Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: ECM/PCM Engine Off Timer Performance Signal Invalid (P261029,P261093)

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).
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. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].
7. Turn the engine switch off and wait for at least 15 seconds [B].
8. Start the engine [C].
9. Stop the engine and leave the vehicle for 60 minutes or more [D].
10. Turn the engine switch on (IG).
11. Turn the Techstream on.
12. Enter the following menus: Powertrain / Engine / Trouble Codes [E].
13. 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.
14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
15. Input the DTC: P261029 or P261093.
16. 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 has a malfunction.
    • [A] to [E]: 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:

• DTC P261029 or P261093 is set if an internal ECM problem is detected. Diagnostic procedures are not required. ECM replacement is required.
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Evaporative Emission System Switching Valve Control Circuit Actuator Stuck Off (P24187F)

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Lost Communication with TCM Missing Message (U010187)

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