fuel rail pressure sensor "A" circuit performance
Not a hard fault, can take 200km till fault happens. 244209km on clock, some help to track down fault? have changed fuel filter.
DId you by chance save the freeze frame on the code to see when it triggered? And if so can you post it so we can take a look at it?
Are these the same motors as the sprinters? I think They are and if so, have a good hard look at the pressure sensor filter and see if has debris. We had an injection pump fail and wreak havoc in the sytem.
Hi Michael, we do have a freeze frame but having trouble attaching it. Do you know what format it should be in ??
Hi Tony, A graphic file is what we currently support. JPEG or PNG file will work fine. Let me know if you have any trouble.
Great, get it up and let's see if we can figure it out.🙂
hi Hi Michael, did you get the Freeze frame data and any thoughts?
The code triggered with the engine not running. See if in the service info if it gives you a pressure to voltage chart for the sensor and see if it matches for the pressure. If it doesn't check power, ground, signal to the sensor with a scope or dvom and then make sure the signal voltage at the sensor matches with what the computer sees. Do this and let me know what you find.
I agree, lets not get too crazy. Lets start with the basics. Your actual and specified fuel pressure don't match. Do they match while the engine is running? Your code could be caused by low fuel pressure, but it could also be caused by a sensor power/ground issue. Let's start by getting a running capture. idle and under load. lets make sure this low pressure pump can keep up. Second, lets
Hi Michael, thanks for getting back to me, Unfortunately we haven't resolved it. The owner has decided to go and trade the car in as he doesn't want to spend any more money on it [which is understandable]. He appreciated all the effort but it was at the stage where it didn't matter what path we took it was going to cost a lot to sort out. Thanks again for all your help, we've enjoyed "talking"
The code did set at KOEO. However, do you have scan data with it running? It appears the actual pressure is lower than desired from the freeze frame data you submitted. Are there any driveability complaints? Poor performance etc? If not, there could be a chance that the sensor could be inaccurately reporting lower pressure than what's truly in the rail. Circuit tests need to be performed as
I think the first step would be to verify circuit integrity on this test your reference voltage your ground and signal wire and make sure you dont have spread terminals. Once you know your circuit is intact hook up a scope if ones available to the signal circuit and ensure while driving its not dropping out. Is there a lack of power or running issues at all or just the check engine light with
Hey Tony, I would recommend sharing a little more information with us. We can see from the freeze frame data that the code set with the engine off but we don't know if that has always been the case. Do you know if the code set under different conditions? I would of course perform a visual inspection first but my next step would be to set up a scan tool to record your data while test driving
This is an eco diesel vm platform not the Mercedes unit.
It looks like this is a Global Code. If so, can you check for enhanced fault codes. Build the vehicle in the scan tool instead of going into the Global OBD/Generic side of the scan tool.