2021 Lexus LS 500h AWDFACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection [10/2017 - ]: Procedure

  1. INSPECT E.F.I. VACUUM SENSOR ASSEMBLY (MANIFOLD ABSOLUTE PRESSURE SENSOR) 
    1. Check the power source voltage.
      1. Disconnect the E.F.I. vacuum sensor assembly (manifold absolute pressure sensor) connector.
      2. Turn the power switch on (IG).
      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Condition Specified Condition
        D11-3 (VC) - D11-2 (E2) IG ON 4.75 to 5.25 V
        D11-1 (PIM) - D11-2 (E2) IG ON 3.0 to 5.25 V
    2. Check the intake manifold pressure.
      1. Connect the Techstream to the DLC3.
      2. Turn the power switch on (IG).
      3. Turn the Techstream on.
      4. Enter the following menus: Powertrain / Engine / Data List / Intake Manifold Absolute Pressure.

        Powertrain > Engine > Data List 

        Tester Display
        Intake Manifold Absolute Pressure
      5. Read the E.F.I. vacuum sensor value.

        OK

        Same value as the actual atmospheric pressure

        HINT: 

        • Standard atmospheric pressure is 101 kPa (abs) [758 mmHg (abs)].
        • For every 100 m (328 ft.) increase in altitude, pressure drops by 1 kPa (7.5 mmHg).
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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