Toyota Tundra Service Manual: Mass Air Flow Meter

Components

COMPONENTS

ILLUSTRATION

Inspection

INSPECTION

PROCEDURE

1. INSPECT MASS AIR FLOW METER

(a) Check the output voltage.

(1) Apply battery voltage across terminals 1 (+B) and 2 (E2G).

NOTICE:

While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur.

(2) Using a voltmeter, connect the positive (+) tester probe to terminal 3 (VG), and negative (-) tester probe to terminal 2 (E2G).

(3) Blow air into the MAF meter, and check that the voltage fluctuates.

If the result is not as specified, replace the MAF meter.

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

OK:

There is no foreign material.

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

(c) Check the IAT sensor.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4 (THA) - 5 (E2)

-20°C (-4°F)

12.5 k to 16.9 kΩ

4 (THA) - 5 (E2)

20°C (68°F)

2.19 k to 2.67 kΩ

4 (THA) - 5 (E2)

60°C (140°F)

0.50 k to 0.68 kΩ

If the result is not as specified, replace the MAF meter.

Installation

INSTALLATION

CAUTION / NOTICE / HINT

HINT:

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

PROCEDURE

1. INSTALL MASS AIR FLOW METER

HINT:

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

(a) Install the MAF meter with the 2 screws.

Torque:

1.7 N·m {17 kgf·cm, 15 in·lbf}

(b) Connect the MAF connector.

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. CHECK MASS AIR FLOW METER

(a) Check the mass air flow value.

(1) Connect the Techstream to the DLC3.

(2) Turn the ignition switch to ON.

(3) Turn the Techstream main switch ON.

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

(5) Blow air into the MAF meter, and check that the MAF value fluctuates.

If the result is not as specified, check the MAF meter (See page ), or wiring and ECM (See page ).

Removal

REMOVAL

PROCEDURE

1. REMOVE MASS AIR FLOW METER

(a) Disconnect the MAF connector.

(b) Remove the 2 screws and MAF meter.

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