C5 FAP removed but

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citrokid
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C5 FAP removed but

Post by citrokid »

i had the FAP removed from the ECU and the FAP removed about 18 K miles ago, all went Ok until about 2 days ago when the mesage of risk of filter blocking came on. I have looked with lexia and cannot see anything unusal. I monitored the engine while driving and the DP cell is reading a variable pressure depending on the engine speed.
Any ideas as to what is happening would be appreciated
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Post by cachaciero »

What is the pressure ? would have expected the diff pressure across the empty canister to be pretty well zero UNLESS one of the pressure lines to the diff switch is open to atmosphere.

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Post by MikeT »

Could the ECU be relying on additive/tank refill counters and/or last regeneration cycle mileage?
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Post by corsehf »

Have you disconnected the plug from the sensor at the top of the bulkhead??
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Post by The Birdman »

What size of engine is in the c5 ?
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citrokid
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Post by citrokid »

cachaciero wrote:What is the pressure ? would have expected the diff pressure across the empty canister to be pretty well zero UNLESS one of the pressure lines to the diff switch is open to atmosphere.

cachaciero
the filter was punched with holes.
the Delta P at approx 70 mph at 3000 rpm was approx 11 mbar. o at tick over RPM.
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Post by citrokid »

MikeT wrote:Could the ECU be relying on additive/tank refill counters and/or last regeneration cycle mileage?
counter 1 and 2 are set at 0
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Post by citrokid »

corsehf wrote:Have you disconnected the plug from the sensor at the top of the bulkhead??
No because i dont know what sensor you are referring to here , can you explain please.
is it the lambda sensor ?

The engine is a 1.6 HDi fitted to a C5
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Post by The Birdman »

The plug at the top is the differential pressure sensor and if your engine is the 1.6hdi and it has a combined additive and engine ecu then these sensors have to stay on , was it a simple dpf off map ,because that particular engine has been giving problems unless you change a reading at the start of the map as well as doing a dpf off.
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citrokid
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Post by citrokid »

The Birdman wrote:The plug at the top is the differential pressure sensor and if your engine is the 1.6hdi and it has a combined additive and engine ecu then these sensors have to stay on , was it a simple dpf off map ,because that particular engine has been giving problems unless you change a reading at the start of the map as well as doing a dpf off.
It is the 1.6 HDI.
The differential pressure sensor is still connected and reading.
it was dpf off map implemented by using ECU safe ,
what is the reading at the start of the map that has to be changed ?
and how is that done ?
can ECU safe do it ?
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Post by The Birdman »

I had DPF off but caused loads of regens / limp modes / white smoke , the guy who mapped it said there was i reading at the start of the map that needed to be changed because it is a combined engine/additive ecu , the ecu safe program will not get all values , i`m sorry i never paid more attention but it was a ohm value at the start that needed changing , i could get you in touch with my mapper but you would have to travel to North Antrim or send your file i would think, don`t know the cost as i got remap at same time from 110bhp to 146.3bhp.
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citrokid
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Post by citrokid »

The Birdman wrote:I had DPF off but caused loads of regens / limp modes / white smoke , the guy who mapped it said there was i reading at the start of the map that needed to be changed because it is a combined engine/additive ecu , the ecu safe program will not get all values , i`m sorry i never paid more attention but it was a ohm value at the start that needed changing , i could get you in touch with my mapper but you would have to travel to North Antrim or send your file i would think, don`t know the cost as i got remap at same time from 110bhp to 146.3bhp.
Can you sent me a PM with an email address pls
I can send the ECU file
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Post by The Birdman »

Give him a ring first to see what he recommends (Davey Wishart) you can google him to get reviews, you`ll have to make sure there are no fault codes in the file you send him i would think, he`ll also block all can fault signals for the dpf as well , theres probably nothing wrong except fault codes weren`t blocked.

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Post by corsehf »

citrokid wrote:
corsehf wrote:Have you disconnected the plug from the sensor at the top of the bulkhead??
No because i dont know what sensor you are referring to here , can you explain please.
is it the lambda sensor ?

The engine is a 1.6 HDi fitted to a C5
This sensor measures the pressure differential between the start and end of the DPF. When i had my DPF 'turned off', i was told to disconnect this sensor because although it is no longer needed, it could still be supplying useless info to the ECU and throwing it into limp home mode due to not understanding why it is receiving info for something that is no longer fitted.
Andy

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2001 Omega 2.2DTi Est (stolen by Ex!!)
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The Birdman
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Post by The Birdman »

corsehf wrote:
citrokid wrote:
corsehf wrote:Have you disconnected the plug from the sensor at the top of the bulkhead??
No because i dont know what sensor you are referring to here , can you explain please.
is it the lambda sensor ?

The engine is a 1.6 HDi fitted to a C5
This sensor measures the pressure differential between the start and end of the DPF. When i had my DPF 'turned off', i was told to disconnect this sensor because although it is no longer needed, it could still be supplying useless info to the ECU and throwing it into limp home mode due to not understanding why it is receiving info for something that is no longer fitted.
Depends if your additive Ecu is combined with Engine Ecu or not, 1.6hdi combined needs DPF sensor connected.
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