VEHICLE CONTROL HISTORY (RoB) [03/2024 - ]

WARNING: This page is about a different car, the 2025 Lexus NX 350, 2024 Lexus NX 350, 2023 Lexus NX 350, and 2022 Lexus NX 350. However, it is still accessible from the selected car via links, so may be relevant.

DESCRIPTION
- Vehicle Control History is a function that captures and stores ECU data when triggered by specific vehicle behavior.
- If the customer states that the engine stalled or will not start, it may be possible to diagnose the cause of the malfunction by checking the vehicle history information and Freeze Frame Data.
- The number of possible stored Freeze Frame Data sets, whether multi Freeze Frame Data is available, the number of freeze frame points, Freeze Frame Data items, the ECU internal range, etc., is different depending on the stored group.
- The stored data items for Vehicle Control History Freeze Frame Data are different depending on the stored group. When the value of a data item does not change across all points, only the value of the detection point will be displayed. The contents of the Freeze Frame Data is almost the same as that of the Data List.
  Refer to DATA LIST / ACTIVE TEST [03/2024 - ]
PRECAUTIONS
- As Vehicle Control History may be overwritten whenever the trigger conditions are met, make sure to save Vehicle Control History before performing any inspections.
- As Vehicle Control History may be stored when performing an Active Test, learning, etc., make sure to clear the Vehicle Control History before returning the vehicle to the customer.

CHECK VEHICLE CONTROL HISTORY (SFI SYSTEM)

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.

Enter the following menus: Powertrain / Engine / Utility / Vehicle Control History (RoB).

Powertrain > Engine > Utility

Tester Display
Vehicle Control History (RoB)

HINT:

It is also possible to display Vehicle Control History during the Health Check, if "Store All Data" is selected.

