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Title: Med9 passat 3.6 bws no communication Post by: tahz on January 11, 2023, 12:33:16 PM Good day
I have done a swop into my mk4 with a 3.6 bws I have used kess and done an immo off Vehicle starts and drives The can is communicating with the cluster as it shows the rpm But I am unable to read it with vcds - just says no communication The wiring harness from the Passat does not have a k-line wire I have added one in and still no communication Also when tested the k-line reads 12v - not sure if it’s correct I read the ecu with vcds before removing it from the Passat And harness and ecu came from the same vehicle could someone please help with some guidance Do I need a can gateway from a Passat to communicate or should vcds beable to pick it up And is the added k-line suppose to read ? Title: Re: Med9 passat 3.6 bws no communication Post by: _nameless on January 11, 2023, 12:44:58 PM Good day you need can h and can l to the port. I have done a swop into my mk4 with a 3.6 bws I have used kess and done an immo off Vehicle starts and drives The can is communicating with the cluster as it shows the rpm But I am unable to read it with vcds - just says no communication The wiring harness from the Passat does not have a k-line wire I have added one in and still no communication Also when tested the k-line reads 12v - not sure if it’s correct I read the ecu with vcds before removing it from the Passat And harness and ecu came from the same vehicle could someone please help with some guidance Do I need a can gateway from a Passat to communicate or should vcds beable to pick it up And is the added k-line suppose to read ? Title: Re: Med9 passat 3.6 bws no communication Post by: gremlin on January 11, 2023, 12:57:21 PM The wiring harness from the Passat does not have a k-line wire I have added one in and still no communication Also when tested the k-line reads 12v - not sure if it’s correct This ecu doesn't have diagnose over K-line. It use CAN bus. Title: Re: Med9 passat 3.6 bws no communication Post by: tahz on January 12, 2023, 01:05:10 AM This ecu doesn't have diagnose over K-line. It use CAN bus. Thank you for confirming this Title: Re: Med9 passat 3.6 bws no communication Post by: tahz on January 12, 2023, 01:13:30 AM you need can h and can l to the port. It is currently connected to where the previous ecu can h and can l was connected The cluster is seeing signal from the ecu In theory if I connect the can h and can l direct to the obd2 port it should read ? Title: Re: Med9 passat 3.6 bws no communication Post by: prj on January 12, 2023, 03:42:48 AM Yes, it will work.
On a Mk4 golf there is no CAN at all in the OBD socket, only the K-Line. So you need to connect CAN H and CAN L also into the OBD socket. Title: Re: Med9 passat 3.6 bws no communication Post by: _nameless on January 12, 2023, 09:24:02 AM Yes, it will work. M3.8.3 may not have can at the port but me7 surly does. At least here in the states, I use a obd port that I've cut out of a junk car to make a bench flash setup, so I can confirm this.On a Mk4 golf there is no CAN at all in the OBD socket, only the K-Line. So you need to connect CAN H and CAN L also into the OBD socket. Title: Re: Med9 passat 3.6 bws no communication Post by: prj on January 12, 2023, 12:41:40 PM M3.8.3 may not have can at the port but me7 surly does. At least here in the states, I use a obd port that I've cut out of a junk car to make a bench flash setup, so I can confirm this. Are you sure that it is PTCAN?I've not looked at the schematics. But IIRC the only connection to ECU on these is through the cluster, first K-Line then W-Line. Title: Re: Med9 passat 3.6 bws no communication Post by: terok on January 13, 2023, 01:39:41 AM CAN wires from diag port only go to gateway (cluster).
Title: Re: Med9 passat 3.6 bws no communication Post by: tahz on January 13, 2023, 08:50:43 AM Yes, it will work. On a Mk4 golf there is no CAN at all in the OBD socket, only the K-Line. So you need to connect CAN H and CAN L also into the OBD socket. I seen the can h and can l wires connected to the obd port and thought it would be Title: Re: Med9 passat 3.6 bws no communication Post by: tahz on January 13, 2023, 08:53:36 AM M3.8.3 may not have can at the port but me7 surly does. At least here in the states, I use a obd port that I've cut out of a junk car to make a bench flash setup, so I can confirm this. This car was originally a 2.8 4motion So it had those wires Title: Re: Med9 passat 3.6 bws no communication Post by: tahz on January 13, 2023, 08:56:16 AM CAN wires from diag port only go to gateway (cluster). Thank you Will be trying to connect the can h and can l directly to the port Title: Re: Med9 passat 3.6 bws no communication Post by: tahz on January 13, 2023, 10:11:36 AM Connected directly to the port and reading perfectly
Thank you so much for all the assistance and knowledge Title: Re: Med9 passat 3.6 bws no communication Post by: prj on January 13, 2023, 12:27:12 PM Yeah gateway won't pass anything to the ECU on these, because all the ECU diags are K-Line.
I have experience only with the older M3.8 stuff and I am pretty sure there were no CAN pins in that connector. Well, OP did not say what year the Mk4 is... so how can I know... Title: Re: Med9 passat 3.6 bws no communication Post by: tahz on January 13, 2023, 09:24:40 PM Yeah gateway won't pass anything to the ECU on these, because all the ECU diags are K-Line. I have experience only with the older M3.8 stuff and I am pretty sure there were no CAN pins in that connector. Well, OP did not say what year the Mk4 is... so how can I know... You are right the me3.8 ecu/ car does not have the can goodies My apologies for not mentioning which mk4 it was Been out of it for awhile and was looking for the info so I don’t unessarily burn anything on my car Thank you again to all it was very useful Figured out the immo delete and vehicle starts and drives Now to figure out the rest of the deletes Thanks again Title: Re: Med9 passat 3.6 bws no communication Post by: Beima on January 03, 2024, 02:40:31 PM Hello, have you finished the project? I'm currently installing bws on mk2. can you share the file?)
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