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Hall Effect Sending Unit

  1. Remove protective cover from Hall Effect sending unit (on distributor) and unplug 3-wire connector from unit. Connect voltmeter to connector terminals No. 1 and No. 3. Turn ignition on. Voltmeter reading should be 9 volts minimum.
  2. If reading is not as specified, check for open circuit in wiring between sending unit and ECU terminals No. 23 and No. 25. See Figure for ECU terminal identifications. If reading is as specified, turn ignition off. Move back connector cover to gain access to rear of 3-wire connector. Reinstall 3-wire connector to distributor Hall sending unit.
  3. Connect voltmeter between terminals No. 1 and No. 2 at rear of 3-wire connector. Remove distributor cap, rotor and dust cover. Turn crankshaft by hand until rotor window clears sending unit. Turn ignition on. Voltmeter should read minimum of 4 volts.
  4. Turn crankshaft until rotor window aligns with sending unit. Voltmeter should read 0-.5 volt. Turn ignition off. If readings are not as specified, replace Hall Effect sending unit. If readings are as specified, check wiring between Hall Effect sending unit and ECU for open or short circuit and repair as necessary. If circuits are okay, replace ECU.
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