DTC Check / Clear [11/2021 - 03/2023]

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.

NOTE:

When the diagnosis system is changed from normal mode to check mode or vice versa, all DTCs and freeze frame data recorded in normal mode are cleared. Before changing modes, always check and make a note of DTCs and freeze frame data.

HINT:

DTCs which are stored in the ECM can be displayed on the GTS. The GTS can display confirmed, pending and permanent DTCs.
If a malfunction is detected during the current driving cycle, confirmed and permanent DTCs are stored.
Some DTCs are not stored if the ECM does not detect the same malfunction again during a second consecutive driving cycle. However, such malfunctions, detected during only one driving cycle, are stored as pending DTCs.
Confirmed and pending DTCs can be cleared by using the GTS or by disconnecting the cable from the negative (-) battery terminal. However, permanent DTCs cannot be cleared using either of these two methods.
After clearing confirmed DTCs using the GTS (or by disconnecting the cable from the negative (-) battery terminal), permanent DTCs can be cleared when the universal trip is performed and then the system is determined to be normal for the relevant DTCs. The driving pattern to obtain a normal judgment is described under the "Confirmation Driving Pattern" for the respective DTC.
To clear permanent DTCs, all of the following conditions must be met:
- A universal trip has been performed.
- The vehicle has been judged as normal for 2 trips. (Normal judgment does not have to be performed in 2 consecutive trips, but normal judgment should have occurred in the latest trip.)
- No malfunctions are detected.

2 TRIP DETECTION EXAMPLES

Pending DTC	Store condition	Malfunction detected
Pending DTC	Clear condition	System determined to be normal or DTCs cleared using GTS or Cable disconnected from negative (-) battery terminal
Confirmed DTC	Store condition	Malfunction detected (2nd trip)
Confirmed DTC	Clear condition	No malfunctions in 40 driving cycles or DTCs cleared using GTS or Cable disconnected from negative (-) battery terminal
Permanent DTC	Store condition	Malfunction detected (2nd trip)
Permanent DTC	Clear condition	Ignition switch turned to ON after no malfunction is detected in 3 consecutive driving cycles or After DTCs cleared using GTS or cable disconnected from negative (-) battery terminal, universal trip performed and normal judgment obtained for 2 trips
MIL	ON	Malfunction detected (2nd trip)
MIL	OFF	Ignition switch turned to ON after no malfunction is detected in 3 consecutive driving cycles or DTCs cleared using GTS or Cable disconnected from negative (-) battery terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CLEAR PERMANENT DTC

OUTLINE

After clearing confirmed DTCs using the GTS (or by disconnecting the cable from the negative (-) battery terminal), permanent DTCs can be cleared when the universal trip is performed and then the system is determined to be normal for the relevant DTCs. The driving pattern to obtain a normal judgment is described under Confirmation Driving Pattern for the respective DTC.

To clear permanent DTCs, all of the following conditions must be met:

A universal trip has been performed.
The vehicle has been judged as normal for 2 trips. (Normal judgment does not have to be performed in 2 consecutive trips, but normal judgment should have occurred in the latest trip.)

No malfunctions are detected.

Enter the following menus: Powertrain / Transmission / Trouble Codes.
Powertrain > Transmission > Trouble Codes

HINT:

If "YES" is displayed for the value of "PERMANENT" at the top right of the GTS screen, permanent DTCs are stored.
Select the "Generic" tab.
Check if permanent DTCs are stored.
HINT:

If permanent DTCs are not output, it is not necessary to continue this procedure.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Powertrain > Transmission > Clear DTCs

NOTE:
Do not clear the DTCs or disconnect the cable from the negative (-) battery terminal after performing this step.

Perform the universal trip.

HINT:

The universal trip driving pattern and normal judgment procedure can be performed consecutively in the same driving cycle.

Start the engine and wait for 30 seconds or more.
Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more.
WARNING:
When performing a driving pattern, obey all speed limits and traffic laws.

HINT:

It is possible to complete the drive pattern even if the vehicle decelerates to less than 40 km/h (25 mph) during the driving cycle provided that the vehicle is driven at 40 km/h (25 mph) or more for a total of 5 minutes.
Allow 10 minutes or more to elapse from the time the engine started.

Turn the ignition switch off and wait for 2 minutes or more.
Perform the normal judgment procedure in the respective confirmation driving pattern of each output DTC.
HINT:

Do not turn the ignition switch off by mistake during this step.
With the ignition switch ON, wait for 5 seconds or more.
Turn the ignition switch off and wait for 2 minutes or more.
Turn the ignition switch to ON.
Enter the following menus: Powertrain / Transmission / Trouble Codes.
Powertrain > Transmission > Trouble Codes
Check that the permanent DTCs have been cleared.
HINT:

If permanent DTCs are not output, it is not necessary to continue this procedure.
Perform the normal judgment procedure in the respective confirmation driving pattern of each output DTC.
HINT:

Do not turn the ignition switch off by mistake during this step.
With the ignition switch ON, wait for 5 seconds or more.
Turn the ignition switch off and wait for 2 minutes or more.
Turn the ignition switch to ON.
Enter the following menus: Powertrain / Transmission / Trouble Codes.
Powertrain > Transmission > Trouble Codes
Check that the permanent DTCs have been cleared.
HINT:

Permanent DTCs will be cleared if a normal judgment is obtained during 3 consecutive driving cycles with the MIL illuminated.