TESTING

Testing can be done without removing the MAF meter from the vehicle.

1. If necessary, remove the MAF meter from the vehicle.
2. Disconnect the wiring from the airflow meter.
3. Using an ohmmeter, measure the resistance between each terminal (THA and E2) as shown in the charts.

   Fig. 1: Mass air flow meter terminal identification — 2TZ-FZE engine

4. If the resistance is not as specified, replace the air flow meter.

   Fig. 2: Mass Airflow Meter resistance values — 2TZ-FZE engine

5. Inspect the meter operation. Connect the MAF meter wiring.
6. Connect a voltmeter to the positive (+) test probe to the VG and the negative (-) test probe to terminal E3.

   Fig. 3: Attach the test probe terminals to the E3 (first pin) and VG (fourth pin) from the left of the MAF meter — 2TZ-FZE engine

7. Blow air into the meter and check that the voltage fluctuates.
8. If the operation is not as specified, replace the MAF meter.