Dtc Description

DTC Description

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors

  • Mass air flow sensor circuit is open or shorted.

  • Accelerator pedal position sensor 2 circuit is shorted.

  • Intake camshaft position sensor circuit is shorted.

  • Fuel rail pressure sensor circuit is shorted.

  • Engine oil pressure sensor circuit is shorted.

  • Refrigerant pressure sensor circuit is shorted.

• Mass air flow sensor

• Accelerator pedal position sensor 2

• Intake camshaft position sensor

• Fuel rail pressure sensor

• Engine oil pressure sensor

• Refrigerant pressure sensor

• Intake air leaks

• Electric throttle control actuator

• PCV hose air leak

• Purge hose air leak

• Throttle deposit

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

1. CHECK DTC PRIORITY

   If DTC P0101 is displayed with other DTC, first perform the trouble diagnosis for other DTC.

   Is applicable DTC detected?

   YES >>

   Perform diagnosis of applicable. Refer to DTC Index.

   NO >>

   GO TO 2.

2. PRECONDITIONING

   If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

   If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch ON) instead of running engine at idle speed.

   >>

   GO TO 3.

3. PERFORM DTC CONFIRMATION PROCEDURE

   1. Start the engine and warm it up to normal operating temperature.

   2. Start engine and drive the Nissan Sentra vehicle as per the similar conditions to Freeze Frame Data for more than 5 seconds.

      Hold the accelerator pedal as steady as possible.

      CAUTION:

      Always drive Nissan Sentra vehicle in safe manner according to traffic conditions and obey all traffic laws when driving.

      • ENGINE SPEED

      • COOLANT TEMP

      • VEHICL SPEED

   Is DTC detected?

   YES >>

   Proceed to DTC Diagnosis Procedure.

   NO-1 >>

   To check malfunction symptom before repair: Refer to Intermittent Incident.

   NO-2 >>

   Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

1. CHECK DTC PRIORITY

   If DTC P0101 is displayed with other DTC, first perform the trouble diagnosis for other DTC.

   Is applicable DTC detected?

   YES >>

   Perform diagnosis of applicable. Refer to DTC Index.

   NO >>

   GO TO 2.

2. CHECK HARNESS CONNECTOR

   1. Disconnect mass air flow (MAF) sensor harness connector and ECM harness connector.

   2. Connect MAF sensor harness connector and ECM harness connector.

   3. Perform DTC Confirmation Procedure. Refer to Confirmation Procedure.

   Is 1st trip DTC detected?

   YES >>

   GO TO 3.

   NO >>

   INSPECTION END

3. CHECK INTAKE SYSTEM

   Check the following for connection.

   • Air duct

   • Vacuum hoses

   • Intake air passage between air duct and intake manifold

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   Reconnect the parts.

4. CHECK MASS AIR FLOW (MAF) SENSOR POWER SUPPLY

   1. Turn ignition switch OFF.

   2. Disconnect MAF sensor harness connector.

   3. Turn ignition switch ON.

   4. Check the voltage between MAF sensor harness connector and ground.

      +		−	Voltage
      MAF sensor
      Connector	Terminal
      F31	1	Ground	5.0 V

   Is the inspection result normal?

   YES >>

   GO TO 6.

   NO >>

   GO TO 5.

5. CHECK SENSOR POWER SUPPLY 2 CIRCUIT

   Perform Diagnosis Procedure.

   Is the inspection result normal?

   YES >>

   Perform the trouble diagnosis for power supply circuit.

   NO >>

   Repair or replace error-detected parts.

6. CHECK MAF SENSOR GROUND CIRCUIT

   1. Turn ignition switch OFF.

   2. Disconnect ECM harness connector.

   3. Check the continuity between MAF sensor harness connector and ECM harness connector.

      +		−		Continuity
      MAF sensor		ECM
      Connector	Terminal	Connector	Terminal
      F31	3	F24	23	Existed

   4. Also check harness for short to power.

   Is the inspection result normal?

   YES >>

   GO TO 7.

   NO >>

   Repair or replace error-detected parts.

7. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT

   1. Check the continuity between MAF sensor harness connector and ECM harness connector.

      +		−		Continuity
      MAF sensor		ECM
      Connector	Terminal	Connector	Terminal
      F31	2	F24	26	Existed

   2. Also check harness for short to ground and to power.

   Is the inspection result normal?

   YES >>

   GO TO 8.

   NO >>

   Repair or replace error-detected parts

8. CHECK INTAKE AIR TEMPERATURE SENSOR

   Check the intake air temperature sensor. Refer to Component Inspection.

   Is the inspection result normal?

   YES >>

   GO TO 9.

   NO >>

   Replace MAF sensor. Refer to Exploded View.

9. CHECK PCV VALVE

   Check the PCV valve. Refer to POSITIVE CRANKCASE VENTILATION : Periodic Maintenance.

   Is the inspection result normal?

   YES >>

   GO TO 10.

   NO >>

   Replace PCV valve.

10. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

    Check the EVAP control system pressure sensor. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    GO TO 11.

    NO >>

    Replace EVAP control system pressure sensor. Refer to Removal and Installation.

11. PERFORM EVAP LEAK CHECK

    Perform the EVAP leak check. Refer to EVAPORATIVE EMISSION SYSTEM : Inspection.

    >>

    GO TO 12.

12. CHECK THROTTLE POSITION SENSOR

    Check the followings with the freeze frame data of DTC P0101

    ENGINE SPEED	Idling speed
    VEHICL SPEED	０ KM/H
    S-FUEL TRM-B1	not 125%

    Is the freeze frame data under the above condition?

    YES >>

    Perform idle air volume learning. Refer to Work Procedure.

    NO >>

    GO TO 13.

13. CHECK MAF SENSOR

    Check the MAF sensor. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    Check intermittent incident. Refer to Intermittent Incident.

    NO >>

    Replace MAF sensor. Refer to Exploded View.