Nissan Sentra B18 (2020-2025) Service Manual: P0101 Maf Sensor

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / P0101 Maf Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P0101	MAF SEN/CIRCUIT-B1 (Mass air flow sensor (bank 1) circuit range/performance)	Diagnosis condition	—
		Signal (terminal)	Mass air flow sensor signal
		Threshold	A high voltage from the mass air flow sensor is sent to ECM under light load driving condition A low voltage from the mass air flow sensor is sent to ECM under heavy load driving condition
		Diagnosis delay time	—

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

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.
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.
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

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.
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
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.

CHECK MASS AIR FLOW (MAF) SENSOR POWER SUPPLY

Turn ignition switch OFF.
Disconnect MAF sensor harness connector.
Turn ignition switch ON.

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.

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.

CHECK MAF SENSOR GROUND CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.

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

Also check harness for short to power.

Is the inspection result normal?

YES >>

GO TO 7.

NO >>

Repair or replace error-detected parts.

CHECK MAF SENSOR INPUT SIGNAL CIRCUIT

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

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

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.
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.
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.
PERFORM EVAP LEAK CHECK

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

>>
GO TO 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.

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.

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