DTC Diagnosis Procedure

1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 2 harness connector.
3. Turn ignition switch ON.
4. Check the voltage between heated oxygen sensor 2 harness connector and ground.

   +			-	Voltage
   Heated oxygen sensor 2
   Bank	Connector	Terminal
   1	F125	1	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 2.

NO

GO TO 4.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between heated oxygen sensor 2 harness connector and ECM harness connector.

   +			-		Continuity
   Heated oxygen sensor 2			ECM
   Bank	Connector	Terminal	Connector	Terminal
   1	F125	2	F143	6	Existed

4. Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

GO TO 3.

NO

Repair open circuit, short to ground or short to power in harness or connectors.

Check heated oxygen sensor 2 heater. Refer to Component Inspection .

Is the inspection result normal?

YES

INSPECTION END.

NO

Replace malfunctioning heated oxygen sensor 2. Refer to CATALYST : Exploded View .

1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between IPDM E/R harness connector and heated oxygen sensor 2 harness connector.

   +		-		Continuity
   IPDM E/R		Heated oxygen sensor 2
   Connector	Terminal	Connector	Terminal
   E123	52	F125	1	Existed

4. Also check harness for short to ground.

Is the inspection result normal?

YES

Perform the trouble diagnosis for power supply circuit.

NO

Repair or replace error-detected parts.