Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Intake Air Temperature Sensor 1 Bank 1 Signal Stuck in Range (P01102A)

HINT:

• After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

  Click here

• When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

  Click here

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
5. Turn the engine switch off and wait for at least 30 seconds.
6. Turn the engine switch on (IG) [A].
7. Turn the Techstream on.
8. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
9. Idle the engine for 5 minutes or more [C].

   HINT:

   During steps [A] through [C], if the change in the intake air temperature is less than 1°C (1.8°F), the intake air temperature sensor (mass air flow meter sub-assembly) is malfunctioning. It is not necessary to continue this procedure.

10. Enter the following menus: Powertrain / Engine / Trouble Codes [D].
11. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
    • [A] to [D]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Input the DTC: P01102A.
14. Check the DTC judgment result.

    Techstream Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE, perform steps [E] and [F].
15. Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more [E].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

16. Check the DTC judgment result again [F].

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system is malfunctioning.
    • If the judgment result is INCOMPLETE, perform steps [E] through [F] again.
    • [A] to [F]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

HINT:

• If any DTCs other than P01102A are output, troubleshoot those DTCs first.
• Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

  Click here

Intake Air Temperature Sensor 1 Bank 1 Circuit Short to Battery or Open (P011015)

DESCRIPTION Refer to DTC P011011. Click here HINT: When DTC P011015 is stored, the ECM enters fail-safe mode. During fail-safe mode, the intake air temperature is estimated to be 20°C (68°F) by th ...

Engine Coolant Temperature Sensor 1 Circuit Short to Ground (P011511)

DESCRIPTION A thermistor, whose resistance value varies according to the engine coolant temperature, is built into the engine coolant temperature sensor. The structure of the sensor and its connection ...

Other materials:

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Smart Access System With Push-button Start (for Start Function): Operation Check
OPERATION CHECK NOTICE: Make sure that the smart access system with push-button start (for Start Function) has not been canceled before performing this inspection. Click here OPERATION DESCRIPTION (a) Power source state when a door is unlocked via a wireless unlock or entry unlock operation: HINT: ...

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Navigation System: MOST Communication Malfunction (B15D0)
DESCRIPTION Navigation system components communicate with each other via MOST communication. If a line short or short to ground occurs in a MOST communication line, communication will not be possible and the navigation system will not operate normally. After the engine switch is turned on (ACC), if ...