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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old December 13th, 2017, 11:54   #1
Trevor801
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Join Date: Dec 2016
Location: Nc
Unhappy Fried something in CAN bus. Kicking myself...

So after successfully completing a 5 speed swap on my 04 bew golf I started on the wiring. Being in too much of a rush I "accidentally" sent 12v down the orange and black CAN high wire at the tcu harness. No more start....
No glow plug light, no cell, just turns over and over. I have it at a shop right now they have tried a second ecu and cluster. They are able to communicate with all modules but say they are not communicating with each other. The 109 relay seems to be fine, so I'm pretty sure I fried at least one module in the CAN network. I'm going to the shop tomorrow and will try to post a full scan. They want to put the load reduction relay 175 back to stock instead of the 53 I have in there now for safety switch and the other wires I cut for reverse and speed. Sorry so long, was hoping someone would have some insight other than the obvious huge mistake I made... Would like to have a working car after putting all the time and money so far.
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