2003 Lexus ES 300FACTORY OEM SERVICE PROCEDURE

Section 249 (Engine Control System (SFI) (2AZ-FE)): Inspection

WARNING: This page is about a different car, the 2004 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT MASS AIR FLOW METER 
    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: 

    AIR FLOW METER CHECKING REFERENCE

    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
    G02852821Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY 
    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: Connecting Battery To Terminals
      G02852822Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE: Confirm that the valve moves freely and does not become stuck in any position.

    If necessary, replace the OCV assy.

    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.

  3. INSPECT ACCELERATOR PEDAL ASSY (ACCELERATOR PEDAL POSITION SENSOR) 
    1. Measure the resistance between the terminals.

      Standard: 

    TESTER CONNECTION AND CONDITION-SPECIFICATION

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

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

    Fig 3: Inspecting Accelerator Pedal Assy
    G02852823Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT THROTTLE BODY ASSY 
    1. Measure the resistance between the terminals.

      Resistance: 

    TERMINALS CONDITION AND RESISTANCE SPECIFICATION

    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) 1.2 to 3.2kΩ

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

    Fig 4: Inspecting Throttle Body Assy
    G02852824Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT ENGINE COOLANT TEMPERATURE SENSOR 
    1. Measure the resistance between the terminals.

      Standard: 

    TERMINAL CONDITION AND RESISTANCE SPECIFICATION

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

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

    Fig 5: Inspecting Engine Coolant Temperature Sensor
    G02852825Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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