DTC Check / Clear [09/2023 - ]

WARNING: This page is about a different car, the 2024 Lexus TX 500h. 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 TCM can be displayed on the GTS. The GTS can display the 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 TCM does not detect the same malfunction again during a second consecutive driving cycle. However, such malfunctions, detected on only one occasion, are stored as pending DTCs.
Confirmed and pending DTCs can be cleared by using the GTS. However, permanent DTCs cannot be cleared using this method.
After clearing current DTCs using the GTS, 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 are met:
- There is a history that universal trip driving was performed.
- The vehicle has been judged as normal for 1 trip.
- No malfunctions are detected.

2 TRIP DETECTION LOGIC EXAMPLES

Pending DTC	Store condition	Malfunction detected
Pending DTC	Clear condition	System determined to be normal or DTCs cleared using GTS
Confirmed DTC	Store condition	Malfunction detected (2nd trip)
Confirmed DTC	Clear condition	No malfunctions in 40 driving cycles or DTCs cleared using GTS
Permanent DTC	Store condition	Malfunction detected (2nd trip)
Permanent DTC	Clear condition	Ignition switch turned to ON after normal judgment obtained in 3 consecutive driving cycles or After DTCs cleared using GTS, universal trip performed and normal judgment obtained for 1 trip
MIL	ON	Malfunction detected (2nd trip)
MIL	OFF	Ignition switch turned to ON after normal judgment obtained in 3 consecutive driving cycles or DTCs cleared using GTS

Fig 1: 2 Trip Detection Log Example (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: 2 Trip Detection Log Example (2 Of 2)

HINT:

Obtaining a normal judgment and performing a universal trip driving pattern can be done in the same driving cycle or in different driving cycles.
It is unnecessary to obtain a normal judgment if the output DTCs are misfire or fuel system DTCs.

CLEAR PERMANENT DTC
OUTLINE
1. After clearing current DTCs using the GTS, 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.
2. To clear permanent DTCs, all of the following conditions must be are met:
  - There is a history that universal trip driving was performed.
  - The vehicle has been judged as normal for 1trip.
  - No malfunctions are detected.
1. Connect the GTS to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the GTS on.
4. Enter the following menus: Powertrain / Transmission / Trouble Codes.
  Powertrain > Transmission > Trouble Codes
  
  HINT:
  
  If "PERMANENT" in the top right of the screen displays "YES", permanent DTCs are stored.
5. Select the "Generic" tab.
6. Check if permanent DTCs are stored.
  HINT:
  
  If permanent DTCs are not output, it is not necessary to continue this procedure.
7. Clear the DTCs.
  Powertrain > Transmission > Clear DTCs
  
  NOTE:
  Do not clear the DTCs after performing this step.
8. Perform the universal trip.
  HINT:
  
  The driving pattern to obtain a normal judgment and the universal trip driving can be performed consecutively in the same driving cycle.
  
  Fig 3: Universal Trip Driving Pattern (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Universal Trip Driving Pattern (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Turn the ignition switch to ON (READY) and wait for 30 seconds or more.
  2. 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.
  3. Allow 10 minutes or more to elapse from the time the ignition switch turned to ON (READY).
9. Turn the ignition switch off and wait for 2 minutes or more.
10. Turn the ignition switch to ON.
11. Enter the following menus: Powertrain / Transmission / Trouble Codes.
  Powertrain > Transmission > Trouble Codes
12. Check that the permanent DTCs have been cleared.
  HINT:
  
  If permanent DTCs are not output, it is not necessary to continue this procedure.
13. 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.
14. With the ignition switch ON (READY) wait for 5 seconds or more.
15. Turn the ignition switch off and wait for 2 minutes or more.
16. Turn the ignition switch to ON.
17. Enter the following menus: Powertrain / Transmission / Trouble Codes.
  Powertrain > Transmission > Trouble Codes
18. Check that the permanent DTCs have been cleared.