Using Voltmeter
NOTE:
- Before checking, warm up the engine until the engine coolant temperature reaches 80 to 95 °C (176 to 205 °F).
- Use an accurate digital voltmeter.
- Disconnect the Heated Oxygen Sensor (HO2S) connector, and measure the resistance of heater between terminal 3 and terminal 4.
Specification:
- Front HO2S: 5.0-7.0 Ω
- Rear HO2S: 5.0-7.0 Ω
- Replace the Heated Oxygen Sensor (HO2S) if there is a malfunction.
- Apply battery voltage directly between terminal 3 and terminal 4.NOTE: Be careful when applying the voltage. Damage will result if terminals 1 and 2 are connected to any voltage.
- Connect a high-impedance digital-type voltmeter between terminal 1 and terminal 2.
- While repeatedly racing the engine, measure the Heated Oxygen Sensor (HO2S) output voltage.
- If there is a problem, replace the Heated Oxygen Sensor (HO2S).
Tightening torque: 40 - 50 N.m (4.0 - 5.0 kg. m, 29 - 36 lb. ft)