Oxygen (O2) Sensor (4-Wire Heated)
- Warm engine until coolant temperature is 185-205°F (85-95°C). Disconnect O2 sensor connector. See Fig 1 . 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.
- When O2 sensor is at 68°F (20°C), resistance should be approximately 12 ohms. If resistance is not within specification, replace O2 sensor.
CAUTION: DO NOT apply battery voltage to O2 sensor output terminals; damage to O2 sensor could result.
- Heat O2 sensor heater element by applying battery voltage to specified heater terminals. See O2 SENSOR 4-WIRE CONNECTOR TERMINAL IDENTIFICATION table.
- 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 Mirage 1.6L 3 & 4 1 & 2