Mass Air Flow Meter: Inspection

INSPECT MASS AIR FLOW METER

Check the operation.
1. Apply battery voltage across terminals 1 (+B) and 2 (E2G).
2. Using a voltmeter, connect the positive (+) tester prove to terminal 3 (VG) and the negative (-) tester prove to terminal 2 (E2G).
3. Blow air into the mass air flow meter and check that the voltage fluctuates.
  If the voltage does not fluctuate, replace the mass air flow meter.
  
  Fig 1: Inspecting Mass Air Flow Meter
  Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Check the resistance.

Using an ohmmeter, measure the resistance between the terminals.

Standard

STANDARD REFERENCE CHART

Tester Connection	Specified Condition
4 (THA) - 5 (E2)	12.5 to 16.9 kΩ at -20°C (-4°F)
4 (THA) - 5 (E2)	2.19 to 2.67 kΩ at 20°C (68°F)
4 (THA) - 5 (E2)	0.50 to 0.68 kΩ at 60°C (140°F)

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

Fig 2: Measuring Resistance Between Terminals

G05198389

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.