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Checking voltage supply: VW Jetta VI / Golf V / Jetta (CAYB, CAYC, CBDA, CBDB, …)

Step-by-step checking voltage supply for the VW Jetta VI / Golf V / Jetta: 17 steps. 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.

17 steps 12 engine codes engine codes merged from 5 documented variants

🧭 Before you start

Fits: VW Jetta VI (16, 2010–2018), VW Golf V / Jetta (1K, 2003–2009); platform code AJ5

  • Special tools named: VAS 5565
  • Renewed: fuel delivery unit

Don't miss

  • The fuel pump runs very quietly.
  • The fuel pump is now activated for 60 seconds.

🔧 Engine codes this applies to

CAYBCAYCCBDACBDBCBEACEGACFFBCJAACKRACVCADEKAPN

📐 80 workshop diagrams for CAYB

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

Checking voltage supply — CAYB · diagram 1
Checking voltage supply — CAYB · diagram 2
Checking voltage supply — CAYB · diagram 3
Checking voltage supply — CAYB · diagram 4
Checking voltage supply — CAYB · diagram 5
Checking voltage supply — CAYB · diagram 6
Checking voltage supply — CAYB · diagram 7
Checking voltage supply — CAYB · diagram 8
+ 72 more diagrams
🔒 80 workshop diagrams for this job Ask about your VW CAYB — free or sign up free to see the drawings

📋 Procedure

  1. Remove bench seat General body repairs, interior72Rear seats; Removing and installing bench seat.
  2. Unclip cover (1) for fuel delivery unit. Arrow (2) points in direction of travel.
  3. Switch on ignition. [Note: The fuel pump runs very quietly.]
  4. Switch off ignition.
  5. Pull connector (1) off fuel delivery unit flange.
CAYB? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Connect test instrument adapter/DSO (5-pin)VAS 5565 between connector and flange.
  2. Connect hand-held multimeterV.A.G 1526 D to contacts (1) and (5) of adapter.
  3. Connect vehicle diagnosis tester(1) as follows:
  4. Push diagnostic cable connector (2) onto diagnostic connection in driver footwell.
  5. Switch on ignition.
  6. Carry out "“Guided Fault Finding, Checking electrical fuel pump(s)”". [Note: The fuel pump is now activated for 60 seconds.]
  7. Read voltage on hand-held multimeter.
  8. Switch off ignition.
  9. Check activation of fuel pump relay J17 and wiring for open/short circuit .
  10. Remove fuel delivery unit .
  11. Check that the electrical wiring between flange and fuel pump is connected and has continuity.
  12. Fuel pump defective, renew fuel delivery unit .
Workshop diagrams

Ask TorqFix about your VW CAYB — 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 CAYB — 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.