Heated Oxygen Sensor (HO2S) Inspection

HEATED OXYGEN SENSOR (HO2S) INSPECTION




1. Connect the SSTs (NGS tester) to the DLC-2.




2. Select the "PID/DATA MONITOR AND RECORD" function on the NGS tester.




3. Select "FHO2S R", "RHO2S R", "FHO2S L" and "RHO2S L" on the NGS display. NGS measures and shows the voltage.
- If these Systems are okay, replace the HO2S.
- If not as specified, inspect the following.
- Intake-air system
- Fuel system
- On-Board diagnostic system

Tightening torque: 29 - 49 N.m {3.0 - 5.0 kgf.m, 22 - 36 ft.lbf}

Heater




1. Disconnect the HO2S connector.
2. Measure the resistance between HO2S (front) terminals B and C or between HO2S (rear) terminals C and D using an ohmmeter.
- If not as specified, replace the HO2S.

Specification: Approx. 6 Ohms [20° C {68° F}]

Tightening torque: 29 - 49 N.m {3.0 - 5.0 kgf.m, 22 - 36 ft.lbf}