SFI System (2ZZ-GE): Inspection

1. Check the operation.
   1. Apply battery voltage across terminals 1 (+B) and 2 (E2G).
   2. Using a voltmeter, connect the positive (+) tester prove to terminal 3 (VG) and the negative (-) tester prove to terminal 2 (E2G).
   3. Blow air into the mass air flow meter, then check that the voltage fluctuates.

   If the voltage does not fluctuate, replace the mass air flow meter.

   Fig 1: Connecting Positive (+) Tester Prove To Terminal 3 (VG) And Negative (-) Tester Prove To Terminal 2 (E2G)

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2. Check the resistance.
   1. Using an ohmmeter, measure the resistance between the terminals.

   Standard: 

   TESTER CONNECTION AND SPECIFIED CONDITION SPECIFICATION
   
   

   Tester Connection	Specified Condition
   4 (THA) -5 (E2)	13.6 to 18.4 kΩ at -20°C (-4°F)
   4 (THA) -5 (E2)	2.21 to 2.69 kΩ at 20°C (68°F)
   4 (THA) -5 (E2)	0.493 to 0.667 kΩ at 60°C (140°F)

If the result is not as specified, replace the mass air flow meter.

Fig 2: Measuring Resistance Between Terminals

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1. Check the resistance.
   1. Using an ohmmeter, measure the resistance between the terminals.

   Standard: 

   TESTER CONNECTION AND SPECIFIED CONDITION SPECIFICATION
   
   

   Tester Connection	Specified Condition
   1 (+B) -2 (GND)	6.9 to 7.9 kΩ at 20°C (68°F)

   If the result is not as specified, replace the camshaft timing oil control valve.

   Fig 3: Measuring Resistance Between Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the operation.
   1. Apply battery voltage across the terminals, then check that the spool valve operates.

HINT:

The spool valve may not return if foreign objects are caught in the spool valve. It may cause subtle pressure leakage to the advance side, and a DTC may be set.

Fig 4: Applying Battery Voltage Across Terminals, Then Checking Spool Valve Operates

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1. Check the throttle body.
   1. Check that the throttle valve shaft is not rickety.
   2. Check that all ports are not clogged.
   3. Check that the throttle valve opens and closes smoothly.
   4. Check that there is no clearance between the throttle stop screw and throttle lever at the throttle valve closed position.

Fig 5: Checking That There Is No Clearance Between The Throttle Stop Screw And Throttle Lever

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