Diagnosis Procedure
1.
CHECK HO2S2 POWER SUPPLY CIRCUIT
Turn ignition switch OFF.
Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
Turn ignition switch ON.
Check the voltage between HO2S2 harness connector and ground.
+
−
Voltage
HO2S2
Connector
Terminal
E35
1
Ground
Battery voltage
Is the inspection result normal?
.
Repair or replace error-detected parts.
2.
CHECK HO2S2 OUTPUT SIGNAL CIRCUIT
Turn ignition switch OFF.
Disconnect ECM harness connector.
Check the continuity between HO2S2 harness connector and ECM harness connector.
+
−
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
E35
2
F52
70
Existed
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 Incident
Intermittent Incident
.
.
4.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to
Exploded View
.
:
INSPECTION END