DTC Diagnosis Procedure

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

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Is exhaust gas leak detected?

YES

Repair or replace error-detected parts.

NO

GO TO 2.

1. Listen for an intake air leak after the mass air flow sensor.
2. Check PCV hose connection.

Is intake air leak detected?

YES

Repair or replace error-detected parts.

NO

GO TO 3.

1. Turn ignition switch OFF.
2. Disconnect corresponding A/F sensor 1 harness connector.
3. Disconnect ECM harness connector.
4. 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

5. 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

6. Also check harness for short to power.

Is the inspection result normal?

YES

GO TO 4.

NO

Repair or replace error-detected parts.

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

GO TO 5.

1. Clear the mixture ratio self-learning value. Refer to Work Procedure .
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3, 500 and 4, 000 rpm for 1 minute under no load.
6. Let engine idle for 1 minute.
7. Keep engine speed between 2, 500 and 3, 000 rpm for 20 minutes.
8. Check 1st trip DTC.

Is 1st trip DTC detected?

YES

Replace A/F sensor.

NO

GO TO 6.

Check fuel pressure. Refer to Work Procedure .

Is the inspection result normal?

YES

GO TO 8.

NO

GO TO 7.

Check fuel hoses and fuel tubes for clogging.

Is the inspection result normal?

YES

Replace "fuel filter and fuel pump assembly". Refer to FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY : Removal & Installation .

NO

Repair or replace error-detected parts.

With CONSULT

1. Install all removed parts.
2. Check "MASS AIR FLOW SENSOR (Hz)" and "Mass air flow sensor B2 (Hz)" in "Data Monitor" mode of "ENGINE".

   For specification, Refer to Component Inspection .

With GST

1. Install all removed parts.
2. Check mass air flow sensor signal in Service $01 with GST.

   For specification, Refer to MASS AIR FLOW SENSOR : Service Data .

Is the measurement value within the specification?

YES

GO TO 9.

NO

Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or grounds. Refer to DTC Diagnosis Procedure .

With CONSULT

1. Start engine.
2. Perform "POWER BALANCE" in "Active Test" mode of "ENGINE".
3. Make sure that each circuit produces a momentary engine speed drop.

Without CONSULT

1. Start engine and let it idle.
2. Listen to each fuel injector operating sound.

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   Clicking sound should be heard.

Is the inspection result normal?

YES

INSPECTION END

NO

Perform trouble diagnosis for FUEL INJECTOR, Refer to Diagnosis Procedure .