SFI System (3MZ-FE): Inspection

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

   Standard: 

   RESISTANCE CHECK
   
   

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

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

Fig 1: Inspecting Mass Air Flow Meter

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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.

2. Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 2, and check the movement of the valve.

Fig 2: Inspecting Camshaft Timing Oil Control Valve Assy

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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.

1. Check the accelerator pedal position sensor (see DTC P0120, P0122, P0123, P0220, P0223, P2135; THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT LOW INPUT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT HIGH INPUT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT HIGH INPUT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "A"/"B" VOLTAGE CORRELATION ).

1. Check the throttle position sensor (see DTC P0120, P0122, P0123, P0220, P0223, P2135; THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT LOW INPUT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT HIGH INPUT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT HIGH INPUT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "A"/"B" VOLTAGE CORRELATION ).
2. Check the throttle control motor.
   1. Measure the resistance between terminals 2 (M+) and 1 (M-).

   Resistance: 0.3 to 100 Ω at 20°C (68°F) 

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

Fig 3: Inspecting Throttle Body Assy

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1. Measure the resistance between terminals

   Standard: 

   RESISTANCE CHECK
   
   

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

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

Fig 4: Inspecting Engine Coolant Temperature Sensor

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1. Measure the resistance between the terminals.

   Resistance: 120 to 280 kΩ at 20°C (68°F) 

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

Fig 5: Inspecting Knock Sensor

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1. Remove the EFI relay from the engine room J/B,
2. Remove the A/F relay from the engine room R/B No. 2.
3. Measure the resistance of the relay.

   Standard: 

   RESISTANCE CHECK
   
   

   Tester Connection	Specified Condition
   3-5	10 kΩ 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 6: Inspecting Relay (Marking: EFI, A/F)

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1. Remove the circuit opening relay from the R/B sub-assy.
2. Measure the resistance of the relay.

   Standard: 

   RESISTANCE CHECK
   
   

   Tester Connection	Specified Condition
   3-5	10 kΩ 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 7: Inspecting Circuit Opening Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002