Diesel Engine Experts ? Nissan Navara

[blackolive (Ste)]

got a bit of a problem with my Navara. 2003, 2.5 TD25Dtti engine https://en.wikipedia.org/wiki/Nissan_YD_engine#YD25DDTi_(VP44_Pump)

Its taken to intermittently cutting out, It can go for days or a week or so without happening then its back with a vengeance.

when it happens its throwing up fault code 0073 pump communication line , which is suggesting a CANBUS error between the ECU and fuel pump control module ( Bosch VP44 pump ).

now the majority of google suggestions, and the Diesel place near us are suggesting the electronic module on the pump is at fault and it needs a new pump. the main fault with this module seems to be the power transistors that control the timing solenoid and/or metering solenoid have failed.

Now if the cutting out was completely random or the truck had completely died I could go with this BUT when it does cut out , without fail its as I hit 2000 RPM on a light throttle opening, and it always picks its feet back up again after a second or so.

It feels very similar to when the neutral position switch on the gearbox starts failing and it goes into limp mode when accelerating, but Ive fitted a new switch a bit ago, and Ive checked that this one is ok.

This is leading me to think that its something else happening, maybe something isnt sensing its coming on boost or similar ?

Im not really up for forking out for a new pump if its not going to fix the problem.

I had wondered if there are any diagnostic facilities that can be plugged into the OBD port that will analyse whats going on in real time whilst its happening ?

I know there are some really clued up people on here, has anyone got any ideas ?

 

[Dcal]

I don't have any experience of the Navara (or Nissan) but the Fiat Multieuscan and VAG software will give you live data of all the modules and can normally show up faults. They also usually give you pointers within the software of what to check and what the readings should look like.
Its always worth checking the wiring and earth points but you need a good workshop manual or the manufactures fault finding procedures to have much hope of sorting it.

Another great tool for this sort of problem is the Picoscope range of PC Oscilliscopes which are great a capturing the output from faulty modules.
There is plenty of help on their website and it might be worth a look on there for similar issues. They also have a library of wave forms, from good and faulty modules.
You don't need the full auto version (great if you can get access to it though) I've got an early two channel version and it has got me out of hole a few times.

Sorry I can't be anymore help, hopefully someone with knowledge of the fault will be along soon.

 

[hotponyshoes]

You might be able to view the fuel rail pressure (If it has a sensor for that?) and see if it drops off when he problem occurs?
I think that year is indirect injection though so might need a manual gauge?

Can you reproduce the problem when parked out of gear or only when driving?

 

[8ob]

If its the older non common rail version you can take the top of the pump off in situ and send off the ecm for repair. If you need the locking tool to remove the pump without losing the timing chain let me know, I made one up.

Bob

 

[Barking Mat]

VP44 injection pump, this is, is it not, the famous injection pump which after years of getting hot eventually the pcb dies in the pump. As fitted to a wide range of vehicles, including certain tdi's and most GM engined vauxhalls. Recon' injection pump time. Usually in my experience they just die.

 

[blackolive (Ste)]

thanks all. from What Ive read they can only repair the ECM if its the output transistors.

Ive a couple of days off next week so its in to the diesel place for them to have a look, Id discussed how there is a pattern to it cutting out and he thinks that its a possibility something else is out of kilter and triggering fuel cut. He did say that everything will be checked before resorting to a new pump so we'll see.

 

[weldingnovice]

Have a look around on the transit forum lots of info on there regards this pump.

https://fordtransit.org/forum/index.php?sid=2d0f366a48a4dd46d0a857b8a67ca320

 

[addjunkie]

Go on facebook there is a nissan navara technical group, some very good advice to be had there.

 

[8ob]

Ask me why I hate Navaras

 

[addjunkie]

Ask me why I hate Navaras

But at least you get to weld up the chassis, when it fails

 

[8ob]

But at least you get to weld up the chassis, when it fails

The chassis is the only good thing about it

 

[blackolive (Ste)]

Ask me why I hate Navaras

OH.. Engine gone bang ? Mines had the Billcar mod done.

Also it hasnt cut out for 3 days again, Its going to be like taking a telly with an intermittent fault to the menders

 

[blackolive (Ste)]

had it in to the garage for 2 days last week. they checked the peripheral sensors which were all ok, couldnt reproduce the fault, but confirmed that it probably isnt the pump, and it would be expensive futility at this stage to fit a new one. So Ill just keep driving it.