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CONTROL SYSTEM - Airflow Meter

F-135prose procedure
Continued from F-134

AIRFLOW METER

Inspection

Airflow Meter Inspection

  1. 1
    Remove the airflow meter. (Refer to page F-92.)
    Cutaway view of the airflow meter with internal labels: POTENTIOMETER (top), INTAKE AIR THERMO SENSOR (lower left), FUEL PUMP SWITCH (lower left), MEASURING PLATE (lower middle). To the right is a schematic showing the fuel pump switch, the potentiometer resistor (zigzag), the intake air thermosensor symbol, and a connector pinout labeled Fc, E1, E2, Vc, E2, Vs, THAA.
    69G04A-177
  2. 2
    Check the airflow meter body for cracks.
  3. 3
    Verify that the measuring plate moves smoothly.
  4. 4
    Disconnect the connector from the airflow meter.
    Airflow meter with ohmmeter probes connected to two terminals on the connector to check resistance.
    05U0FX-206
  5. 5
    Move the measuring plate and check for resistance between the terminals with an ohmmeter.
    Airflow meter with measuring plate being moved while ohmmeter checks resistance through the potentiometer.
    05U0FX-207
  6. 6
    Connect the airflow meter connector after checking.

Airflow Meter Resistance

E2 ↔ Vs
Condition
Resistance (Ω) Fully closed200—600
Resistance (Ω) Fully open20—1,000
E2 ↔ Vc
Condition
Resistance (Ω) Fully closed200—400
Resistance (Ω) Fully open200—400
E2 ↔ THAA (Intake air thermosensor)
Condition−20°C (−4°F)
Resistance (Ω) Fully closed13,600—18,400
Resistance (Ω) Fully open13,600—18,400
E2 ↔ THAA (Intake air thermosensor)
Condition20°C (68°F)
Resistance (Ω) Fully closed2,210—2,690
Resistance (Ω) Fully open2,210—2,690
E2 ↔ THAA (Intake air thermosensor)
Condition60°C (140°F)
Resistance (Ω) Fully closed493—667
Resistance (Ω) Fully open493—667
E1 ↔ Fc
Condition
Resistance (Ω) Fully closed∞
Resistance (Ω) Fully open0
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See also

F-92INTAKE AIR SYSTEM

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