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Oxygen (O2) Sensor (4-Wire Heated)

  1. Warm engine until coolant temperature is 185-205°F (85-95°C). Disconnect O2 sensor connector. See Fig 1 or Fig 2 . Check resistance of O2 sensor heater element. Connect ohmmeter between specified heater terminals of O2 sensor connector. See O2 SENSOR 4-WIRE CONNECTOR TERMINAL IDENTIFICATION  table.
    NOTE: Stealth and 3000GT turbo models are equipped with 2 O2 sensors (front and rear).
  2. When O2 sensor is at 68°F (20°C), resistance should be approximately 20 ohms. If resistance is not within specification, replace O2 sensor.
    Fig 1: O2 Sensor Connector Terminal ID (4-Wire)(Non-Turbo)
    G90A17368Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 2: O2 Sensor Connector Terminal ID (4-Wire)(Turbo)
    G91H16383Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    CAUTION: DO NOT  apply battery voltage to O2 sensor output terminals; damage to O2 sensor could result.
  3. Heat O2 sensor heater element by applying battery voltage to specified heater terminals. See O2 SENSOR 4-WIRE CONNECTOR TERMINAL IDENTIFICATION  table.
  4. Connect digital voltmeter between specified output terminals. See O2 SENSOR 4-WIRE CONNECTOR TERMINAL IDENTIFICATION  table. Repeatedly race engine and observe O2 sensor output voltage. If O2 sensor output voltage is not 0.6-1.0 volt, replace O2 sensor.
    O2 SENSOR 4-WIRE CONNECTOR TERMINAL IDENTIFICATION

    Application Heater Terminals Output Terminals
    Diamante 3 & 4 1 & 2
    Stealth & 3000GT 2 & 4 1 & 3
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