Diagnosis Procedure

1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in Circuit 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 EXHAUST MANIFOLD AND THREE WAY CATALYST .

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 Description .
2. Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?

YES

Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to Diagnosis Procedure or 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.

   DTC	+			-	Voltage
   	A/F sensor 1
   	Bank	Connector	Terminal
   P2096 P2097	1	F72	1	Ground	Battery voltage
   P2098 P2099	2	F73	1

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.

   DTC	A/F sensor 1			IPDM E/R		Continuity
   	Bank	Connector	Terminal	Connector	Terminal
   P2096 P2097	1	F72	1	F19	53	Existed
   P2098 P2099	2	F73	1

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.

   DTC	A/F sensor 1			ECM		Continuity
   	Bank	Connector	Terminal	Connector	Terminal
   P2096 P2097	1	F72	3	F79	102	Existed
   			4		101
   P2098 P2099	2	F73	3		111
   			4		107

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

   DTC	A/F sensor 1			--	Continuity
   	Bank	Connector	Terminal
   P2096 P2097	1	F72	3	Ground	Not existed
   			4
   P2098 P2099	2	F73	3
   			4

   DTC	ECM			--	Continuity
   	Bank	Connector	Terminal
   P2096 P2097	1	F79	102	Ground	Not existed
   			101
   P2098 P2099	2		111
   			107

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 Diagnosis Procedure .

Is the inspection result normal?

YES

GO TO 11.

NO

GO TO 13.

Refer to Diagnosis Procedure .

Is the inspection result normal?

YES

GO TO 12.

NO

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

Perform Intermittent Incident .

Is the inspection result normal?

YES

GO TO 13.

NO

Repair or replace.

Replace air fuel ratio (A/F) sensor 1. Refer to EXHAUST MANIFOLD AND THREE WAY CATALYST .

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 Description .

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