right?

Thanks, Martin.

Re: Ford Focus 1.6 TDCi DPF temperature sensor question

Posted by Tony Ludford <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5539' width='330' height='300' border=0 style='border:none;'> on December 14, 2014, 8:17 am, in reply to "Ford Focus 1.6 TDCi DPF temperature sensor question"
Tony Ludford

Not sure if it's relevant, but Kia DPF temperature probes don't measure below 134°/163° so displayed temp is that until it goes over that temperature....
I wonder if Fords do too?

Re: Ford Focus 1.6 TDCi DPF temperature sensor question

Posted by Martin Kelly <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2863' width='330' height='300' border=0 style='border:none;'> on December 14, 2014, 12:14 pm, in reply to "Re: Ford Focus 1.6 TDCi DPF temperature sensor question"

This temperature sensor starts increasing almost straight away.

I'll point the temperature gun at it when it comes back next week.

Thanks, Martin.