Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSNISSAN-DATSUN2024FRONTIER SL, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM (DTC/CIRCUIT DIAGNOSIS) (1 OF 6)DTC/CIRCUIT DIAGNOSISDTC P0103: MAF SENSORCOMPONENT INSPECTION (MASS AIR FLOW SENSOR)

2024 Nissan-Datsun Frontier SL, RWD

Component Inspection (Mass Air Flow Sensor)

2024 Nissan-Datsun Frontier SL, RWDSECTION Component Inspection (Mass Air Flow Sensor)

CHECK MASS AIR FLOW SENSOR-I

With CONSULT

Turn ignition switch OFF.
Reconnect all harness connectors disconnected.
Start engine and warm it up to normal operating temperature.
On CONSULT screen, select "ENGINE">>"Data Monitor".

Check "Mass air flow sensor (Hz) B1" indication as following.

Monitor item	Condition	Indication
Mass air flow sensor (Hz) B1	Ignition switch ON (Engine stopped.)	Approx. 3, 300 Hz
	Idle (Engine is warmed-up to normal operating temperature.)	2700 - 3000 Hz
	2500 RPM (Engine is warmed-up to normal operating temperature.)	2100 - 2400 Hz
	4000 RPM (Engine is warmed - up normal operating temperature.)	1800 Hz - 2100 Hz

Without CONSULT

Turn ignition switch OFF.
Reconnect all harness connectors disconnected.
Start engine and warm it up to normal operating temperature.

Check the frequency between ECM harness connector terminals under the following conditions.

ECM			Condition	Frequency
Connector	+	-
Connector	Terminal	Terminal
F78	33 (MAF sensor signal)	30	Ignition switch ON (Engine stopped.)	Approx. 3, 300 Hz
			Idle (Engine is warmed-up to normal operating temperature.)	2700 - 3000 Hz
			2500 RPM (Engine is warmed-up to normal operating temperature.)	2100 - 2400 Hz
			4000 RPM (Engine is warmed - up normal operating temperature.)	1800 Hz - 2100 Hz

Is the inspection result normal?

INSPECTION END

GO TO 2.

CHECK FOR THE CAUSE OF UNEVEN AIR FLOW THROUGH MASS AIR FLOW SENSOR
1. Turn ignition switch OFF.
2. Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
  - Crushed air ducts
  - Malfunctioning seal of air cleaner element
  - Uneven dirt of air cleaner element
  - Intake valve deposits
  - Improper specification of intake air system parts
Is the inspection result normal?

>>

GO TO 4.

>>

GO TO 3.

CHECK MASS AIR FLOW SENSOR-II

With CONSULT

Repair or replace malfunctioning part.
Start engine and warm it up to normal operating temperature.
On CONSULT screen, select "ENGINE">>"Data Monitor".

Check "Mass air flow sensor (Hz) B1" indication as following.

Monitor item	Condition	Indication
Mass air flow sensor (Hz) B1	Ignition switch ON (Engine stopped.)	Approx. 3, 300 Hz
	Idle (Engine is warmed-up to normal operating temperature.)	2700 - 3000 Hz
	2500 RPM (Engine is warmed-up to normal operating temperature.)	2100 - 2400 Hz
	4000 RPM (Engine is warmed - up normal operating temperature.)	1800 Hz - 2100 Hz

Without CONSULT

Repair or replace malfunctioning part.
Start engine and warm it up to normal operating temperature.

Check the frequency between ECM harness connector terminals under the following conditions.

ECM			Condition	Frequency
Connector	+	-
Connector	Terminal	Terminal
F78	33 (MAF sensor signal)	30	Ignition switch ON (Engine stopped.)	Approx. 3, 300 Hz
			Idle (Engine is warmed-up to normal operating temperature.)	2700 - 3000 Hz
			2500 RPM (Engine is warmed-up to normal operating temperature.)	2100 - 2400 Hz
			4000 RPM (Engine is warmed - up normal operating temperature.)	1800 Hz - 2100 Hz

Is the inspection result normal?

INSPECTION END

GO TO 4.

CHECK MASS AIR FLOW SENSOR-III

With CONSULT

Turn ignition switch OFF.
Disconnect mass air flow sensor harness connector and reconnect it again.
Start engine and warm it up to normal operating temperature.
On CONSULT screen, select "ENGINE">>"Data Monitor".

Check "Mass air flow sensor (Hz) B1" indication as following.

Monitor item	Condition	Indication
Mass air flow sensor (Hz) B1	Ignition switch ON (Engine stopped.)	Approx. 3, 300 Hz
	Idle (Engine is warmed-up to normal operating temperature.)	2700 - 3000 Hz
	2500 RPM (Engine is warmed-up to normal operating temperature.)	2100 - 2400 Hz
	4000 RPM (Engine is warmed - up normal operating temperature.)	1800 Hz - 2100 Hz

Without CONSULT

Turn ignition switch OFF.
Disconnect mass air flow sensor harness connector and reconnect it again.
Start engine and warm it up to normal operating temperature.

Check the frequency between ECM harness connector terminals under the following conditions.

ECM			Condition	Frequency
Connector	+	-
Connector	Terminal	Terminal
F78	33 (MAF sensor signal)	30	Ignition switch ON (Engine stopped.)	Approx. 3, 300 Hz
			Idle (Engine is warmed-up to normal operating temperature.)	2700 - 3000 Hz
			2500 RPM (Engine is warmed-up to normal operating temperature.)	2100 - 2400 Hz
			4000 RPM (Engine is warmed - up normal operating temperature.)	1800 Hz - 2100 Hz

Is the inspection result normal?

INSPECTION END

Clean or replace malfunctioning mass air flow sensor.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.