The Rabbit TDI Project
Part 4: Wiring 1
Or: a snake pit of 12 Volts
The mystery and the magic of the TDI engine comes from the electronic control of everything.
The nightmare and confusion of the TDI engine comes from the electronic control of everything.
If you can read the bently wiring diagrams, you can make it all work.
Or make most of it work...
Or at least make some of it work...
Once the old engine was out, I removed the dash and dug into the fusebox.
After careful review of the Rabbit wiring diagram (8 pages) and prolonged study of
the TDI engine wiring diagram (13 pages) and the G/J standard equipment diagrams (20 pages), I hacked up the wiring of the Rabbit. Let no wire go unsnipped.
I removed all of the wiring associated with the old engine, and the other stuff that was unneeded. (seatbelt warning buzzer and such...)
This is the pile left on the floor after a good chop session:
I mounted the ECU on a stand in the raintray just to the passenger side of the interior fan.
A few new holes were drilled to pass the wires thru the raintray into the engine compartment.
For the wiring going to the engine compartment, I mounted a hobby box in the driver's side of the raintray, and drilled thru into the interior.
The Westmoreland Rabbit fuseboxes are quite nice and easy to work on. The wires simply unclip, or clip in. As a result, all of my new fuses are part of the old fusebox. For the new relays I used VW oem relay receivers that snap into the clips on the top of the fusebox.
There are a lot of wires to run.
In my case, I didn't get the interior portion of the harness with the engine, so all of that stuff I had to fabricate from scratch. The hobby box/wire passthru is also where I joined my new interior harness to the engine/ecu harness.
Due to my relocation of some sensors I ended up pulling one of the ecu harnesses almost completely apart. Oh joy and bliss...
The 1.8T guys can always run a standalone engine management system.
There is no such system for a modern diesel. I suppose I could've gone with a mechanical fuel pump, but where is the fun in that?
summary: lots of wiring
Part 1: Introduction
Part 2: Installing the Engine
Part 3: Transmission
Part 4: Wiring 1
Part 5: Speedometer and Cluster
Part 6: ImmobilizerIII
Part 7: Drive By Wire
Part 8: Intercooler
Part 9: Intake and Exhaust
part 10: MFA and Cruise Control
Part 11: The Dash
Part 12: The Little Things
Part 13: The End (for now)
Part 14: 6spd transmission and brake upgrades
One Year Later
Who Needs a VR6