Diagnosis Procedure
- CHECK HEATED OXYGEN SENSOR POWER SUPPLY
- Turn ignition switch OFF.
- Disconnect heated oxygen sensor harness connector.
- Turn ignition switch ON.
- Check the voltage between heated oxygen sensor harness connector and ground.
+
-
Voltage
Heated oxygen sensor
Connector
Terminal
F144
1
Ground
Battery voltage
Is the inspection result normal?
YES
GO TO 3.
NO
GO TO 2.
- CHECK HEATED OXYGEN SENSOR POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Check that #214 fuse is not fusing.
- Check the continuity between heated oxygen sensor harness connector and fuse terminal.
+
-
Continuity
Heated oxygen sensor
Connector
Terminal
F144
1
#214 fuse terminal
Existed
- Also check harness for short to power and short to ground.
Is the inspection result normal?
YES
Perform trouble diagnosis for power supply circuit.
NO
Repair or replace error-detected parts.
- CHECK HEATED OXYGEN SENSOR HEATER CONTROL CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between heated oxygen sensor harness connector and ECM harness connector.
+
-
Continuity
Heated oxygen sensor
ECM
Connector
Terminal
Connector
Terminal
F144
2
F149
95
Existed
3
13
4
37
- Also check harness for short to ground, short to power, and short to each circuit.
Is the inspection result normal?
YES
Replace heated oxygen sensor. Refer to Exploded View .
NO
Repair or replace error-detected parts.