TOYOTA PREVIA 91-97 REPAIR MANUAL

4-24 DRIVEABILITY AND EMJSSIONS CONTROLS

Between

terminals

VS - E2

VC - E2

THA - E2

THA - E2

THA - E2

THA - E2

THA - E2

THA - E2

Resistance

200 - 600 Q

200 - 400 Q

10 - 20 kQ

4 - 7 kQ

2 - 3 kO

0.9 - 1.3 kQ

0.4 - 0.7 kQ

0.2 - 0.4 kQ

FC - E1 Infinity

Temperatur

• 
  


• 
  

  -20°C (4°F
  0°C (32° F)
  20°C (68°F
  40° C (104° I
  60°C (140*1
  80°C(176°I

  
  

Fig. 69 On-vehicle VAF meter resistance values— 2TZ-FE t

)

I

1

9091 4G65

igine

REMOVAL & INSTALLATION

1- See Figures 72 and 73

1. Disconnect the VAF meter wiring.


2. Disconnect the air intake temperature sensor wiring.


3. Remove the air cleaner cap and VAF meter as an assembly.


4. To separate the two components, pry off the lock plate, remove the 4
   nuts and washers, lock plate, VAF meter and gasket.


5. Installation is the reverse of removal.

1 Mass Airflow Meter (MAF)

HB^HH^^^I

1 See Figure 74

The Mass Airflow Meter (MAF) is only applicable to the 2TZ-FZE

engines. The MAF uses a platinum hot wire. The hot wire air flow meter

consists of a platinum hot wire, thermistor and control circuit installed in a

plastic housing. The hot wire air flow meter works on the principle that the

FC E1 E2 E2 VS

v—n r—B n—g p—g rB e a i; ,B

Measuring!

Plate

Fig. 70 Measure the resistance between each terminal by mov

ing the measuring plate of the VAF meter

Between

terminals

E2 - VS

Resistance (Q)

Infinity

E2 - VS 20 - 1.200

Measuring pi

opening

Fully closed

Other than clos

position

Futly closed

Fully open

Fig. 71 Off-vehicle VAF meter res/stance values—2TZ-FE engine

Fig. 72 The Volume Airflow Meter is attached to the air cleaner

cap—2TZ-FE engine

Lock

Plate

Pry

Fig. 73 Pry off the lock plate on the VAF meter first when sepa-

rating the two components