MASS AIR FLOW METER INSPECTION

PROCEDURE

1. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

   
   

   1. Check the output voltage.

      
      
      1. 

         *a	Component without harness connected (Mass Air Flow Meter Sub-assembly)
         	Air

         Connect a battery positive (+) lead to terminal 1 (+B) and negative (-) lead to terminal 2 (E2G).

         Note

         While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur.

      2. Connect the positive (+) tester probe to terminal 3 (VG) and negative (-) tester probe to terminal 2 (E2G).

      3. Blow air into the mass air flow meter sub-assembly and check that the voltage fluctuates.

         Tester Connection	Condition	Specified Condition
         C5-3 (VG) - C5-2 (E2G)	Blow air into the mass air flow meter sub-assembly C5-1 (+B) - Auxiliary battery positive (+) C5-2 (E2G) - Auxiliary battery positive (-)	Voltage fluctuates

         If the result is not as specified, replace the mass air flow meter sub-assembly.

   2. 

      *a	Platinum Hot Wire (Heater)
      *b	Temperature Sensor (Thermistor)

      Perform a visual check for any foreign matter on the platinum hot wire (heater) and temperature sensor (thermistor) of the mass air flow meter sub-assembly shown in the illustration.

      OK
      There is no foreign matter.

      If the result is not as specified, replace the mass air flow meter sub-assembly.

   3. 

      *a	Component without harness connected (Mass Air Flow Meter Sub-assembly)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition C5-4 (THA) - C5-5 (E2) -20°C (-4°F) 12.5 to 16.9 kΩ C5-4 (THA) - C5-5 (E2) 20°C (68°F) 2.19 to 2.67 kΩ C5-4 (THA) - C5-5 (E2) 60°C (140°F) 0.50 to 0.68 kΩ

      If the result is not as specified, replace the mass air flow meter sub-assembly.