Nissan Navara 2.5 Denso

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Re: Nissan Navara 2.5 Denso

Postby steevegt » Wed Jul 05, 2017 12:20 am

If you can't replicate the fault, I guess it's not going to be easy...

You can can do other tests, like injectors return flow? You may find something, but you cannot guarantee that it is related to the problem you are trying to solve.

Most likely you don't have ambient data/freeze frame data for the code right? You could use a communication tool with PID logging capabilities, deliver the car to the customer, and ask him to start, and stop the capture!? You need to trust him a little to do that, but it may help to have more information of the conditions that originate the fault.
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Re: Nissan Navara 2.5 Denso

Postby STC » Wed Jul 05, 2017 8:56 pm

I will get the owner to drive it tomorrow, scope on SCV Current, Voltage, FRP & Pump Inlet Pressure. Fifth Channel on his Driving Style.

If we cannot replicate the fault I will send it away until it is repeatable, preferably permanent.
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Re: Nissan Navara 2.5 Denso

Postby RYM6746 » Fri Jul 07, 2017 12:17 am

Have you tried monitoring the rail pressure whilst driving (prefably uphill) say in 2nd gear and wind the rail pressure right up to its maximum and hold it there for as long as possible. It should sustain max pressure. No decay at all. Basically you are loading the engine up and the injectors are held wide open for long periods. I have found numerous blocked fuel filters buy running that test. It's quick and easy and can be done using nothing but a scan tool. I know you have already replaced fuel filter but it may replicate the fault as you are stressing the pre supply system due to it having to be able to "keep up" with the demand from the high pressure side. Simply doing the high pressure tests in the workshop almost never shows this type of fault as you are not really checking the volume only the pressure capabilities. If you get the injectors wide open for long periods it may prove volume is good
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Re: Nissan Navara 2.5 Denso

Postby STC » Sat Jul 08, 2017 2:01 am

WOW - Good Idea Rym.

You are right, in the workshop it is not boosting hence the demand is low by comparison.

I will do that and report back.

Thank you !
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Re: Nissan Navara 2.5 Denso

Postby Technician » Sat Jul 08, 2017 4:34 pm

Rolling road tuner with a big fan in front of radiator to keep it cool while running fast normally saves a lot of problems driving round the roads to find those types of faults, do you not have a local garage with a power rolling road to use?
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Re: Nissan Navara 2.5 Denso

Postby STC » Sun Jul 09, 2017 12:09 am

Rolling road tuner with a big fan in front of radiator to keep it cool


If the fan stops working I can call you ??? ROFL !!


Perhaps you have not thought this through ?
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Re: Nissan Navara 2.5 Denso

Postby Technician » Sun Jul 09, 2017 2:36 am

STC wrote:
Rolling road tuner with a big fan in front of radiator to keep it cool


If the fan stops working I can call you ??? ROFL !!


Perhaps you have not thought this through ?


If, that's a big if. A proper rolling road tuning firm I sure would not put their business in such a position to work with faulty equipment, would they!
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Re: Nissan Navara 2.5 Denso

Postby STC » Sun Jul 09, 2017 8:48 am

Once again we enter waffle / digress territory.

The Alleged fault cannot be replicated on the road. I have loaded up the HP system to 2200 bar - well above what it is likely to be in normal service on the road.

It is time to walk away until such time that it gets worse and can be repeated at will. In its present state, if one was lucky enough to catch the fault and effect a repair then how long would one spend testing that repair ???

For all I know it could be a mystery shopper blowing wind up my shirt.

We can draw line under this for now. No Fault - No Fix
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