DTC Diagnosis Procedure

1. Turn ignition switch OFF.
2. Check ground connection E191. Refer to Ground Inspection Inspection .

Is the inspection result normal?

YES

GO TO 2.

NO

Repair or replace ground connection.

1. Disconnect A/F sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and ground.

   +			-	Voltage
   A/F sensor 1
   Bank	Connector	Terminal
   1	F133	1	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 4.

NO

GO TO 3.

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

   IPDM E/R		A/F sensor 1		Continuity
   Connector	Terminal	Connector	Terminal
   E123	52	F133	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.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

   A/F sensor 1			ECM		Continuity
   Bank	Connector	Terminal	Connector	Terminal
   1	F133	3	F142	102	Existed
   		4		101

4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.

   A/F sensor 1			--	Continuity
   Bank	Connector	Terminal
   1	F133	3	Ground	Not existed
   		4

   ECM			--	Continuity
   Bank	Connector	Terminal
   1	F142	102	Ground	Not existed
   		101

5. Also check harness for short to power.

Is the inspection result normal?

YES

Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to TURBOCHARGER : Exploded View .

NO

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