DTC Diagnosis Procedure

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

Is the inspection result normal?

YES

GO TO 2.

NO

Repair or replace ground connection.

1. Loosen and retighten the A/F sensor 1 and heated oxygen sensor 2. Refer to TURBOCHARGER : Exploded View .(A/F sensor 1) and refer to CATALYST : Exploded View . (Heated oxygen sensor 2).

GO TO 3.

1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before the three way catalyst 2.

Is exhaust gas detected?

YES

Repair or replace.

NO

GO TO 4.

1. Start engine and run it at idle.
2. Listen for an intake air leak after the mass air flow sensor.

Is intake air leak detected?

YES

Repair or replace.

NO

GO TO 5.

1. Clear the mixture ratio self-learning value. Refer to Work Procedure .
2. Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0175 detected? Is it difficult to start engine?

YES

Perform trouble diagnosis for DTC P0175. Refer to DTC Diagnosis Procedure .

NO

GO TO 6.

1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Check harness connector for water.

   Water should not exit.

Is the inspection result normal?

YES

GO TO 7.

NO

Repair or replace harness connector.

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

   +			-	Voltage
   A/F sensor 1
   Bank	Connector	Terminal
   2	F134	1	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 9.

NO

GO TO 8.

1. Turn ignition switch ON.
2. Check the voltage between A/F sensor 1 harness connector and IPDM E/R harness connector.

   A/F sensor 1			IPDM E/R		Continuity
   Bank	Connector	Terminal	Connector	Terminal
   2	F134	1	E123	52	Existed

3. 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
   2	F134	3	F142	106	Existed
   		4		105

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
   2	F134	3	Ground	Not existed
   		4

   ECM			--	Continuity
   Bank	Connector	Terminal
   2	F142	106	Ground	Not existed
   		105

5. Also check harness for short to power.

Is the inspection result normal?

YES

GO TO 10.

NO

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

Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 11.

NO

GO TO 13.

Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 12.

NO

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

Refer to Inspection .

Is the inspection result normal?

YES

GO TO 13.

NO

Repair or replace.

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

Do you have CONSULT?

YES

GO TO 14.

NO

GO TO 15.

With CONSULT

1. Turn ignition switch ON.
2. On CONSULT screen, select "ENGINE">>"Data Monitor">>"A/F ADJ-B1" and "A/F ADJ-B2".
3. Make sure that "0.000" is displayed on CONSULT screen.

Is "0.000" displayed?

YES

INSPECTION END

NO

GO TO 15.

Clear the mixture ratio self-learning value. Refer to Work Procedure .

Do you have CONSULT?

YES

GO TO 16.

NO

INSPECTION END

With CONSULT

1. Turn ignition switch ON.
2. On CONSULT screen, select "ENGINE">>"Data Monitor">>"A/F ADJ-B1" and "A/F ADJ-B2".
3. Make sure that "0.000" is displayed on CONSULT screen.

INSPECTION END