Mass Air Flow (MAF) Meter: Inspection

1. Apply battery voltage across terminals 1 (+B) and 2 (E2G).
2. Connect the positive (+) tester probe to terminal 3 (VG), and the negative (-) tester probe to terminal 2 (E2G).
3. Blow air into the MAF meter, and check if the voltage fluctuates.

Using an ohmmeter, measure the resistance between terminals 4 (THA) and 5 (E2).

Fig 1: Measuring Resistance Between MAF Terminals THA And E2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Resistance: 

12.5 to 16.9 k Ω at -20° C (-4° F) 

2.19 to 2.67 k Ω at 20° C (68° F) 

0.50 to 0.68 k Ω at 60° C (140° F) 

Fig 2: Inspecting MAF Meter Operation

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. If using a hand-held tester:
   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch to the ON position.
   3. Blow air into the MAF meter, and check that the air flow value of the CURRENT DATA changes.

   If operation is not as specified, check the MAF meter (see DTC P0101: MASS OR VOLUME AIR FLOW CIRCUIT RANGE/ PERFORMANCE PROBLEM and DTC P0110, P0112, P0113: INTAKE AIR TEMPERATURE CIRCUIT LOW/HIGH INPUT ) as well as the wiring and the ECM.

2. If not using a hand-held tester:
   1. Turn the ignition switch to the ON position.
   2. Connect the positive tester probe of the voltmeter to terminal VG of the ECM and the negative tester probe of the voltmeter to terminal E2G of the ECM.
   3. Blow air into the air flow meter, and check if the voltage fluctuates.
   Fig 3: Checking Voltage
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If operation is not as specified, check the MAF meter (see DTC P0101: MASS OR VOLUME AIR FLOW CIRCUIT RANGE/ PERFORMANCE PROBLEM and DTC P0110, P0112, P0113: INTAKE AIR TEMPERATURE CIRCUIT LOW/HIGH INPUT ), the wiring and the ECM.