Pinout Overview for 1.8T-HARNESS-034M

Pinout Diagram for 1.8T Universal Coil Pack Partial Harness (1.8T-HARNESS-034M)

Dialing in the ignition system on your VW/Audi 1.8T? The 1.8T Universal Coil Pack Partial Harness (1.8T-HARNESS-034M) is designed to simplify wiring, clean up the bay, and keep your coil pack signals organized and reliable.

This guide provides a clear pinout diagram for the harness, mapping each Deutsch connector pin to its matching chassis ground, ECU signal, and 12V power feed. Whether you're installing a fresh harness, integrating a standalone ECU, or troubleshooting misfires, this pinout makes wiring straightforward.

What this pinout covers:

  • Deutsch connector pin numbers (1–12)
  • Wire colors (Green, Grey, Red)
  • ECU signal references (C1–C4)
  • Chassis grounds for stable, low-noise operation
  • 12V power distribution to each coil circuit
  • Proper mapping for coil pack sub-circuits on the 1.8T platform

Built for tuners, wiring specialists, and DIY enthusiasts, this pinout follows an OEM-plus approach, giving you a clean, logical layout that's easy to read and easy to replicate. Pair this diagram with the 1.8T-HARNESS-034M and you'll spend less time guessing wires.

Use this reference any time you install, repair, or verify your 1.8T Universal Coil Pack Partial Harness—it's the perfect companion for a reliable ignition setup on your 1.8T build.

Video Overview of the 1.8T Coil Setup:



Wiring Diagram:


Pin Designations:

DEUTSCH PIN PIN 6 — GREY PIN 5 — GREY PIN 4 — GREEN PIN 3 — GREEN PIN 2 — GREEN PIN 1 — GREEN
CHASSIS C3 GRND C4 GRND C4 ECU SIGNAL C3 ECU SIGNAL C2 ECU SIGNAL C1 ECU SIGNAL
CHASSIS C2 GRND C1 GRND C4 12V C3 12V C2 12V C1 12V
DEUTSCH PIN PIN 7 — GREY PIN 8 — GREY PIN 9 — RED PIN 10 — RED PIN 11 — RED PIN 12 — RED
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