Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Lost Communication with ECM/PCM "A" Missing Message (U010087)

HINT:

• After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
• 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) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the engine switch off and wait for 2 minutes or more.
5. Turn the engine switch on (IG) and turn the Techstream on.
6. Wait for 2 seconds or more with the engine switch on (IG). [*1]

   HINT:

   [*1] : Normal judgment procedure.

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

7. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
8. Input the DTC: U010087.
9. 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
   N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

   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 or N/A, perform the normal judgment procedure again.

NOTICE:

• Perform the universal trip to clear permanent DTCs.

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• Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

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Pressure Control Solenoid "H" Circuit Open (P281613)

DESCRIPTION Changing gears is performed by the ECM turning the shift solenoid valves SL1, SL2, SL3, SL4 and SL5 on and off. If an open or short occurs in any of the shift solenoid valve circuits, the ...

Transmission Control Switch Circuit

DESCRIPTION The transmission control switch detects when the shift lever is moved to M. Moving the shift lever to "+" once selects the next higher gear, and moving the shift lever to "-" once selects ...

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