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Home >> Subaru >> 1987 >> XT DL >> Repair and Diagnosis >> Engine Performance >> System >> Fuel INJ - MPFI System >> Inspection & Adjustment >> Airflow Meter

Airflow Meter

  1. Check for leaks or damage in connection between air intake boot and airflow meter. Repair any defect noted. Remove connectors from airflow meter, air intake boot and airflow meter for the air cleaner case.
  2. Check exterior of airflow meter for damage. Check for foreign matter, water, or oil in air passages, especially in by-pass. If any abnormality is noticed, replace airflow sensor.
  3. If no defect is found in visual checks. Turn ignition switch to "OFF" position. Attach airflow meter to air cleaner. Disconnect airflow meter, and remove rubber cover from connector.
  4. Measure resistance between body and ground terminals "B" and "BR". Resistance should be 10,000 ohms. If resistance is greater than specified, check harness and internal circuits of control unit for zero continuity. Check ground terminal on the intake manifold for poor connection.
  5. Turn ignition switch to "ON" position (engine off). Connect airflow meter connector. Measure voltage across power terminal "R" and body. Reading should be 10 volts.
  6. If voltage is not within specifications, check condition of parts in power circuit. Attach positive lead of voltmeter to signal terminal "W" and negative lead to ground terminal "BR". Voltage should be 1-2 volts.
  7. If voltage is not within specifications, replace airflow meter. Remove airflow meter from air cleaner. Blow air from air cleaner side to check if voltage across terminals "W" and "B" is greater than that measured in step 5).
  8. If not, replace airflow meter. Install airflow meter on air cleaner. Start engine, and warm until coolant temperature reaches approximately 176°F (80°C). Drive at speed greater than 15 MPH (24 KM/H) for at least one minute.
  9. Run engine at speeds greater than, 2000 RPM. While idling engine, measure voltage across terminal "LgR" of airflow meter connector and body. Zero volts under normal operating conditions is okay.
  10. Turn ignition switch to "OFF" position. Check if 12 volts are present across terminal "LgR" and the body for one second shortly after ignition switch has been turned to "OFF" position.
  11. If 12 volts is not present, check harness from control unit to airflow meter for zero continuity.
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