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

Mass Air Flow (MAF) Meter

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OPERATION



This component is found on 2RZ-FE, 3RZ-FE, 5VZ-FE and 1FZ-FE 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



See Figure 1

  1. Remove the air intake hose.
  2.  
  3. Turn the ignition switch to the ON position.
  4.  
  5. Using a voltmeter, attach the positive terminal probe to the terminal VG, and the negative probe to terminal E3.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Testing the E3 and VG circuits

  1. Blow air into the MAF meter, then check that the voltage fluctuates.
  2.  
  3. Turn the ignition switch to the OFF position.
  4.  
  5. Install the air intake hose.
  6.  

REMOVAL & INSTALLATION



2RZ-FE and 3RZ-FE Engines

See Figure 2

  1. Disconnect the MAF harness and the IAT harness along with the wire clamps.
  2.  
  3. Loosen the are cleaner hose clamp.
  4.  
  5. On the 3RZ-FE, disconnect the air hose from the air cleaner cap.
  6.  
  7. Loosen the four clips, then the air cleaner cap with the meter attached.
  8.  
  9. Remove the four nuts, MAF meter and gasket from the cap.
  10.  



Click image to see an enlarged view

Fig. Fig. 2: Exploded view of the MAF meter on the 2RZ-FE and 3RZ-FE engines

  1. Discard the gasket.
  2.  

To install:
  1. Place a new gasket on the air cleaner cap.
  2.  
  3. Install the MAF meter and tighten the nuts to 74 inch lbs. (8 Nm).
  4.  
  5. Install the meter and cap assembly on the air cleaner housing.
  6.  

5VZ-FE Engine

See Figure 3

  1. Disconnect the air cleaner cap from the MAF meter.
  2.  
  3. Detach the harness from the meter.
  4.  
  5. Remove the mounting bolts for the meter. Lift off the meter and discard the gasket.
  6.  



Click image to see an enlarged view

Fig. Fig. 3: Remove the bolts securing the meter

To install:
  1. Place a new gasket in position, then tighten the meter to the cap assembly, 61 inch lbs. (7 Nm).
  2.  
  3. Attach the meter and cap assembly to the air cleaner housing.
  4.  

1FZ-FE Engine

  1. Disconnect the MAF meter harness and wire clamps.
  2.  
  3. Separate the cruise control actuator cable from the unit.
  4.  
  5. Loosen the air cleaner hose.
  6.  
  7. Disconnect the 3 clips, then remove the wing nut, air cleaner cap and meter assembly.
  8.  
  9. Unbolt the meter from the cap. Discard the gasket.
  10.  

To install:
  1. Secure the MAF meter to the cap with a new gasket.
  2.  
  3. Install the cap/meter assembly to the air cleaner housing.
  4.  
  5. Attach the air cleaner hose to the unit.
  6.  
  7. Attach the cruise control actuator cable.
  8.  
  9. Connect the MAF meter harness and wire clamps.
  10.  

 
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