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Checking CAN data bus wiring — VW

Checking CAN data bus wiring on VW: 10 steps, engines AMF, ANY, AYZ. What to remove, in what order, and what to check after.

Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.

10 steps 3 engine codes engine codes merged from 2 documented variants

🧭 Before you start

Fits: platform code 6E1

🔧 Engine codes this applies to

AMFANYAYZ

📐 41 workshop diagrams for AMF

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

Checking CAN data bus wiring — AMF · diagram 1
Checking CAN data bus wiring — AMF · diagram 2
Checking CAN data bus wiring — AMF · diagram 3
Checking CAN data bus wiring — AMF · diagram 4
Checking CAN data bus wiring — AMF · diagram 5
Checking CAN data bus wiring — AMF · diagram 6
Checking CAN data bus wiring — AMF · diagram 7
Checking CAN data bus wiring — AMF · diagram 8
+ 33 more diagrams
🔒 41 workshop diagrams for this job Ask about your VW AMF — free or sign up free to see the drawings

📋 Procedure

  1. Release connector from ABS control unit and pull it off.
  2. Release connector on engine control unit and pull connector off.
  3. Check the CAN data bus wiring for short to one another:
  4. Perform a resistance measurement between test box sockets 25 + 3 on 68-pin adapter cableV.A.G 1598/18A again:
  5. Repair the fault in the wiring using current flow diagram:
AMF? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Connect 121-pin adapter cableV.A.G 1598/31 to control unit wiring harness.
  2. Check CAN data bus wiring between test box sockets for open circuit referring to current flow diagram.
  3. Check wiring additionally for short circuit to battery positive or earth.
  4. Connect adapterV.A.G 1598/21 to ABS control unit wiring harness.
  5. Check CAN data bus wiring between adapterV.A.G 1598/21 and 121-pin adapter cableV.A.G 1598/31 for open circuit referring to current flow diagram:
Workshop diagrams

Ask TorqFix about your VW AMF — it answers with the exact sequence for that engine and the workshop drawing for each step. First question is free after a 20-second sign-up, no card.

Ask about your VW AMF — free → or sign up free to see the drawings

Other VW procedures

Who makes these pages, and how

TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.

The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.

Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.

Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com

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Workshop data on this page last updated 20 Sep 2026.