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SFI System (1ZZ-FE (4WD)): Inspection

  1. INSPECT INTAKE AIR FLOW METER SUB-ASSY 
    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.
        Fig 1: Checking Battery Voltage Using Voltmeter
        G02678031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

        Standard: 

        RESISTANCE SPECIFICATION (1 OF 7)

        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)
        Fig 2: Measuring Resistance Between Terminals
        G02678032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY 
    1. Check the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

        Standard: 

        RESISTANCE SPECIFICATION (2 OF 7)

        Tester Connection Specified Condition
        1(+B)-2(GND) 6.9 to 7.9 kΩ at 20°C (68°F)
        Fig 3: Inspecting Camshaft Timing Oil Control Valve Assy
        G02678033Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    2. Check the operation.
      1. Apply battery voltage across the terminals, then check that the spool valve operates.
        Fig 4: Checking Battery Voltage
        G02678034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE: Check that the spool valve is not stuck.

    HINT:

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

  3. INSPECT THROTTLE BODY ASSY 
    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: Identifying Throttle Body Screw
        G02678035Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE: Do not touch the throttle stop screw.
  4. INSPECT E.F.I. THROTTLE POSITION SENSOR 
    1. Check the resistance.
      1. Disconnect the throttle position sensor connector.
      2. Using an ohmmeter, measure the resistance between terminals VC and E2.

        Resistance: 2.5 to 6.0 kΩ 

        Fig 6: Identifying Position Sensor Connector Terminals
        G02678036Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Check the resistance variation between terminals VTA and E2.

        Variation of resistance: 

        The resistance value Increases in proportion to the throttle lever opening value. 

        HINT:

        RESISTANCE SPECIFICATION (3 OF 7)

        Throttle valve Movement Resistance
        Fully close 0.2 to 5.7kΩ
        Fully open 2.0 to 10.2 kΩ

    If the result is not as specified, replace the E.F.I. throttle position sensor.

  5. INSPECT E.F.I. ENGINE COOLANT TEMPERATURE SENSOR 
    1. Check the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

        Standard: 

        RESISTANCE SPECIFICATION (4 OF 7)

        Teeter Connection Specified Condition
        1(E2)-2(THW) 2.32 to 2.59 kΩ at 20°C (68°F)
        1(E2)-2(THW) 0.310 to 0.326 kΩ at 80°C(176°F)
        Fig 7: Checking E.F.I. Engine Coolant Temperature Sensor
        G02678037Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE: If checking the engine coolant temperature sensor in water, be careful not to allow water to intrude into the terminals. After checking, wipe up water on the engine coolant temperature sensor.

    If the result is not as specified, replace the engine coolant temperature sensor.

  6. INSPECT KNOCK SENSOR 
    1. Check the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

        Standard: 

        RESISTANCE SPECIFICATION (5 OF 7)

        Tester Connection Specified Condition
        1 (Ground) -2 (Output) 120 to 280 kΩ at 20°C (68°F)
        Fig 8: Inspecting Knock Sensor Terminals
        G02678038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  7. INSPECT E.F.I. CIRCUIT OPENING RELAY ASSY 
    1. Check the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

        Standard: 

        RESISTANCE SPECIFICATION (6 OF 7)

        Tester Connection Specified Condition
        3-5 10 kΩ or higher
        3-5 Below 1 Ω (Apply battery voltage to terminal 1 and 2)
        Fig 9: Inspecting E.F.I. Circuit Opening Relay Assy
        G02678039Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the result is not as specified, replace the E.F.I. circuit opening relay assy.

  8. INSPECT E.F.I ECU RELAY 
    1. Check the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

        Standard: 

        RESISTANCE SPECIFICATION (7 OF 7)

        Tester Connection Specified Condition
        3-5 10 kΩ or higher
        3-5 Below 1 Ω (Apply battery voltage to terminal 1 and 2)
        Fig 10: Inspecting E.F.I ECU Relay
        G02678040Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the result is not as specified, replace the E.F.I ECU relay.

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