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.

   DTC	+			-	Voltage
   	Heated oxygen sensor 2
   	Bank	Connector	Terminal
   P0037, P0038	1	F71 *1 F82 *2	1	Ground	Battery voltage
   P0057, P0058	2	F70 *1 F81 *2	1

   *1 : With black connector

   *2 : With gray connector

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.

   DTC	Heated oxygen sensor 2			ECM		Continuity
   	Bank	Connector	Terminal	Connector	Terminal
   P0037, P0038	1	F71 *1 F82 *2	2	F79	166	Existed
   P0057, P0058	2	F70 *1 F81 *2	2		163

   *1 : With black connector

   *2 : With gray connector

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

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 (Heated Oxygen Sensor 2 Heater) .

Is the inspection result normal?

YES

INSPECTION END.

NO

Replace malfunctioning heated oxygen sensor 2. Refer to EXHAUST MANIFOLD AND THREE WAY CATALYST .

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.

   DTC	IPDM E/R		Heated oxygen sensor 2		Continuity
   	Connector	Terminal	Connector	Terminal
   P0037, P0038	F19	52	F71 *1 F82 *2	1	Existed
   P0057, P0058			F70 *1 F81 *2	1

   *1 : With black connector

   *2 : With gray connector

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.