Always New Technology
Hey guys I had this 16 Sonata in a few weeks ago for a P0011 Intake cam performance code and a lack of power on accel. I expected to find a VVT oil control solenoid and cam phaser/sprocket just like any other VVT vehicle. However upon investigating this is not the case. I may be way behind and this is old news. However I have seen nothing online about it so ill post anyway. The exhaust cam is controlled via a conventional electric solenoid valve and cam phaser/sprocket. The intake on the other hand is a different story. There is now a large electric motor that is part of the cam phaser/sprocket assembly. It has a positive and negative control wire connected directly too the ECM. I have a 2016 Kia Sorento in my bay right now that has the same engine. Im putting a short block in it for oil consumption so I took some pictures of the intake cam sprocket and motor to give it a visual.
Anyway the diag was pretty simple. A test drive revealed a serious lack of power. Scan data was a little confusing but seemed like the intake cam was not being phased. I scoped the cam and crank signals at idle and they match the known good in the Hyundai SI in Alldata. I have also posted the known good in Resources.
I then connected to the power and ground and put an amp clamp around one of the wires at the ECVVT Motor and went for a test drive. I put a couple screen shots here at various stages of RPM. The high amperage in the green is during heavy accel.
Also I apologize after looking at these waveforms I noticed it looks like I didnt have my amp clamp properly zeroed. However I think you can get the idea. The positive control circuit in blue seems to do most of the work. Sometimes the ground side is pulsed. Im not sure if that is a "brake" of sorts or moving it back to "zero". Any input is welcomed. After clearing the code and a couple hard test drives the problem went away and full power was restored. The ECVVT captures were taken when the car was acting normal. Because the PCM was clearly doing its job and the base timing was good I quoted an Intake Cam Motor/Sprocket assembly and cover. The customer had no money or warranty so they declined for now. I really honestly like this setup. Although oil pressure is still very important it doesnt really play much of a role in this system. Having an all electric motor really simplifies the diagnosis. I am by no means an expert but figured I would share what I gathered. I also attached the Pico files for the motor and cam/crank.
I believe many Euro vehicles operate the same way. Good info. Thanks for sharing.
Caleb, you are correct, it's a Bi-Directional DC motor. That is a "performance" code. Cam Crank phasing is out by x amount of deg. or taking too long to respond. Next time check the brush assembly for oil and the slip rings for scarring.
It does look like the inner slip ring has built up debris from the brush where as the outer looks much cleaner. This may be perfectly normal, but odd that there is a distinct difference.
There is a recall for replacing the plug in the CVVT unit. If it has already come out and oil is in the cover, it gets replaced also. There are situations if the CVVT contact area is chewed up like yours appears to be, that also gets replaced. I would send it to the dealer for this issue.
Thanks Ty. The pics I posted are not from this car. I never disassembled anything on the Hyundai and as I said in the post the customer declined any repairs. The pics are from a 16 Sorento I happened to be doing a short block in at the time. But thanks for the info. Unfortunately this customer is long gone.