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Diagnosis Procedure
1.CHECK HO2S2 POWER SUPPLY CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
  3. Turn ignition switch ON.
  4. Check the voltage between HO2S2 harness connector and ground.
    +−Voltage
    HO2S2
    ConnectorTerminal
    E351GroundBattery voltage
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
2.CHECK HO2S2 OUTPUT SIGNAL CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between HO2S2 harness connector and ECM harness connector.
    +−Continuity
    HO2S2ECM
    ConnectorTerminalConnectorTerminal
    E352F5270Existed
  4. Also check harness for short to ground and to power.
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
3.CHECK HEATED OXYGEN SENSOR 2 HEATER
Check the heated oxygen sensor 2 heater. Refer to Component Inspection.
Is the inspection result normal?
Check intermittent incident. Refer to Intermittent IncidentIntermittent Incident.
.
 
4.REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to Exploded View.
: INSPECTION END