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I realize now I've got the "short to ground" wrong. It's possible I've gotten it mixed up with all my googling about this issue. It's shorting to positive.
Because a 714 code is usually a voltage issue then I see you're charging above 14.7v which is too high and will trigger faults. You want it to be no higher than 14.5v but it can get to 14.7v in some occasions. Once you're above 14.7v it's too much for the system and it has to send it somewhere hence the errors. Change that regulator to get the voltage back under control.
because a 714 code is usually a voltage issue then i see you're charging above 14.7v which is too high and will trigger faults. You want it to be no higher than 14.5v but it can get to 14.7v in some occasions. Once you're above 14.7v it's too much for the system and it has to send it somewhere hence the errors. change that regulator to get the voltage back under control.
Thanks for the ideas guys. Wont rule this out as a possible cause.
However, 14.9v seems to be within spec according to INPA and ISTA. This is also the value when idling after a cold start (I live right by the arctic circle, and spring hasn't quite arrived here yet.) It's below freezing, so I reckon 14.9v is fine at startup?
Checking the fault codes, the voltage is between 14.1 and 14.3 when the error occurs.
Tuner just took the car for a drive to the town over with a bunch of kick downs. No faults at all.
Asked him to do another couple of tests from standing still, or from a slow roll, and then he got a fault code and CEL for the air mass sensor (which is the only thing I've seen which has been close to out of spec while reading live data).
Could it be that the air mass sensor "spikes" and sends in too much fuel, which in turn overflows the HPFP from the fuel return?
Tuner took the car for another couple of drives yesterday before I picked it up. Zero faults aside from the MAF error.
I took the MAF out to clean it and reset adaptations (changed the air filter right before the stage 2 tune about a month ago, so I didn't replace the filter again).
The values are still showing up as pretty high, but I also saw that it might take a couple of drives before the values show up as correct? If not, I'm just gonna replace the MAF and see if that helps.
I'm not sure if I'm just happy the car is running, but it seems to have improved the fuel consumption. Checked it on an interstate where I usually get 0.7L -> 0.8L / 10km and now I was getting low 0.6L / 10km's. Will report back if the issue returns, or if it seems to have been solved.
Photo attached of the slightly better MAF "actual air mass" values.
Car is still running fine. Wondering if perhaps these "actual air mass" values on the NOMINAL/ACTUAL values 1 could be the O2 sensor on the (emptied) DPF and not the MAF?
I found these "analog values 1" and saw the "air mass" was at a healthy 84 kg/h. Could this be the MAF values instead? No more MAF fault codes after cleaning it and reseting adaptations anyway.
04-20-2024, 07:49 AM
