Removing and installing electrical wiring harness for unit injectors and glow plugs — AUDI

🧭 Before you start

Fits: Audi A3 (8P, 2003–2012)

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• Puller T10312 must be used to unplug electrical connectors on piezo unit injectors.

🔧 Engine codes this applies to

📋 Procedure

1. Remove air cleaner (top section) Removing and installing air filter element.
2. Remove cylinder head cover 15.
3. To unplug multi-pin connector for unit injectors and glow plugs, pull release pin (arrow 1) and slacken knurled nut (arrow 2). [Note: Puller T10312 must be used to unplug electrical connectors on piezo unit injectors.]
4. Working from the side, slide puller T10312 onto electrical connector on unit injector and pull off connector (arrow).
5. ⚠ Only slacken or tighten the bolts at the retaining clips when removing and installing the electrical wiring harness. If the electrical wiring harness is released from the retaining clips, the clips will become bent and this may lead to a break in the wiring because of the increased amount of play. — Unplug electrical connectors on glow plugs (1).

6. Remove bolts (2) at retaining clips and detach entire electrical wiring harness.
7. Apply special wrench T10310 to adapter ring and slacken by turning 90° in anti-clockwise direction (arrow).
8. Pull retaining clip (1) slightly upwards using a screwdriver and push through main connector (2) towards inside.
9. Insert wiring harness and tighten bolts at retaining clips.
10. Guide main connector through opening in bearing frame.
11. Fit retaining clip.
12. Fit adapter ring at main connector (arrow A).
13. Tighten adapter ring with special wrench T10310 by turning 90° in clockwise direction (arrow B).
14. Install cylinder head cover 15.

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