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Hall Effect Sending Unit

  1. Remove protective cover from Hall Effect sending unit (on distributor) and unplug connector from unit. Connect voltmeter to connector terminals No. 1 and 3. Turn ignition on. Voltmeter reading should be 9 volts minimum.
  2. If reading is incorrect, check for open circuit in wiring between ECU terminals No. 23 and 25, and sending unit. If reading is correct, turn ignition off. Move back connector cover to gain access to rear of 3-wire connector. Reinstall connector to distributor Hall sending unit. Connect voltmeter between terminals No. 1 and 2 at rear of connector.
  3. Remove distributor cap, rotor, and dust cover. Turn crankshaft by hand until rotor window clears sending unit. Turn ignition on. Voltmeter should indicate 4 volts minimum.
  4. Turn crankshaft until rotor window fully aligns with sending unit. Voltmeter should indicate 0-.5 volts. Turn ignition off. If readings are incorrect, replace Hall sending unit. If readings are correct, check wiring between Hall Effect sending unit and ECU for shorts or opens in wires.
  5. Repair wires if necessary. If circuits are okay, replace ECU.
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