ECU or fuel injectors? s40 v50 2.0 diesel

volvoowneruk · Aug 3rd, 2014, 22:33

Hi people, once again, got ECU checked by repair company for my s40 v50 diesel 2.0 who said it is fine no errors. put back into car along with a new injector and now no pulse signal to injector 1 and 4 (4 being the one that was said to be faulty and replaced), injectors 2 and 3 according to mechanic are getting a signal but not 1 and 4. he has checked the wiring from the ECU harness for continuity using the ohmeter they are fine however using noid lamps there is no signal to injector 1 and 4. the car does start but after a serious struggle. however serious misfire due to 1 and 4 being down.

so mechanic reckons it is a faulty ECU and advised it should be replaced, but it is very expensive to do. he is adamant it cannot be a fault with any other component. any thoughts on this one, I was advised on this forum it could be throttle body needs cleaning or changing fuel filter, but mechanic is saying the electrical issue is not controlled by these components

. this car is seriously stressing me out....please any advise will be greatly appreciated.

why would pulse go only to 2 injectors and not the other 2?

Thanks in advances

brokenbritain · Aug 3rd, 2014, 23:57

You need for certain to be able to check continuity of wiring from Ecu to injectors, do not buy an Ecu until you can prove that it is faulty, if your mechanic cannot sort it get an auto electrician to test it, either that or waste more money on parts that may not be needed, it is quite rare that ecus are faulty, it is normally wiring connections or bad earths etc...

volvoowneruk · Aug 4th, 2014, 09:50

the two injectors which are working the noid lamp is indicating that to be the case, whereas the 2 which are not working the lamp is not lighting. why would 2 injectors not have signal and 2 do, is there a separate controller for each injector on the ecu?

G15gle · Feb 16th, 2018, 19:00

Did you get to the bottom of the problem as I am having the same problem with my v50. I know it was a long time ago but any help would be appreciated.

volvo for ever · Feb 17th, 2018, 20:22

can i ask lookingat ecu unit is it covered in white fluff corrosion if so replace ecu

Aug 3rd, 2014, 22:33	#1
volvoowneruk New Member Last Online: Oct 6th, 2014 18:17 Join Date: Jul 2014 Location: Yorkshire	ECU or fuel injectors? s40 v50 2.0 diesel Hi people, once again, got ECU checked by repair company for my s40 v50 diesel 2.0 who said it is fine no errors. put back into car along with a new injector and now no pulse signal to injector 1 and 4 (4 being the one that was said to be faulty and replaced), injectors 2 and 3 according to mechanic are getting a signal but not 1 and 4. he has checked the wiring from the ECU harness for continuity using the ohmeter they are fine however using noid lamps there is no signal to injector 1 and 4. the car does start but after a serious struggle. however serious misfire due to 1 and 4 being down. so mechanic reckons it is a faulty ECU and advised it should be replaced, but it is very expensive to do. he is adamant it cannot be a fault with any other component. any thoughts on this one, I was advised on this forum it could be throttle body needs cleaning or changing fuel filter, but mechanic is saying the electrical issue is not controlled by these components . this car is seriously stressing me out....please any advise will be greatly appreciated. why would pulse go only to 2 injectors and not the other 2? Thanks in advances

Aug 3rd, 2014, 23:57	#2
brokenbritain Senior Member Last Online: Mar 29th, 2019 01:52 Join Date: Dec 2012 Location: Martock , Somerset TA12 6HB	Ecu or injectors You need for certain to be able to check continuity of wiring from Ecu to injectors, do not buy an Ecu until you can prove that it is faulty, if your mechanic cannot sort it get an auto electrician to test it, either that or waste more money on parts that may not be needed, it is quite rare that ecus are faulty, it is normally wiring connections or bad earths etc...

Feb 16th, 2018, 19:00	#4
G15gle New Member Last Online: May 24th, 2023 19:49 Join Date: Feb 2018 Location: Blackpool	Follow up Did you get to the bottom of the problem as I am having the same problem with my v50. I know it was a long time ago but any help would be appreciated.

Aug 4th, 2014, 09:50	#3
volvoowneruk New Member Last Online: Oct 6th, 2014 18:17 Join Date: Jul 2014 Location: Yorkshire	the two injectors which are working the noid lamp is indicating that to be the case, whereas the 2 which are not working the lamp is not lighting. why would 2 injectors not have signal and 2 do, is there a separate controller for each injector on the ecu?

Feb 17th, 2018, 20:22	#5
volvo for ever Premier Member Last Online: Feb 4th, 2023 15:10 Join Date: Apr 2015 Location: uk	can i ask lookingat ecu unit is it covered in white fluff corrosion if so replace ecu

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