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The Bentley lists it as the main engine harness connector, but I haven't found it on the wiring diagram because I can't find a connector number for it.
Is it the junction where all the purple wires are going into in this image? I don't see a connector number for it either.
This schematic shows the BLUE wire from the oil pressure sender (which is where I think the oil traveled from into the cylindrical connector), but the line goes directly to X11177. I don't really see the cylindrical connector there. Maybe I'm looking at the wrong thing?
Well, I thoroughly cleaned the oil out of the cylindrical mystery connector with brake fluid and reconnected the battery but it didn’t seem to make any difference. Errors still there and won’t clear.
I'm still not entirely sure what to make of the wiring diagrams without tracing things through physical harnesses.
Do you have fewer codes than you had before, or did you just not take photos of everything? I thought I remembered some kombi stuff from before. Oh, is that because you didn't start the car?
I'm still not entirely sure what to make of the wiring diagrams without tracing things through physical harnesses.
Do you have fewer codes than you had before, or did you just not take photos of everything? I thought I remembered some kombi stuff from before. Oh, is that because you didn't start the car?
Good catch. I may have tested with tach disconnected or taken photos after temporarily being able to erase codes.
Here is current status with tach plugged in and not attempting to clear anything.
Checking pins 6 and 14 on OBD breakout box is showing an open circuit I think. Because if i remove the OBD cable emoter reads 46K Ohms just across the breakout box.
Traced the CAN Hi and CAN Low pins on the tach connector over to R21 which is unpopulated. R21 would put a resistor perfectly in parallel with CAN Hi and CAN Low.
It doesn’t appear like anything broke off of the R21 pads though.
You've safely moved well beyond my troubleshooting knowledge of OBD and CAN, which was already pretty minimal to start with . I don't know if any of my documents have info on that resistor or not. I'll see if I can dig up something.
I agree that it looks like R21 was never populated. The solder looks too clean to me. However... what's up with that big surface mount electrolytic - the 220 µF 35 V one? Has it vented, or am I just seeing the casting in the top of the case? I assume I'm just seeing things and that it's probably fine.
Okay, if I'm understanding the bus system document correctly, I interpret it as there being a resistor in the cluster where the speedo is (IKE, right?), since the document has the tach labeled as the "remote instrument pack."
Oh, and I think that's a Nichicon cap. Those should be quite good.
Wait, so you could be seeing the resistor in either the IKE or the DME, right? It says the CAN bus is a parallel circuit, with 120 Ohm resistors in those two modules (DME and IKE) and basically Hi-Z in all the others (10 KOhms to 50 kOhms), so the tach I think is showing fine in that respect? That is, if you assume the resistor is in the speedo and not the tach.
But if you're seeing 100 Ohms instead of 60 or 120... something's not right, I would think. I mean, we know something isn't right, but would there really be that much extra resistance just on the bus wires? That Fluke should be reading dead on, so it shouldn't be the meter.
Last edited by deepgrey; Apr 22, 2023 at 04:37 PM.
Reason: more thoughts, but not another post
Wait, so you could be seeing the resistor in either the IKE or the DME, right? It says the CAN bus is a parallel circuit, with 120 Ohm resistors in those two modules (DME and IKE) and basically Hi-Z in all the others (10 KOhms to 50 kOhms), so the tach I think is showing fine in that respect? That is, if you assume the resistor is in the speedo and not the tach.
But if you're seeing 100 Ohms instead of 60 or 120... something's not right, I would think. I mean, we know something isn't right, but would there really be that much extra resistance just on the bus wires? That Fluke should be reading dead on, so it shouldn't be the meter.
Yes, I would think the added resistance would bump it up over 120 Ohms. 100 seems a bit low but it’s the only near correct thing I’ve been able to find.
You've safely moved well beyond my troubleshooting knowledge of OBD and CAN, which was already pretty minimal to start with . I don't know if any of my documents have info on that resistor or not. I'll see if I can dig up something.
I agree that it looks like R21 was never populated. The solder looks too clean to me. However... what's up with that big surface mount electrolytic - the 220 µF 35 V one? Has it vented, or am I just seeing the casting in the top of the case? I assume I'm just seeing things and that it's probably fine.
I did‘t think the cap looked too bad. Here’s some more pics.
Wait, so you could be seeing the resistor in either the IKE or the DME, right? It says the CAN bus is a parallel circuit, with 120 Ohm resistors in those two modules (DME and IKE) and basically Hi-Z in all the others (10 KOhms to 50 kOhms), so the tach I think is showing fine in that respect? That is, if you assume the resistor is in the speedo and not the tach.
But if you're seeing 100 Ohms instead of 60 or 120... something's not right, I would think. I mean, we know something isn't right, but would there really be that much extra resistance just on the bus wires? That Fluke should be reading dead on, so it shouldn't be the meter.
I think the parallel 120 Ohm resistor in IKE and DME which should measure across Hi and Low at 60 Ohm.
If one resistor is out then Hi to Low should measure 120.
. I don't know if any of my documents have info on that resistor or not. I'll see if I can dig up something.
