Toyota Pick-ups/Land Cruiser/4Runner 1989-1996

Volume Air Flow (VAF) Meter

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OPERATION



This component is used on 22R-E, 1FZ-FE, 3VZ-E and 3F-E engines.

This meter measures the amount of air flowing through the intake system. It is used by the ECM to calculate air/fuel mixture.

TESTING



22R-E, 1FZ-FE and 3VZ-E Engines

See Figure 1

  1. Disconnect the wiring from the VAF meter.
  2.  
  3. Using an ohmmeter, measure the resistance between terminals E2 and VS. Resistance should be as follows:
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Attach the ohmmeter to terminals E2 and VS



22R-E-200-400 ohms
 
1FZ-FE and 3VZ-E-200-600 ohms
 

  1. If the test is not within specification, replace the unit.
  2.  

3F-E Engines

See Figure 2

  1. Disconnect the wiring from the VAF meter.
  2.  
  3. Using an ohmmeter, measure the resistance between terminals E2 and VC.
  4.  



Click image to see an enlarged view

Fig. Fig. 2: Attach the ohmmeter to terminals E2 and VC on 3F-E engines

  1. The reading should be between 200-400 ohms.
  2.  
  3. If the test is not within specification, replace the unit.
  4.  

REMOVAL & INSTALLATION



22R-E Engine

See Figures 3, 4, 5, 6 and 7

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the intake air connector.
  4.  



Click image to see an enlarged view

Fig. Fig. 3: Loosen the clamp surrounding the intake air hose

You may need to disconnect nearby hoses.



Click image to see an enlarged view

Fig. Fig. 4: Slide the hose off of the sensor

  1. Unplug the VAF meter connector. Remove the air cleaner cap with the VAF meter still attached.
  2.  



Click image to see an enlarged view

Fig. Fig. 5: Detach the electrical harness from the sensor

  1. Remove the retainer bolts, 4 nuts, washers, VAF meter and gasket from the air cleaner cap.
  2.  



Click image to see an enlarged view

Fig. Fig. 6: Remove the mounting nuts and washers



Click image to see an enlarged view

Fig. Fig. 7: Slip the unit from the air cleaner housing

To install:
  1. Attach the VAF meter with a new gasket to the air cleaner, then tighten until snug.
  2.  
  3. Connect the VAF meter wiring.
  4.  
  5. Install the intake air connector.
  6.  
  7. Connect the negative battery cable.
  8.  
  9. Start the engine and check for proper functions.
  10.  

1FZ-FE Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the VAF meter electrical connector and wire clamp.
  4.  
  5. Disconnect the cruise control actuator cable.
  6.  
  7. Remove the air cleaner cap, VAF meter and silencer as follows:
    1. Disconnect the air cleaner hose from the VAF meter.
    2.  
    3. Disconnect the air hose from the air suction reed valve.
    4.  
    5. Disconnect the 3 clamps, remove the wing nut, air cleaner cap, VAF meter and silencer.
    6.  

  8.  
  9. Remove the 4 nuts, plate washers, VAF meter, gasket and 4 collars. Remove the 2 screws, bolt and bolt bracket. Disconnect the VAF meter from the air cleaner cap.
  10.  

To install:
  1. Install the VAF meter to the air cleaner cap. Install the bracket to the VAF meter and tighten the fasteners to 43 inch lbs. (5 Nm). Place a new gasket and 4 collars on the VAF meter. Install the VAF meter to the air cleaner cap and tighten retainer nuts to 7 ft. lbs. (10 Nm).
  2.  
  3. Install the air cleaner cap to the air cleaner case with the 3 clips and wing nut. Connect the air hose to the air suction reed valve. Connect the air cleaner hose to the VAF meter.
  4.  
  5. Connect the cruise control actuator cable. Connect the VAF meter connector and wire clamp.
  6.  
  7. Connect the negative battery cable.
  8.  

3VZ-E Engine

See Figure 8

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the air hose and remove the 2 bolts from the resonator bracket. Disconnect the resonator bracket.
  4.  
  5. Disconnect the VAF meter connector. Disconnect the air cleaner hose connector.
  6.  



Click image to see an enlarged view

Fig. Fig. 8: Exploded view of the VAF meter on the 3VZ-E engine

  1. Remove the air cleaner cap with the VAF meter assembly attached. Remove the retainers and the bracket from the meter assembly. Pry off the locking plate and and remove the 4 nuts, washers, lock plate, volume air flow meter and gasket.
  2.  

To install:
  1. Install the VAF meter to the air cleaner cap. Install the meter, new gasket, lock plate, washer and 4 nuts. Pry the locking plate on the nut and install the bracket.
  2.  
  3. Install the air cleaner cap and VAF meter assembly. Install the air cleaner hose.
  4.  
  5. Connect the VAF meter connection. Install the resonator bracket with the 2 bolts. Connect the air hose.
  6.  
  7. Connect the negative battery cable.
  8.  

3F-E Engine

  1. Disconnect the air flow meter wiring harness.
  2.  
  3. Remove the air cleaner hose.
  4.  
  5. Unbolt the air flow meter from the vehicle and discard the gasket.
  6.  

To install:
  1. Attach the air flow meter with a new gasket.
  2.  
  3. Connect the air cleaner hose.
  4.  
  5. Connect the air flow meter harness.
  6.  

 
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