Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Engine Coolant Temperature / Intake Air Temperature Signal Compare Failure (P011B62)

HINT:

• Waiting is required to prevent the temperature of the engine from affecting the readings. If the engine has been operated recently, it is not possible to accurately compare the readings.

• For diagnosis, in order to duplicate the detection conditions of the DTC, it is necessary to park the vehicle for 7 hours. Parking the vehicle for 7 hours ensures that the actual temperature of the engine coolant temperature and intake air temperature (for mass air flow meter sub-assembly) are very similar. When the vehicle has been parked for less than 7 hours, differences in the readings may exist, but this does not necessarily indicate a fault.

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.

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

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1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) [A].
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.
6. With the engine stopped, leave the vehicle as is for 7.5 hours or more [B].
7. Turn the engine switch on (IG).
8. Turn the Techstream on.
9. Start the engine and wait 80 seconds or more [C].
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.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Input the DTC: P011B62.
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 is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system is malfunctioning.
    • If the judgment result is INCOMPLETE, perform steps [B] through [D] again.
    • [B] 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.

HINT:

• Temperature readings on the outside temperature gauge of the vehicle (if equipped) are not suitable for comparing to the intake air temperature reading. The outside temperature gauge has a significant delay built in to prevent swings in the temperature display. Use an accurate thermometer to determine the outside air temperature.
• Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

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HINT:

• If the result is not as specified, check that there are no heat sources such as a block heater in the engine compartment.
• Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

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Engine Coolant Temperature Sensor 1 Circuit Short to Battery or Open (P011515)

DESCRIPTION Refer to DTC P011511. Click here HINT: When DTC P011515 is stored, the ECM enters fail-safe mode. During fail-safe mode, the engine coolant temperature is estimated to be 80°C (176°F) ...

Engine Coolant Temperature Sensor 1 Signal Stuck in Range (P01152A)

DESCRIPTION Refer to DTC P011511. Click here DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note P01152A Engine Coolant Temperature Sensor 1 Signal Stuck ...

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