The Air Fuel Ratio AF sensor has an output delay of a few seconds and the Heated Oxygen HO sensor has a maximum output delay of approximately seconds

Case

A/F Sensor (Sensor 1) Output Voltage

HO2 Sensor (Sensor 2) Output Voltage

Main Suspected Trouble Areas

Output voltage More than 3.35 V Less than 3.0 V

Output voltage More than 0.55 V Less than 0.4 V

Output voltage Almost no reaction

Output voltage More than 0.55 V Less than 0.4 V

A/F sensor A/F sensor heater A/F sensor circuit

Output voltage More than 3.35 V Less than 3.0 V

Output voltage Almost no reaction

HO2 sensor HO2 sensor heater HO2 sensor circuit

• Fuel pressure

• Gas leakage from exhaust system

(Air-fuel ratio extremely lean or rich)

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