Lexus NX: Mass Air Flow Meter

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (engine Control) / Mass Air Flow Meter

Components

COMPONENTS

ILLUSTRATION

MASS AIR FLOW METER SUB-ASSEMBLY

On-vehicle Inspection

ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

NOTICE:

Perform the mass air flow meter sub-assembly inspection according to the procedures below.
Only replace the mass air flow meter sub-assembly when the mass air flow value in the Data List (with the engine stopped) is not within the normal operating range or there is foreign matter on the mass air flow meter platinum hot wire (heater).

PROCEDURE

1. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

NOTICE:

Perform the inspection with the vehicle indoors and on a level surface.
Perform the inspection of the mass air flow meter sub-assembly while it is installed to the air cleaner cap sub-assembly (installed to the vehicle).
During the test, do not use an exhaust air duct on the exhaust pipe.

HINT:

Perform "Inspection After Repairs" after replacing the mass air flow meter sub-assembly.

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(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG) (do not run the engine).

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / MAF.

Powertrain > Engine and ECT > Data List

Tester Display
MAF

(e) Wait 30 seconds, and then read the values on the Techstream.

Standard:

Item	Condition	Specified Condition
MAF	Engine not running 30 seconds after power switch turned on (IG)	0.58 gm/sec or less

If the result is not as specified, replace the mass air flow meter sub-assembly.

If the result is as specified, inspect the mass air flow meter sub-assembly.

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Removal

REMOVAL

PROCEDURE

1. REMOVE MASS AIR FLOW METER SUB-ASSEMBLY

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Remove the 2 screws and mass air flow meter sub-assembly.

Inspection

INSPECTION

PROCEDURE

1. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

(a) Perform a visual check for any foreign matter on the platinum hot wire (heater) of the mass air flow meter sub-assembly as shown in the illustration.

OK:

There is no foreign matter.

*a	Platinum Hot Wire (Heater)

(b) Check the intake air temperature sensor (built into the mass air flow meter sub-assembly).

(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (THA) - 2 (E2)	-20°C (-4°F)	13.6 to 18.4 kΩ
	20°C (68°F)	2.21 to 2.69 kΩ
	60°C (140°F)	0.49 to 0.67 kΩ

If the result is not as specified, replace the mass air flow meter sub-assembly.

*a	Component without harness connected (Mass Air Flow Meter Sub-assembly)

Installation

INSTALLATION

CAUTION / NOTICE / HINT

HINT:

Perform "Inspection After Repairs" after replacing the mass air flow meter sub-assembly.

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PROCEDURE

1. INSTALL MASS AIR FLOW METER SUB-ASSEMBLY

HINT:

Perform "Inspection After Repairs" after replacing the mass air flow meter sub-assembly.

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(a) Install the mass air flow meter sub-assembly with the 2 screws.

(b) Connect the mass air flow meter sub-assembly connector.

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Lexus NX: Mass Air Flow Meter

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