S40 diesel problems - Page 2

madmarf · Oct 11th, 2012, 20:38

Quote:

Originally Posted by gatos

Only other thing I can think off is the fuel pressure regulator, located on the high pressure fuel pump.

yer we thought that aswell. we replaced the pump so would have thought it would have fixed it. we also stripped down the old one and that appeared to be working fine aswell.

gatos · Oct 11th, 2012, 20:56

Damn it. Then I am going back to the ECU theory..........

Darlo 1 · Oct 11th, 2012, 23:41

Sensor on the fuel rail itself?

Biotoxic · Oct 12th, 2012, 08:53

Check if there is a fuel coming from fuel return pipe/s when you are crancking the engine, If there isn't any then it is likely that a camshaft sensor is gone thus not supplying a diesel to the injectors. If it is ok then unplug the fuel pressure sensor, boost pressure sensor, EGR cable, camshaft sensor it should display an error on the dashboard, if not then there is a problem with ecu or the cables going to and from ecu, most likely the wiring loom under the radiator...

littlehomer · Oct 12th, 2012, 10:03

There's a wiring loom that runs from behind one of the wheel arches, behind the headlamp and then down under the radiator. It is prone to water saturation and the wires can corrode and insulation split etc. It can lead to some funky electrical problems. There's a guide to repairing it on here somewhere.

madmarf · Oct 12th, 2012, 19:06

ok guys, thanks, i will try and look at the loom tomorow and will get back to you.

madmarf · Oct 13th, 2012, 16:37

ok so i stripped the radiator loom to find it in perfect working order. all tested from end to end ok. i checked the cam sensor to be sure and fuel does flow out of the return on the HP pump. i think were edging towards the ecu. can anyone tell me if i get a replacement ecu, will DICE be able to reprogramme it? do i need any codes etc... ive just ordered a dice today. also to be sure as theres so many, which location is the ecu in?

gatos · Oct 13th, 2012, 18:11

You are lucky as the ECU is not a lot easily accessible on the 1.9D than the petrol version. I have highlighted it with the yellow oval shaped circle.

If you change the ECU, then you will have to program the keys to the system and only volvo can do that for you. DICE will not be able to do it for you.

Another option is to get a complete lockset which includes the ECU, the immobiliser and the corresponding key. In case you have the flip key which has the fob incorporated within the key, you will also need to get the locking alarm unit. This way, you will not need any programming at all.

I have a complete lockset with two keys and I will be swapping it on my 1.9D to see if it works. If it does, then I will be replacing it on my car and will have a spare complete lockset with one key

madmarf · Oct 13th, 2012, 18:31

ah, ok, yer i thought that was the main ecu. do you know why it isnt possible to reprogramme a new ecu? why its volvo only and dice cant do it?

gatos · Oct 13th, 2012, 20:15

They need to download the right software for that. Programming the old keys with the replacement ECU is meant to be a security/safety thing. Also, not 100% sure but I think the immobiliser unit must also be programmed with the ECU

Oct 11th, 2012, 20:56	#12
gatos Premier Member Last Online: Nov 15th, 2022 21:34 Join Date: Apr 2010 Location: London / Essex	Damn it. Then I am going back to the ECU theory.......... __________________ Current car: 2002 S40 1.9D, 1992 240SE Nullius in Verba

Oct 11th, 2012, 23:41	#13
Darlo 1 Lunatic. Last Online: Today 15:28 Join Date: Dec 2006 Location: staffordshire	Sensor on the fuel rail itself? __________________ V40 1.9D 2004 620 miles to the tankful. 235000 miles on clock. Now sold, S60 D5 2004. I vape therefore I am.

Oct 12th, 2012, 08:53	#14
Biotoxic Master Member Last Online: Dec 30th, 2018 08:33 Join Date: Oct 2010 Location: Craigavon area	Check if there is a fuel coming from fuel return pipe/s when you are crancking the engine, If there isn't any then it is likely that a camshaft sensor is gone thus not supplying a diesel to the injectors. If it is ok then unplug the fuel pressure sensor, boost pressure sensor, EGR cable, camshaft sensor it should display an error on the dashboard, if not then there is a problem with ecu or the cables going to and from ecu, most likely the wiring loom under the radiator... __________________ Useful threads and information Guide: How to change/adjust timing belt Guide: Fitting LED's This is how S40 1.9 TD engine components looks like Information regarding EGR, problems and solutions A.K.A. Hesitation, sluggishness etc.

Oct 12th, 2012, 10:03	#15
littlehomer Master Member Last Online: Jul 15th, 2013 11:29 Join Date: Mar 2010 Location: Malvern View Photos By: littlehomer	There's a wiring loom that runs from behind one of the wheel arches, behind the headlamp and then down under the radiator. It is prone to water saturation and the wires can corrode and insulation split etc. It can lead to some funky electrical problems. There's a guide to repairing it on here somewhere. __________________

Oct 13th, 2012, 20:15	#20
gatos Premier Member Last Online: Nov 15th, 2022 21:34 Join Date: Apr 2010 Location: London / Essex	They need to download the right software for that. Programming the old keys with the replacement ECU is meant to be a security/safety thing. Also, not 100% sure but I think the immobiliser unit must also be programmed with the ECU __________________ Current car: 2002 S40 1.9D, 1992 240SE Nullius in Verba

Oct 12th, 2012, 19:06	#16
madmarf New Member Last Online: Nov 17th, 2012 17:39 Join Date: Mar 2010 Location: brighton	ok guys, thanks, i will try and look at the loom tomorow and will get back to you.

Oct 13th, 2012, 16:37	#17
madmarf New Member Last Online: Nov 17th, 2012 17:39 Join Date: Mar 2010 Location: brighton	ok so i stripped the radiator loom to find it in perfect working order. all tested from end to end ok. i checked the cam sensor to be sure and fuel does flow out of the return on the HP pump. i think were edging towards the ecu. can anyone tell me if i get a replacement ecu, will DICE be able to reprogramme it? do i need any codes etc... ive just ordered a dice today. also to be sure as theres so many, which location is the ecu in?

Oct 13th, 2012, 18:31	#19
madmarf New Member Last Online: Nov 17th, 2012 17:39 Join Date: Mar 2010 Location: brighton	ah, ok, yer i thought that was the main ecu. do you know why it isnt possible to reprogramme a new ecu? why its volvo only and dice cant do it?

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