Caution / Notice / Hint

NOTE:

Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.
Refer to "Data List / Active Test" [O2 Heater B1S2 and O2 Heater Curr Val B1S2].
Refer to DATA LIST / ACTIVE TEST [12/2012 - ]
When the values for the Data List item O2 Heater Curr Val B1S2 is not 0 A, the heater is on.
Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
Change the fuel injection volume using the Control the Injection Volume function provided in the Active Test and monitor the heated oxygen sensor output voltage (Refer to CAUTION / NOTICE / HINT ). If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.