Mass Air Flow (MAF) Meter: Inspection

Remove the 2 screws and MAF meter.

Fig 1: Removing Screws And MAF Meter

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1. Using an ohmmeter, measure the resistance between terminals THA and E2.
   Fig 2: Measuring Resistance Between Terminals THA And E2 Using Ohmmeter

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Resistance: 

   RESISTANCE SPECIFICATION
   
   

   -20°C (-4°F)	13.6 to 18.4 Ω
   20°C (68°F)	2.21 to 2.69 Ω
   60°C (140°F)	0.49 to 0.67 Ω

   If the resistance is not as specified, replace the MAF meter.

2. Inspect operation.
   1. Connect the MAF meter connector.
   2. Connect the negative (-) terminal cable to the battery.
   3. Turn the ignition switch ON.
   4. Using a voltmeter, connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
   Fig 3: Connecting Tester Probes To Terminals VG & E2G Using Voltmeter
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   5. Blow air into the MAF meter, and check that the voltage fluctuates.

      If operation is not as specified, replace the MAF meter.

   6. Turn the ignition switch OFF.
   7. Disconnect the negative (-) terminal cable from the battery.
   8. Disconnect the MAF meter connector.

Install the MAF meter with the 2 screws.