Diagnosis Procedure

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

   Courtesy of NISSAN NORTH AMERICA, INC.

Is exhaust gas leak detected?

>>

Repair or replace error-detected parts.

>>

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?

>>

Repair or replace error-detected parts.

>>

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
   Connector	Terminal	Connector	Terminal
   F68	1	F79	101	Existed
   	2		102

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

   A/F sensor 1		-	Continuity
   Connector	Terminal
   F68	1	Ground	Not existed
   	2

   ECM		-	Continuity
   Connector	Terminal
   F79	101	Ground	Not existed
   	102

6. Also check harness for short to power.

Is the inspection result normal?

>>

GO TO 4.

>>

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 Description .
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 4000 RPM for 1 minute under no load.
6. Let engine idle for 1 minute.
7. Keep engine speed between 2500 and 3000 RPM for 20 minutes.
8. Check 1st trip DTC.

Is 1st trip DTC detected?

>>

Replace A/F sensor.

>>

GO TO 6.

Check fuel pressure. Refer to Work Procedure .

Is the inspection result normal?

>>

GO TO 8.

>>

GO TO 7.

Check fuel hoses and fuel tubes for clogging.

Is the inspection result normal?

>>

Replace fuel level sensor unit and fuel pump. Refer to Removal and Installation .

>>

Repair or replace error-detected parts.

With CONSULT

1. Install all removed parts.
2. Check "Mass air flow sensor (Hz) B1" in "Data Monitor" mode of "ENGINE". For specification, refer to Component Inspection (Mass Air Flow Sensor) .

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 .

Is the measurement value within the specification?

>>

GO TO 9.

>>

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

   Courtesy of NISSAN NORTH AMERICA, INC.

   Clicking sound should be heard.

Is the inspection result normal?

>>

INSPECTION END

>>

Perform trouble diagnosis for fuel injector, refer to Diagnosis Procedure .