Checking speed signal: VW Passat B5 (AGP, AGR, AHF, ALH, …)

🧭 Before you start

Fits: VW Passat B5 (3B)

• Special tools named: V.A.G 1551, V.A.G 1552, V.A.G 1598/31

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Secure fault reader to rear seat and operate from this position. — Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select "“Address word”" 01 of engine control unit. (Connect fault reader and select engine control unit )
2. Press keys 0 and 8 for function "“Read measured value block”" and confirm entry with Q key.
3. Press keys 0, 0 and 5 for "“Display group number 5”" and confirm entry with Q key.
4. Carry out road test with a 2nd person to observe display.
5. Observe figure displayed in display zone 3: Specification: Approx. road speed

6. Press → button.
7. Press buttons 0 and 6 for function "“End output”" and confirm entry with Q button.
8. Switch off ignition.
9. Connect test box V.A.G 1598/31 to control unit wiring harness. The engine control unit remains disconnected.
10. Connect multimeter to measure voltage between test box sockets 3 (terminal 15) + 54 (speed signal).
11. Switch on ignition.
12. Lift vehicle at front left.
13. Rotate front wheel and observe voltage display. Specification: between 0 and at least 4 volt fluctuating
14. Check lines to speedometer or speedometer sender:

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