by fabes » Sun Dec 25, 2016 5:42 pm
by nrfsnatch » Thu Jan 05, 2017 7:09 pm
by Tony1918 » Fri Jan 06, 2017 1:09 pm
by SueH » Wed Jan 11, 2017 7:46 pm
by Daewar » Wed Jan 11, 2017 9:02 pm
SueH wrote:Hi All
Popped into my local Nissan dealer today to pick up a new wheel nut and were advised that there is an outstanding recall on my vehicle regarding the ECM. I have a Qashqai +2 60 plate 1.5 Tekna Diesel Manual. This comment caught my attention for reasons below - have booked the car in for Monday 16th but am a bit reluctant having come home and googled the ECM recall and reading your thread. I think the problems that a number of you folks are commenting on have already happened to my car and have been sorted with the ECM being taken out and being sent off to and repaired by a company who specialise in this. I am a bit reluctant to take the car in as it is all going so well. I stopped taking my car to the main dealer a couple of years ago due to the age and the fact that we tend to keep our cars for a while and when we get round to selling them they are at an age where buyers probably wont be too worried about main dealer full history and I have a fantastic mechanic who is far more reasonable and who I trust more than I am sorry to say a main dealer. I do feel though that perhaps I should be contacting Nissan regarding the money I have spent out sorting this problem as it does seem to be a recognised problem? I am copying you in on a long report my mechanic sent me concerning my car in June 2016:
Vehicle : Nissan Qashqai
Customer complaint : Vehicle losing power, lost all power and had to be
recovered home, now starts and cuts out with no power under load.
Cause/Diagnosis : Scanned all fault memories with diagnostic computer, found
various faults including blocked DPF, DPF regeneration failed, DPF pressure
sensor fault, turbine upstream temperature sensor fault, EGR valve fault,
turbine upstream pressure sensor circuit fault, cruise controller implausible
values, pre-heating unit fault, clutch switch fault.
Erased all fault memories and reset then re-scanned fault memory, most faults
were redetected by engine ECU and returned instantly. Second scan of fault
Performed visual check for air leaks on engine which could cause some of the
faults – found split hose between intercooler and throttle body, taped up as a
temporary repair to eliminate part from diagnosis – taped up air tight and found
no change in symptoms so eliminated, however only a temporary repair with tape
so pipe will need to be replaced.
Investigated faults in memory each in turn:
DTC047129 - Turbine upstream pressure sensor circuit – tested upstream
pressure sensor by checking supply voltage to sensor, earth return circuit from
sensor and signal from sensor- all ok
DTC200292 - Particle filter – Clogged – checked soot content in filter via
measured value blocks in engine ecu, soot content 60g so excessive, attempted
forced regeneration 3 times but failed each time before it started due to
DTC054416 - Turbine upstream temperature sensor circuit - tested upstream
temperature sensor by checking supply voltage to sensor - ok, earth return
circuit from sensor – ok and signal from sensor – sensor giving false reading of
constant 100 degrees regardless of temperature and constant -110volt signal,
removed sensor and isolated from circuit to test component by measuring
resistance of sensor whilst applying heat, resistance did not change therefore
sensor faulty and requires replacement. Assume this is the cause for DPF
regeneration failing since for the DPF to regenerate it needs to monitor
temperature in exhaust for safety reasons to ensure it doesn’t go over 500
Replaced turbine upstream temperature sensor and retest, now correct signal is
being produced, attempted regeneration of diesel particulate filter and this
time re-generation commenced and was aborted at 50%. Performed second attempt at
regeneration but again failed at approx 48%. Since now that temperature sensor
fault has been rectified all fault codes now point towards DPF itself being
Removed DPF to replace and found that DPF itself was not faulty but still
heavily clogged with soot, manually cleaned DPF to remove all soot and
re-fitted. Vehicle started and ran but very rough and was over fuelling
excessively. Due to excessive overfuelling the DPF soon became clogged with
hydrocarbons from the unburnt fuel. Removed DPF again, cleaned DPF manually and
continue with Diagnosis to find cause of overfuelling.
Checked fuel pressure at delivery to engine – all ok
Checked Injectors by performing leak off test and by checking fuel pressure at
injectors – all ok
Checked wiring between DPF/exhaust related sensors and engine ECU for continuity
– all ok, checked for possible short circuit to positive – all ok and possible
short circuit to negative – all ok.
Assume fault lies in Engine ECU.
Received quote from Nissan to replace Engine ECU approx 2200.00 +vat to replace
so to be absolutely sure called in a Nissan specialist to confirm diagnosis.
Nissan specialist suggested common fault on Nissan Qashqai 1.5 of cam timing
slipping due to faulty tensioner, stripped apart engine to check cam and crank
timing – found all ok so Nissan specialist confirmed my diagnosis of engine ECU
having eliminated the one possibility I missed.
Remove Engine ECU and sent off for repair, received ECU back after repair,
re-fitted to vehicle, refitted DPF and test – all ok now
Re-scan fault memory and no faults logged. Carried out road test to check DPF
now self cleaning as it should – all ok
Summary of fault : Engine ECU failed internally causing engine to over-fuel.
Over-fuelling caused un-burnt fuel particles to be expelled into the exhaust
system causing the DPF to clog up excessively beyond the point where it could
regenerate itself passively blocked dpf caused complete loss of power as engine
couldn’t breathe. Multiple failed regeneration attempts caused the exhaust
system to overheat to the point where the temperature sensor became damaged.
Am I right that the problem I had with my Nissan is a recognised one? Apologies but I am not very familiar with engines/terminology etc! My mechanic sorted this out for £700 (capping the hours he spent on the EMC sending him on a wide goose chase from 18 down to 6) inclusive of the cost of sending the ECM away to be repaired. Am concerned that someone else having done the repairs may effect warranty though/also very concerned that Nissan touching the car could cause problems - perhaps having the ECM sent off and repaired sorted out the problem so no need for update? As you can tell I am confused.....
Also i was totally unaware that there was a recall - I need to ask the dealer when this was received by them - no notification from them or Nissan direct but assume that they don't have to?
Any ideas please?!
by Jsk » Thu Jan 12, 2017 6:20 am
by SueH » Thu Jan 12, 2017 9:41 am
by steve 46 » Thu Jan 12, 2017 2:48 pm
by Tony1918 » Thu Jan 12, 2017 5:02 pm
by steve 46 » Thu Jan 12, 2017 5:12 pm