AmIdYfReAk
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« on: February 11, 2016, 08:47:22 AM »
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Hey all,
I've been trying to make a bench harness that would connect a mk4 jetta cluster and ecu and allow them to talk to each other as well as the ODB port.
I've wired it up in accordance to Mitchell ondemand wiring diagram, Then i can communicate with the cluster without an issue but both the cluster and the OBD port cant talk to the Ecu.
If i deviate from the wiring and connect the two K lines between them, Then it cant connect to either and more often than not the OBD adapter will not respond.
Anyone done this before? Any ideas?
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k0mpresd
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« Reply #1 on: February 11, 2016, 09:42:21 AM »
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f1torrents should have this set up working. maybe he will chime in.
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mkxGTi
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« Reply #2 on: February 11, 2016, 03:29:24 PM »
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Cluster/ECU kline to obd, w-line cluster to ecu. And reg pwr/grnds https://forums.tdiclub.com/showthread.php?t=392911Make sure you connect the wiring properly or it will fail to work. |
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AmIdYfReAk
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« Reply #3 on: February 11, 2016, 09:02:18 PM »
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Thanks for the reply guys,
I have it hooked up like your describing minus the CAN-Bus wires are floating currently, and like i said... When i combine the two Klines between the cluster and the ECU it is either holding it high, or pulling it low causing the Cable to Opt out reading it.
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mkxGTi
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« Reply #4 on: February 11, 2016, 09:15:13 PM »
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They do recommend resistors on each side aswell in link i posted. Try it out. Edit: remove ecu kline and hookup canbus to cluster/obd it should fix it.  Pic from tdiclub |
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dream3R
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« Reply #5 on: February 12, 2016, 07:27:32 PM »
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You may have to terminate the bus as well try 60r or 120r if you get no comms.
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AmIdYfReAk
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« Reply #6 on: February 13, 2016, 01:07:15 PM »
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Sorry for the lack of update, Been Fighting off a bad case of food poisoning.... not fun at all.
anyway,
Hooked it up according to the picture and I'm able to get communication via k-line to both the cluster and the ECU, But the Cluster is still tossing the 01314 code ( 01314 - Engine Control Module: No Communications )
I've jumped both 60 and 120 resistors across the can hi and low with no avail.
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mkxGTi
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« Reply #7 on: February 13, 2016, 01:52:25 PM »
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W-line <-
If you have it then recheck. Which ecu are you using?
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AmIdYfReAk
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« Reply #8 on: February 13, 2016, 03:05:30 PM »
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W-line is going from pin 5 on green on the cluster to pin 43 on the ECU.
The ECU is VW ME7.5 1.8T
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AmIdYfReAk
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« Reply #9 on: February 13, 2016, 08:29:30 PM »
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So the CAN-Gateway is tossing the same code ( 01314 ) , I've reversed the can hi and can low on the cluster and it tossed a faulty wiring code as well, So I'm on the correct pins.
Switching it back got that code gone, but the no coms is still there.
I've ohmed the CAN lines on the ECU and they're 60ohms, I've done anything from 50-130 ohms on the cluster side with no avail.
Just for the sake of putting it out there, This is my current config:
12V
Blue:
Pin 1
pin 19
Pin 23
Green:
Pin 14
Grounds:
Blue:
pin 22
pin 5 ( gas gauge )
Pin 24
Green:
pin 13
K line:
Pin 7 from OBD port to Pin 25 ( Blue ) Cluster
W-Line:
Pin 5 ( Green ) Cluster to Pin 43 on the ECU.
Can Hi:
Pin 19 ( green ) on cluster to Pin 60 on ECU
Can-Lo:
Pin 20 ( green ) Cluster to pin 58 on ECU.
Connection to either components via VCDS is no problem at all, but talking among each other seems to be an issue.
Also, When reading the rosstech wiki on fault code 01314, it lists specifically to check the can-bus lines.
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mkxGTi
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« Reply #10 on: February 14, 2016, 05:43:34 AM »
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Two sets of can wires on ecu ( in and out)  2 : +12V ( term.30 ) 5 : GND ( term. 31 ) 16 : +12V ( term. 15 ) 37 : K Line 82 or 7 : CAN High 83 or 6 : CAN Low  2 : +12V ( term.30 ) 5 : GND ( term. 31 ) 16 : +12V ( term. 15 ) 37 : K Line 82 or 7 : CAN High 83 or 6 : CAN Low First is edc 15 other is 7.1.1 |
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AmIdYfReAk
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« Reply #11 on: February 14, 2016, 07:53:24 AM »
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Thank you for the reply, the first illustration seems to be me7 imo, and that's exactly how I have it hooked up.
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mkxGTi
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« Reply #12 on: February 14, 2016, 10:39:15 AM »
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For the sake of trying something, wire up canbus module and see if it works
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AmIdYfReAk
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« Reply #13 on: February 14, 2016, 06:12:28 PM »
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The cluster *is* wired to canbus directly to the ECU.
I don't have another module to plug into it, the wiring tk the obd port is not wired due to the adaptor I'm currently using not supporting can-bus anyway.
I could wire that and use my rostech adaptor and attempt to canbus in, though I didn't think the mk4's played nice with that.
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mkxGTi
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« Reply #14 on: February 14, 2016, 07:47:09 PM »
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i ment using gateway module and cluster and ecu, not wires between ecu and cluster. Only reason i suggested incase immo3 setup.
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