VEHICLE CONTROL HISTORY ITEM

Code	Item	Trigger Description	Stored Group	Reference Inspection Procedure	Link
X0800	Engine Stall	Detection Condition (Engine Stall) Prerequisite Conditions: The engine is running (after engine is judged to be difficult to start) Detection Conditions: The engine speed is decreases to 200 rpm or less, or stops Duration: 0.5 seconds or more	08	Flow chart [Engine Stalls] step 3	Refer to Engine Stalls [11/2021 - ]
X0800	Engine Stall	The engine stalled due to factors other than the operation of the ignition switch	08	Flow chart [Engine Stalls] step 3	Refer to Engine Stalls [11/2021 - ]
X0803	Engine Stall (Compression Leakage)	It is judged that the engine stalled due to compression leakage	08	Flow chart [Engine Stalls] step 3	Refer to Engine Stalls [11/2021 - ]
X0810	Engine Difficult to Start (Engine Starting Time Long)	Detection Condition (Engine Starting Time Long) Prerequisite Conditions: STA signal is ON Detection Conditions: The engine speed is less than 500 rpm for a long period of time (the starting time is long or the engine does not start) Duration: Refer to Engine Difficult to Start Duration Judgment Region illustration	09	Flow chart [Engine Difficult to Start] step 3	Refer to Engine Difficult to Start [11/2021 - ]
X0810	Engine Difficult to Start (Engine Starting Time Long)	The engine speed decreases or the engine stalls immediately after starting	09	Flow chart [Engine Difficult to Start] step 3	Refer to Engine Difficult to Start [11/2021 - ]
X0811	Engine Difficult to Start (Engine Stall Immediately After Starting)	Detection Condition (Engine Stall Immediately After Starting) Prerequisite Conditions: Within 2 seconds after the engine has started (engine speed is 500 rpm or more) and the engine coolant temperature is -35°C (-31°F) or more Detection Conditions: The engine speed decreases to 200 rpm or less (immediately after starting, the engine speed decreases or the engine stalls) Duration: -	09	Flow chart [Engine Difficult to Start] step 3	Refer to Engine Difficult to Start [11/2021 - ]
X0811		The engine speed decreases or the engine stalls immediately after starting	09	Flow chart [Engine Difficult to Start] step 3	Refer to Engine Difficult to Start [11/2021 - ]
X0812	Engine Difficult to Start (Immobiliser)	Engine difficult to start due to immobiliser	09	Flow chart [Engine Difficult to Start] step 3	Refer to Engine Difficult to Start [11/2021 - ]
X0821	Rough Idle #1	Detection Condition (Rough Idle) Prerequisite Conditions: The engine is idling with the vehicle is stopped and the accelerator pedal is fully released Detection Conditions: It is judged that combustion is unstable due to the instantaneous change in engine speed for each cylinder Duration: Depending on the combustion status, between 2 and 10 seconds	03	Flow chart [Rough Idling] step 3	Refer to Rough Idling [11/2021 - ]
X0821	Rough Idle #1	Idling is rough due to unstable combustion in the No. 1 cylinder	03	Flow chart [Rough Idling] step 3	Refer to Rough Idling [11/2021 - ]
X0822	Rough Idle #2	Idling is rough due to unstable combustion in the No. 2 cylinder	03	Flow chart [Rough Idling] step 3	Refer to Rough Idling [11/2021 - ]
X0823	Rough Idle #3	Idling is rough due to unstable combustion in the No. 3 cylinder	03	Flow chart [Rough Idling] step 3	Refer to Rough Idling [11/2021 - ]
X0824	Rough Idle #4	Idling is rough due to unstable combustion in the No. 4 cylinder	03	Flow chart [Rough Idling] step 3	Refer to Rough Idling [11/2021 - ]
X082A	Rough Idle (Plural Cylinders)	Idling is rough due to multiple cylinders As more than one cylinder is affected, the fuel system, etc. is suspected	03	Flow chart [Rough Idling] step 3	Refer to Rough Idling [11/2021 - ]
X082D	Rough Idle (Compression Leakage)	Idling is judged to be rough due to compression leakage	03	Flow chart [Rough Idling] step 3	Refer to Rough Idling [11/2021 - ]
X082E	Rough Idle (Low Frequency)	Slight rough idle symptoms are detected 3 times in 10 trips HINT: As the rough idle symptoms are slight, if rough idle codes other than rough idle (low frequency) code X082E are stored, this code will not be stored.	03	Flow chart [Rough Idling] step 3	Refer to Rough Idling [11/2021 - ]
X0844	Engine Lack of Power	Detection Condition (Engine Lack of Power) Prerequisite Conditions: All of the following conditions are met The accelerator opening angle 80% or more. The engine speed is 1900 rpm or more. The intake air temperature is 60°C (140°F) or less. The atmospheric pressure is 61 kPa (abs) [8.70 psi (abs)] or higher. The STP signal is off. The STA signal is off. Shift state is not in P or N. Detects a condition where the output torque is insufficient approximately 41% or more relative to the requested torque (divided value of the output torque is approximately 0.59 less than the requested torque) Duration: 2.8 seconds or more	04	Flowchart [Lack of Power] step 3	Refer to Lack of Power [11/2021 - ]
X0845	Engine Lack of Power (Bad Fuel Condition)	Engine output is insufficient due to bad quality fuel (Fuel quality is bad due to fuel aging degradation, water intrusion or fuel additive)	04	Flowchart [Lack of Power] step 3	Refer to Lack of Power [11/2021 - ]
X0850	Engine Oil Pressure Low	The engine oil pressure is low	05	-	-
X0851	Engine Coolant Temperature High	The engine coolant temperature is high (overheating)	05	-	-
X0852	Engine RPM High	The engine speed is high (over revving)	05	-	-
X0854	Engine Coolant Temperature High (Low Voltage)	The engine coolant temperature is high (overheating) due to a low engine water pump assembly voltage causing the engine water pump assembly to stop	05	-	-
X263E	Suspension Specification Information Learning Incomplete	Suspension specification information is unlearned	-	Perform Switch Specification Information	Refer to INITIALIZATION [11/2021 - ]
XF01B	ECU Security Key Not Registered	ECU security key has not been updated	-	-	Refer to UPDATE ECU SECURITY KEY [11/2021 - ]

Engine Difficult to Start Duration Judgment Region (Engine Starting Time Long) (X0810)