Need To Diagnose CAN Network Problem/Solved!

[CapeX5]

Originally Posted by Clavurion

Those CAN-bus codes don't explain why you can't connect DME with diagnostics. Diagnostics is directly from OBD connector pin 7 to DME (TXD2). So I assume you can connect all other modules with diagnostics? Have you checked that diagnostic line from OBD? (If you can connect with EGS that diagnostic line is OK upto E-box) Also check voltage supply and ground to DME along with DME relay.

Thanks Clav, this is some good info. I was just working on it. I have looked everywhere for alternate fuses/locations. I think I have them all and all fuses are good. I seem to be able to comm with EGS. And I have it with EWS. Keys/rolling code/starter enabled/no codes stored. I have looked for the DME relay and I can't find it. I am not getting communication with the IKE/cluster. There seems to be a connection with DME/IKE(instrument cluster). I am now looking at the IVM module. All fuses are good there. But the starter relay is in that apparently. But, still feel like I need to comm with the DME before I start to replace parts-i.e. IVM module. I disconnected the ABS plug from the pump trying to isolate modules on the CAN buss.

[Clavurion]

Originally Posted by CapeX5

I have looked everywhere for alternate fuses/locations. I think I have them all and all fuses are good. I seem to be able to comm with EGS. And I have it with EWS. Keys/rolling code/starter enabled/no codes stored. I have looked for the DME relay and I can't find it. I am not getting communication with the IKE/cluster. There seems to be a connection with DME/IKE(instrument cluster). I am now looking at the IVM module. All fuses are good there. But the starter relay is in that apparently. But, still feel like I need to comm with the DME before I start to replace parts-i.e. IVM module. I disconnected the ABS plug from the pump trying to isolate modules on the CAN buss.

But those CAN codes on your previous picture were from instrument cluster (IKE). So what you mean you can't connect with cluster? Diagnostics to all other modules (including EWS) except DME and EGS go via OBD pin 8 and instrument cluster working as a gateway to K-bus.

If you have DSC (not ASC) then steering angle sensor is one typical cause for CAN-bus problems.

I assumed we are talking about M62 with ME7.2, not N62 with ME9? Isn't IVM only on newer ME9? Here should be the supply diagram for ME7.2.

https://www.newtis.info/tisv2/a/en/e...supply/ood0g4V

[CapeX5]

Originally Posted by Clavurion

But those CAN codes on your previous picture were from instrument cluster (IKE). So what you mean you can't connect with cluster? Diagnostics to all other modules (including EWS) except DME and EGS go via OBD pin 8 and instrument cluster working as a gateway to K-bus.

If you have DSC (not ASC) then steering angle sensor is one typical cause for CAN-bus problems.

I assumed we are talking about M62 with ME7.2, not N62 with ME9? Isn't IVM only on newer ME9? Here should be the supply diagram for ME7.2.

https://www.newtis.info/tisv2/a/en/e...supply/ood0g4V

Clav, Man, I wish you were closer to me, you definitely have a true understanding of this! Thank you. I am sure my comments about connecting with IKE were incorrect as far as how I worded that. It just seems that all my msg's on my Foxwell are IKE related. That is what I was referencing. Yes we are working with an 04 N62 motor. And it has an IVM. I was just in the DME box inside the engine compartment and there is not that extra fuse box that others reference. As far as module accesibity, I can not access the SAS, which I thought was odd. I would think that with the appropriate program I could get closer to diagnosing where the issue is specifically. Until your response, I was going to try and disconnect the misc modules on the CAN buss and see if things cleared up. But with your information, it sounds like I should be checking the individual pins in the DME and OBD plug to verify power and grounds. Kind of old school, but makes sense to me.

[CapeX5]

Clav, Should I pursue this schematic? You can see the IVM is integral to the starter operating.
https://www.newtis.info/tisv2/a/en/e...-motor/reoNfal

[Clavurion]

Could you please give the exact specs of the actual vehicle and installed donor engine so we are on the same page.

[CapeX5]

Originally Posted by Clavurion

Could you please give the exact specs of the actual vehicle and installed donor engine so we are on the same page.

It is a 2004 E53 with a N62 engine. As far as software, I do not know enough to spec that. The replacement engine came out of a 04 745. All electrical hookups matched up fine with existing wiring harness.

[Clavurion]

Originally Posted by CapeX5

It is a 2004 E53 with a N62 engine. As far as software, I do not know enough to spec that. The replacement engine came out of a 04 745. All electrical hookups matched up fine with existing wiring harness.

OK. Then it's ME9 (DME) and you have IVM.

https://www.newtis.info/tisv2/a/en/e...supply/fqnr3j0

https://www.newtis.info/tisv2/a/en/e...a-line/nqsAhVl

[CapeX5]

Originally Posted by Clavurion

OK. Then it's ME9 (DME) and you have IVM.

https://www.newtis.info/tisv2/a/en/e...supply/fqnr3j0

https://www.newtis.info/tisv2/a/en/e...a-line/nqsAhVl

So, basically follow these schematics to check functions and report back?
One interesting note, is that the check engine light does not come on. I know it works because in INPA I do a "function check" and it does illuminate. A video on YT with a E46 with same symptoms had same issue. He had some different issues, but the light not coming on was a DME problem.

[Clavurion]

Originally Posted by CapeX5

So, basically follow these schematics to check functions and report back?
One interesting note, is that the check engine light does not come on. I know it works because in INPA I do a "function check" and it does illuminate. A video on YT with a E46 with same symptoms had same issue. He had some different issues, but the light not coming on was a DME problem.

Well yes. Like said earlier check that DME has those voltages and grounds and for diagnostics that line from OBD to DME is OK.

IIRC when cluster has no CAN-bus connection to DME the check engine light won't light up and the coolant temp gauge will go to max temp.

[CapeX5]

OK, for those of you bored beyond tears with this thread-here is an update! Finally some progress, I think. With Clavurion help, I have studied the schematics till my eyes hurt. I have pulled the IVM and checked all connections there in prep for checking voltage/continuity. Upon removing, I have corrosion on 2 different connectors and one pin missing. It is pin 14 on the the X60094 connector that is missing. I can not find the actual schematic of where that wire goes. But as you can see, others are corroded and who knows what else. So, I have ordered another IVM....