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Home >> Volkswagen >> 1993 >> Passat GL, 2.0 C, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - 4-CYL >> Engine Sensors & Switches >> Hall Effect Sensor
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Hall Effect Sensor

  1. Remove fuse No. 18 from fuse/relay panel to prevent fuel pump from running. Disconnect power output stage wiring harness connector from ignition coil.
  2. Connect LED Tester (US 1115) to wiring harness connector terminals No. 2 and 3 using test leads from Adapter Kit (VW 1594). Crank engine and observe LED tester. If LED tester flickers, Hall Effect sensor and its circuit is okay.
  3. If LED tester does not flicker, turn ignition off. Disconnect Hall Effect sensor wiring harness connector at distributor. Connect Digital Volt-Ohmmeter (DVOM) to outer terminals of wiring harness connector.
  4. Turn ignition on. Voltage supply to Hall Effect sensor must be 9 volts minimum. If voltage is not present, check Hall Effect sensor voltage supply circuit back to Electronic Control Module (ECM).
  5. If voltage is present, reconnect Hall Effect sensor wiring harness connector. Use LED tester to backprobe center wire at sensor connector. Connect other end of LED tester to battery positive terminal. Crank engine and observe LED tester.
  6. If LED tester flickers, Hall Effect sensor is okay. If LED tester does not flicker, check sensor wiring harness. If wiring harness is okay, replace Hall Effect sensor or ECM as necessary.
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