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Sensors & outputs Trigger

sensor Trigger Draft

Audi AUM crank

1.8T crankshaft position sensor · sensor · Trigger

The 06A 906 433 family (including 06A 906 433 C) is the inductive crank sensor on the Volkswagen and Audi 1.8T, AUM included. It reads the 60-2 wheel. It is not a Hall sensor and it does not take 5 V or 12 V. Race Core lands it on VR 1.

Audi AUM crank sensor

Typical parts: VW / Audi 06A 906 433 C; earlier 06A 906 433 A / E in the same family

Warning — Draft cavity order. Workshop data for the grey G28-style plug assigns contact 1 as signal, 2 as earth, and 3 as screen. Oval and rectangular plugs in this family are not identical. Confirm with an ohmmeter before you crimp.

Device pinout

Looking into the connector, locking tab at the top. Numbers below are the grey-plug assignment. If your plug is the other shape, the ohm reading wins.

Audi AUM crank pinout

  • Connector: 3-way on the 06A 906 433 family sensor
  • Layout (looking into the part): 1 · 2 · 3; polarising key top
Device pinFunctionTypeRace CoreTunerStudio
1VR signalSignalB5VR 1+
2VR returnGroundB13VR 1−
3Cable screenGroundSensor GND at the ECU end only—

Wiring notes

  • The coil is the pair that reads roughly 450–1000 Ω. Those two pins are B5 and B13. The remaining pin is the screen, grounded at the ECU end only — not at the block, and not on both ends.
  • No 5 V and no 12 V on this sensor. A supply pin that shows 5 V key-on means you are not holding a 06A inductive crank sensor.
  • TunerStudio primary trigger for this engine is 60-2, not 36-1. Cam sync is a separate sensor. See the 1.8T application note.
  • Twisted pair from the sensor to the ECU. Keep the run off the coil pack.
  • If the composite log shows a long-low then long-high missing-tooth pair, swap pins 1 and 2 at the sensor. Do not start with Invert.
  • Core EFI V4 and Micro Core VR cavities are TBD. B5 and B13 are Race Core F7.

Failure modes

  • RPM 0 while cranking: gap too large, connector not seated, or the screen shorted to the coil.
  • RPM doubles: the sensor was landed on a Hall input.
  • Timing walks with rpm: polarity inverted, or the pair is running beside the ignition wires.
  • A new sensor with infinite ohms on every pair is a Hall part, or a broken coil. Do not force it onto VR 1.

See also