LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Audi >> 1991 >> 100 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Ignition System 2.2L >> Timing Control Systems >> Hall Effect Sending Unit
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Hall Effect Sending Unit

  1. Remove protective cover from Hall Effect sending unit (on distributor) and unplug connector. Connect voltmeter to harness connector terminals No. 1 (negative) and No.3 (Red/Black wire).
  2. Turn ignition on. Voltmeter reading should be greater than 9 volts. If reading is not as specified, check for open circuit in wiring between ECU terminals No. 23 and No. 25, and Hall Effect sending unit. See Figure for ECU terminal identification.
  3. If reading is as specified, turn ignition off. Move connector cover to access rear of 3-wire connector. Install connector to distributor Hall Effect sending unit. Connect voltmeter between terminals No. 1 (negative) and No. 2 (Green wire) at rear of connector.
  4. Remove distributor cap, rotor and dust cover. Turn crankshaft by hand until rotor window is clear of sending unit. Turn ignition on. Voltmeter should indicate minimum of 4 volts.
  5. Turn crankshaft until rotor window fully aligns with sending unit. Voltmeter should indicate 0-.5 volt. Turn ignition off. If readings are not as specified, replace Hall Effect sending unit.
  6. If readings are as specified, check wiring between Hall Effect sending unit and ECU for short or open circuits. Repair wires if necessary. If circuits are okay, replace ECU.
scientia non olet · About LEMON Manuals