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Airflow Meter

Inspect airflow meter for damage, and ensure measuring plate or cone moves smoothly. See Fig 1 or Fig 2 . Disconnect airflow meter electrical connector. Move measuring plate or cone, and measure resistance between terminals. See appropriate AIRFLOW METER TERMINAL RESISTANCE  table. Replace sensor as necessary.

AIRFLOW METER TERM RESISTANCE

Terminals (1) Fully Closed: Ohms Fully Open: Ohms
E2 & Vs (2) 200-600 20-1000
E2 & Vc 200-400 200-400
E2 & THAa (3)
-4°F (-20°C) 13,600-18,400 13,600-18,400
68°F (20°C) 2210-2690 2100-2690
140°F (60°C) 493-667 493-667
E1 & Fc Infinite 0
(1) See Fig 1 for terminal identification.
(2) 20-600 ohms on 323 and Protege.
(3) Intake air thermosensor.
AIRFLOW METER TERMINAL RESISTANCE

Terminals (1) Temperature Ohms
E2 & Vs
Closed 68°F (20°C) 20-600
Open 68°F (20°C) 20-1000
E2 & Vc (2) 68°F (20°C) 200-400
E2 & THA (3) -4°F (-20°C) 10,000-20,000
68°F (20°C) 2000-3000
140°F (60°C) 400-700
(1) See Fig 2 for terminal identification.
(2) Measurement is from closed to open.
(3) Intake air thermosensor.
Fig 1: Airflow Meter Terminal ID (MX-3 SOHC, Protege & 323)
G90D18369Courtesy of MAZDA MOTORS CORP.
Fig 2: Airflow Meter Terminal ID (MX-3 DOHC)
G92C24986Courtesy of MAZDA MOTORS CORP.
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