Caution / Notice / Hint
WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.
Refer to VEHICLE CONTROL HISTORY (RoB) [12/2023 - ]
(Select Powertrain in Health Check and then check the time stamp data.)
- If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
HINT:
- By using the Control the EGR Step Position Active Test, the operation of the EGR valve can be checked.
- If the EGR valve is normal and is opened using the Active Test, the Data List value changes as follows.
Data List Item Change in Data List when Number of Steps is Increased Using Control the EGR Step Position Active Test Engine Speed Idle becomes rough Intake Manifold Absolute Pressure Pressure rises