SFI System (1MZ-FE/3MZ-FE): Inspection

1. Check the output voltage.
   1. Apply battery voltage across terminals 1 (+B) and 2 (E2G).
   2. Using a voltmeter, connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
   3. Blow air into the MAF meter, and check that the voltage fluctuates.
2. Measure the resistance between terminals 4 (THA) and 5 (E2).

   Standard: 

   RESISTANCE SPECIFICATIONS
   
   

   Condition	Specified Condition
   -20°C (-4°F)	13.6 to 18.4 Ω
   20°C (68°F)	2.21 to 2.69 Ω
   60°C (140°F)	0.493 to 0.667 Ω

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

1. Measure the resistance between the terminals.

   Standard: 6.9 to 7.9 Ω at 20°C (68°F) 

   If the result is not as specified, replace the OCV assy.

   Fig 1: Identifying Mass Air Flow Meter Connector Terminals

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2. Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 2, and check the movement of the valve.
   NOTE: Confirm that the valve moves freely and does not become stuck in any position.

If necessary, replace the OCV assy.

HINT:

If the valve cannot return properly because of foreign matter, a small pressure leak in the advanced direction may occur and a DTC will be output.

Fig 2: Connecting Battery's Positive (+) Lead To Terminal 1 And Negative (-) Lead To Terminal 2

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1. Measure the resistance between the terminals.

   Standard: 

   RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Specified Condition
   2 (VPA2) - 3 (EP1)	5.0 Ω or less
   5 (VPA1) - 1 (EP2)	5.0 Ω or less
   6 (VCP1) - 3 (EP1)	2.25 to 4.75 Ω
   4 (VCP2) - 1 (EP2)	2.25 to 4.75 Ω

   Fig 3: Identifying Accelerator Pedal Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If the result is not as specified, replace the pedal assy.

1. Measure the resistance between the terminals.

   Standard: 

   RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   2 (M+) - 1 (M-)	20°C (68°F)	0.3 to 100 Ω
   5 (VC) - 3 (E2)	20°C (68°F)	2.0 to 4.0 Ω

   Fig 4: Identifying Throttle Body Connector Terminals

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If the result is not as specified, replace the throttle body assy.

1. Measure the resistance between each terminal.

   Standard: 

   RESISTANCE SPECIFICATIONS
   
   

   Condition	Specified Condition
   Approx. 20°C (68°F)	2.32 to 2.59 Ω
   Approx. 80°C (176°F)	0.310 to 0.326 Ω

If the result is not as specified, replace the sensor.

Fig 5: Inspecting Engine Coolant Temperature Sensor

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1. Using an ohmmeter, measure the resistance between the terminal and body.

   Standard: 10 Ω or higher 

   HINT:

   If the result is not as specified, replace the sensor.

   Fig 6: Inspecting Knock Sensor (1MZ-FE ENGINE TYPE)

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

   Standard: 120 to 280 Ω at 20°C (68°F) 

   HINT:

   If the result is not as specified, replace the sensor.

   Fig 7: Inspecting Knock Sensor (3MZ-FE ENGINE TYPE)

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1. Using an ohmmeter, measure the resistance of the relay.

   Standard: 

   RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Specified Condition
   3-5	10 Ω or higher
   3-5	Below 1Ω (when battery voltage is applied to terminals 1 and 2)

If the result is not as specified, replace the relay.

Fig 8: Inspecting Relay (Marking EFI, C/OPN)

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