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Airflow Meter

  1. Intake air temperature sensor and fuel pump switch are contained in the airflow meter. Determine terminal identification. See Fig 1 .
  2. Using ohmmeter, measure resistance between designated terminals. See AIRFLOW METER RESISTANCE SPECIFICATIONS  table. Reading must be within specification.
    AIRFLOW METER RESISTANCE SPECIFICATIONS

    Terminals Ohms Temperature
    E2 & Vs
    Non-Turbo 50-500 N/A
    Turbo 200-600 N/A
    E2 & Vref
    Non-Turbo 200-500 N/A
    Turbo 200-400 N/A
    E2 & THAa (1) 10,000-20,000 -4°F (-20°C)
    E2 & THAa (1) 4000-7000 32°F (0°C)
    E2 & THAa (1) 2000-3000 68°F (20°C)
    E2 & THAa (1) 900-1300 104°F (40°C)
    E2 & THAa (1) 400-700 140°F (60°C)
    E1 & Fc Infinity N/A
    (1) Intake air temperature sensor.
  3. Ensure measuring plate moves freely in airflow meter. Remaining terminals must be checked for fuel pump switch and measuring plate resistances. See Fig 1 . Attach ohmmeter to specified terminals to check fuel pump switch and measuring plate resistance. Refer to the FUEL PUMP SWITCH & PLATE RESISTANCE SPECIFICATIONS  table.
FUEL PUMP SWITCH & PLATE RESISTANCE SPECIFICATIONS

Terminals Ohms Plate Position
E1 & Fc Infinity Fully Closed
E1 & Fc 0 Fully Open
E2 & Vs
Non-Turbo 50-500 Fully Closed
Turbo 200-600 Fully Closed
E2 & Vs
Non-Turbo 50-500 Fully Open
Turbo 20-1000 Fully Open
Fig 1: Airflow Meter Resistance & Terminal Identification
G93510Courtesy of MAZDA MOTORS CORP.
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