Airflow Meter (AFM): 323

Inspect airflow meter body for cracks or damage. Using an ohmmeter, check resistance between sensor terminals. See AIRFLOW METER SPECIFICATIONS table. Pry open measuring plate with a screwdriver and measure resistance between terminals "E2" and "Vc" (fuel pump switch), and between terminals "E2" and "Vs". See Figure . If readings are incorrect replace AFM assembly.

323 AIRFLOW METER SPECIFICATIONS

Terminal

Resistance (Ohms)

E2-Vs

20-400

E2-Vc

100-300

E2-Vb

200-400

E2-THA (At Temperature Indicated)

-4°F (-20°C)

10,000-20,000

0°F (0°C)

4000-7000

68°F (20°C)

900-1300

140°F (60°C)

400-700

E1-Fc

Infinity

E1-FC

⁽¹⁾ Infinity

E2-VS

⁽²⁾ 20-400

⁽¹⁾	With measuring plate fully closed. Reading should be zero ohms with plate fully open.

⁽²⁾	With measuring plate fully closed. Reading should be 20-1000 ohms with plate fully open.

Fig 1: Measuring Airflow Meter Resistance (323)

Courtesy of MAZDA MOTORS CORP.