Toyota Venza: Mass Air Flow Meter

Toyota Venza Service Manual / 1ar-fe Engine Control / Mass Air Flow Meter

Components

COMPONENTS

ILLUSTRATION

On-vehicle Inspection

ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

NOTICE:

Perform the mass air flow meter inspection according to the procedure below.
Only replace the mass air flow meter 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).

HINT:

Perform "Inspection After Repairs" after replacing the mass air flow meter (See page ).

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 while it is installed to the air cleaner case (installed to the vehicle).
During the test, do not use the exhaust air duct to perform suction on the exhaust pipe.

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON (do not run the engine).

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

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

Standard:

Item	Condition	Specified Condition
MAF	Engine not running 30 seconds after turning ignition switch to ON	Less than 0.5 g/sec.

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 (See page ).

Removal

REMOVAL

PROCEDURE

1. REMOVE MASS AIR FLOW METER SUB-ASSEMBLY

(a) Disconnect the mass air flow meter connector.

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

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 shown in the illustration.

Text in Illustration

*1	Platinum Hot Wire (Heater)

OK:

There is no foreign material.

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

(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
1 (THA) - 2 (E2)	20°C (68°F)	2.21 to 2.69 kΩ
1 (THA) - 2 (E2)	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.

Text in Illustration

*1	Component without harness connected (Mass Air Flow Meter)

Installation

INSTALLATION

PROCEDURE

1. INSTALL MASS AIR FLOW METER SUB-ASSEMBLY

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

NOTICE:

Make sure that the O-ring is not cracked or jammed when installing the mass air flow meter.

HINT:

Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly (See page ).

(b) Connect the mass air flow meter connector.

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