DFP and EGR sensors normal ohm values?

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DFP and EGR sensors normal ohm values?

Post by Axa » 08 Nov 2017, 08:11

I can't find any info on the Heynes Bible. Do anyone know what recistances should be in the pressure difference sensor when the filter are unblocked, and in the EGR heat sensor when hot?
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Re: DFP and EGR sensors normal ohm values?

Post by EDC5 » 12 Nov 2017, 13:14

I think the best way to assess sensors is by looking at live data from Lexia / Diagbox. That way you are seeing the actual values and not the raw voltage / resistance reading.
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Re: DFP and EGR sensors normal ohm values?

Post by Axa » 12 Nov 2017, 15:52

I got Lexis. But unfortunately no pc to run it on. It would amaze me if no one knows what recistance the sensors in the exhaust system are working in. Anyone?
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Re: DFP and EGR sensors normal ohm values?

Post by GiveMeABreak » 12 Nov 2017, 15:56

Post or PM your VIN and I'll have a look - as there could be different settings dependent upon type fitted and engine.
Actually, scrub that - I've had a look and there is no reference I can find for that sort of information in the technical docs.
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Re: DFP and EGR sensors normal ohm values?

Post by Axa » 12 Nov 2017, 16:22

Aaah thanx Mark! :-)

vin: VF7RE9HZC76736633. (I also updated my signature with the vin number)
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Re: DFP and EGR sensors normal ohm values?

Post by GiveMeABreak » 12 Nov 2017, 16:26

I've just spent the last half hour looking through for another MK II 1.6 110 HDi with the particle filter and there is everything about how it works - but there are no details as to the resistances I'm afraid.
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Re: DFP and EGR sensors normal ohm values?

Post by Axa » 12 Nov 2017, 18:36

Ok. Thanx anyway for the effort Marc!
The reason I'm asking is that I need to run this car without DPF and ERG. This is our secondary car and only gets used on short drives and often cold starts (due to I often work on call, fire and rescue..) so I have been struggling allot with blocked DPF and the intake manifold and exhaust valves getting clogged with oil mixed soot from the EGR..
I need to fake the correct values on the sensors to turn off the engine light. I think 10K ohm might work at the temp sensor, so I'm going to try 10k on both and see..
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Re: DFP and EGR sensors normal ohm values?

Post by GiveMeABreak » 12 Nov 2017, 18:57

The Injection ECU will determin the number of successful regenerations (or not) over a distance of so many miles and if the particle filter requires a regeneration and previous attempts have not occurred it will kick in a programme of more frequent regeneration until such time as it does. If this is not done the warning will come on and you should drive at least 50KMH for half an hour or so to allow it to regen.

As you know from the AUP we don’t condone DPF / EGR disabling, but try to encourage repair or corrective action. If it has become clogged, the DPF can be light or deep cleaned these days with chemical cleaners injected in. Even Halfords do them for a reasonable cost.
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Re: DFP and EGR sensors normal ohm values?

Post by Axa » 14 Nov 2017, 09:33

I agree DPF should be kept in working order as intended with people's health in mind. If I had known about this issue before buying a diesel I would surely have avoided anything with an DPF, DMF or EGR. If I could afford I would replace this car for an petrol or even electric car. However our C5 have really low resale value due to dents, scars, rust on the hatch, cracked front window and plastic in several places and plenty of other wear and tear. So the only sensible thing is to keep it running for as long as possible. But that simply won't work with an DPF since we need 6seats for most drives long enough for regeneration to be fulfilled.
The engine are good on consumption compared to most other alternatives in the family estate car segment. And with a college running an Diesel Ford F250 pickup truck. Well then my conscience is not too bad..
I think it's very good you promote to keep EGR and DPF in working order!! But unfortunately reality does not always fit in that well with that ideology..
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Re: DFP and EGR sensors normal ohm values?

Post by GiveMeABreak » 14 Nov 2017, 10:24

Not quite sure I understood "we need 6seats for most drives" ? can't you just take it for a run to allow regeneration to take place?

I Just clocked you are in Norway - but there must be plenty of places that offer a DPF clean service - and if not too badly blocked can be done with the exhaust / DPF on the vehicle. Failing that, try and locate somebody with a Lexia and do a forced regeneration.

I really doubt putting resistors on the pressure sensors is going to help for long - once the filter gets to a certain stage of blockage (anything from 70% up) it may become impossible to clear with regeneration. Once that happens the car will just stay in limp home mode I suspect. That would be a shame for the sake of a clean though.
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