Pump & Pilot Learns

[Coley3159]

Hi All,

Last October I installed new injector seals and was wondering if its worth doing the pump and pilot learns with Forescan? I have been looking for a guide on how to do them correctly but cant find the information?

The engine can hunt slightly when starting up from cold and also when pressing the clutch. The engine sounds slightly rough and I was wondering if doing these learns will help it run smoother?

If doing the learns and it fails do I run the risk of putting the van into limp mode?

Any help would be much appreciated.

Thanks.

[DanMK7uk]

Yes, certainly worth doing.its a service procedure which many neglect.

To confirm is yours euro 4 ? Else its non applicable.

Yes it should help smooth things out, however if your scv is not healthy it may still require replacing anyhow. Some even clean them out, but genuine Denso valves can be had for 60 bob. Watch out for fakes !

Its a good starting point running the learns however.

Clutch in can make them hunt. Fairly normal.

Other than that it would suggest fuel pressure may be a little out due to scv often.

Go on to the service functions on forscan, it will run you through the process, reset prv open duration, fuel pump learn followed by injector pilot learn. All simple to follow .

Tbh as long as the van starts and drives id be surprised if it caused any issues with it failing, they sometimes fail due to fuel temps, id recommend doing on a cold engine and bring it up as your doing it.

Cheers

[DanMK7uk]

To add, replacing the seals would not require learns as nothing is being altered in terms of fuelling but again its well worth doing. Annual maintenance imo.

Let us know how you get on.

[T350camper]

Hi Dan,

Is that the same for Mk6? Forscan says mine is a 2005 model year (although registered in 2006) 2.4 TDCI 135bhp RWD

Van runs very well, and since blanking the EGR there is no visible smoke from the exhaust. Only slightly annoying issue is a bit of a lumpy idle, although it never feels like it might stall, just has a tiny miss which stops as soon as any throttle applied (even by 50rpm). Mileage is only 34,000

I was thinking of trying to do learns when I service the van in a month or so but don't want to give myself a problem. There are no DTC's in any system and the old adage 'if it ain't broke, don't fix it' lurks in the back of my mind alongside the other cobwebbs

[knobby1]

Hi Dan,

Is that the same for Mk6? Forscan says mine is a 2005 model year (although registered in 2006) 2.4 TDCI 135bhp RWD

Van runs very well, and since blanking the EGR there is no visible smoke from the exhaust. Only slightly annoying issue is a bit of a lumpy idle, although it never feels like it might stall, just has a tiny miss which stops as soon as any throttle applied (even by 50rpm). Mileage is only 34,000

I was thinking of trying to do learns when I service the van in a month or so but don't want to give myself a problem. There are no DTC's in any system and the old adage 'if it ain't broke, don't fix it' lurks in the back of my mind alongside the other cobwebbs

No learns for the Mk6 TDCi Delphi system.... it's a completely different animal to the Euro-4 Mk7 TDCi Denso system....not even close unfortunately, nothing is interchangeable.

Lord Knobrot

[vansit1]

what does the Prv open thing show/tell to the car?

[Coley3159]

Yes, certainly worth doing.its a service procedure which many neglect.

To confirm is yours euro 4 ? Else its non applicable.

Yes it should help smooth things out, however if your scv is not healthy it may still require replacing anyhow. Some even clean them out, but genuine Denso valves can be had for 60 bob. Watch out for fakes !

Its a good starting point running the learns however.

Clutch in can make them hunt. Fairly normal.

Other than that it would suggest fuel pressure may be a little out due to scv often.

Go on to the service functions on forscan, it will run you through the process, reset prv open duration, fuel pump learn followed by injector pilot learn. All simple to follow .

Tbh as long as the van starts and drives id be surprised if it caused any issues with it failing, they sometimes fail due to fuel temps, id recommend doing on a cold engine and bring it up as your doing it.

Cheers

The van is a Euro 4 so all your information is really helpful. If I wanted to check the health of the SCV before I did the learns would I need to look at the live data for the fuel pressure at the common rail? Can I check any other values?

[vansit1]

always best to take all the base values for Maf, Map and Egr with rpm, so you can compare that to any future issues/fixes

[DanMK7uk]

Yes mate, live data get up fuel pressure actual and desired.

You want 230 bar at idle + / - 10%.

If its oscillating erratically with hunting then thats the scv most usually.

Cheers

[Coley3159]

Yes mate, live data get up fuel pressure actual and desired.

You want 230 bar at idle + / - 10%.

If its oscillating erratically with hunting then thats the scv most usually.

Cheers

Perfect I will check those values first and then decide whether to do the learns. If it's erratic I will look into changing the SCV before attempting. I had a week away in Cornwall recently and the van preformed well so im not in a major rush to make changes. I am doing another run to Hungary this summer so want the camper to be in the best possible shape.

[DanMK7uk]

No worries mate.

[T350camper]

Thanks for the information, Lord Knobrot. Much appreciated and saves me cocking things up

[Coley3159]

Yes, certainly worth doing.its a service procedure which many neglect.

To confirm is yours euro 4 ? Else its non applicable.

Yes it should help smooth things out, however if your scv is not healthy it may still require replacing anyhow. Some even clean them out, but genuine Denso valves can be had for 60 bob. Watch out for fakes !

Its a good starting point running the learns however.

Clutch in can make them hunt. Fairly normal.

Other than that it would suggest fuel pressure may be a little out due to scv often.

Go on to the service functions on forscan, it will run you through the process, reset prv open duration, fuel pump learn followed by injector pilot learn. All simple to follow .

Tbh as long as the van starts and drives id be surprised if it caused any issues with it failing, they sometimes fail due to fuel temps, id recommend doing on a cold engine and bring it up as your doing it.

Cheers

How come you recommend to do it on a cold engine? Ive read other places that it should be preformed with a warm engine? Is there an advantage to doing it cold?

[knobby1]

what does the Prv open thing show/tell to the car?

The PRV open and duration timers are just that...it tells how many times and for how long the PRV was open.

Lord Knobrot

[vansit1]

probably yes, but what does it matter for and can you read the stored values somewhere then?