Hello everyone,
I have a
Cayman 987.2
that intermittently displays “Oil Pressure Sensor default” warning.
Piwis
only shows me the P0521 default code.
The Oil pressure sensor was replaced, as was the connector. The continuity of the wiring was also checked, but it is possible that this only occur when the engine is hot or vibrating.
As part of my investigation into this intermittent “oil pressure sensor default,” I read on a
Porsche
forum for another model that electrical connection
points
can sometimes come loose. I’d like to check the tightness of the ground connection point SP084_SPKL31SENS_987 Y084, which is shared by the oil pressure sensor, the knock sensors, the coolant temperature sensor, and the engine compartment temperature sensor (see wiring diagram). Does anyone know where this connection point is located? I traced the wires from the sensors, but at some point they disappear into the common wiring harness (which runs through part 3, the “carter cable wire guide”), and I can’t see where they go from there or where this connection point might be... On the
DME
side, there’s only one ground input (or rather, output in this case) (terminal C17). Looking at the diagram of the rear wiring harness on the car, I don’t see how to access the section I’ve highlighted in yellow, because I’m wondering if the connection point might be over there…
If anyone has any ideas, I’d love to hear them!
Thanks in advance for your help.
Hey
@Nexty9
, chasing down an intermittent electrical gremlin like that P0521 code sounds super frustrating. It's smart to check that shared SP084 ground point after you've already replaced the sensor and connector. Have you been able to snap any photos of where the harness disappears or the part of the diagram that's tripping you up? Sharing those visuals might help someone here recognize the location.
Good idea on the photos—that would definitely help narrow it down. In my experience with these, the issue is often in the harness before you ever get to a physical “connection point” that you can easily access. The wiring can look perfect but still open up internally when hot or under vibration
Hello,
Thank you for your reply.
I'll try to take some photos this weekend.
Meanwhile, I found a diagram of the engine wiring harness: it shows two “starter terminal controls,” one labeled 30 and the other 50. I'm thinking one of these two “terminal controls” might contain the Y084 ground connection I'm looking for... They both appear to be on the right side of the engine, which also matches the area of the wiring harness I’m looking for… Attached are photos of the diagrams in question.
Hello,
Thanks for you reply.
You're right, I also need to test it with the engine warm, since vibrations and heat can cause intermittent issues that don't show up when the engine is cold...
Hello,
First pic is the oil pressure sensor.
The sensor cables run along the intake air distributor in the engine wire harness.
They are connected to other cables from right part of the engine, including right knock sensor, engine compartment temperature sensor which they share a ground connection according to the electrical diagram: on the second pic, but i don’t see any box where this ground connection could be made.
Then they pass through the engine compartment to the trunk through a rubber sleeve (third pic). There is only one regulated ground connected to the
DME
.
if anyone has a y ideas, I ´d love to hear them!
But why does my second photo appear as “sensitive content”?
I know my
Cayman
is sexy, but well. . .
In any case, you can view the photo by clicking on it...
I'm not sure it's the same on a
987.2
, but on a
987.1
that common sensor ground wire goes to a pin on the
ECU
labeled SENSORS GND (pin 18 on connector C). Perhaps somebody with
987.2
schematics can verify?
Hello,
Thank you for your feedback. Yes, you’re right—there’s only one input on the
DME
(C17, I believe, for a
Cayman 987.2
). But since there’s only one cable going into the
DME
, and that ground is used by several sensors, there must be a connection point or distribution point for that ground to the sensors—that’s what I’m looking for...
