Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Dtc Check / Clear

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Engine & Hybrid System / 2gr-fks (engine Control) / Sfi System / Dtc Check / Clear

DTC CHECK / CLEAR

NOTICE:

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 Techstream. The Techstream 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 ECM 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 Techstream 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 Techstream (or by disconnecting the cable from the negative (-) battery terminal), permanent DTCs can be cleared when the system is determined to be normal for the relevant DTCs and then the universal trip is performed. 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 2 trips. (Normal judgment does not have to be performed in 2 consecutive trip, but normal judgment should occur in the latest trip.) (not for misfire and fuel system DTCs)
    • No malfunctions are detected.
2 Trip Detection Examples

Pending DTC

Store condition

Malfunction detected

Clear condition

System determined to be normal

or

DTCs cleared using Techstream

or

Cable disconnected from negative (-) battery terminal

Confirmed DTC

Store condition

Malfunction detected (2nd trip)

Clear condition

No malfunctions in 40 driving cycles

or

DTCs cleared using Techstream

or

Cable disconnected from negative (-) battery terminal

Permanent DTC

Store condition

Malfunction detected (2nd trip)

Clear condition

Engine switch turned on (IG) after normal judgment obtained in 3 consecutive driving cycles

or

After DTCs cleared using Techstream or cable disconnected from negative (-) battery terminal, universal trip performed and normal judgment obtained for 2 trips (not for misfire and fuel system DTCs)

or

After DTCs cleared using Techstream or cable disconnected from negative (-) battery terminal, malfunction not detected when universal trip driving performed (misfire and fuel system DTCs)

MIL

ON

Malfunction detected (2nd trip)

OFF

Engine switch turned on (IG) after normal judgment obtained in 3 consecutive driving cycles

or

DTCs cleared using Techstream

or

Cable disconnected from negative (-) battery terminal

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 DTCs are misfire or fuel system DTCs.

CHECK DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

(e) Check the DTC(s) and freeze frame data, and then write them down.

Techstream Display

Description

Test Failed

Shows the malfunction judgment results during the current trip.

Pending

Shows the malfunction judgment results up to now. (Indicates the possibility of a malfunction when no DTC is confirmed.)

Confirmed

Shows the DTCs confirmed up to now. (The number of current trips differs for each DTC.)

(f) Check the details of the DTC(s).

Click here

CLEAR DTC (Pending and Confirmed DTC)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Clear the DTCs.

Powertrain > Engine > Clear DTCs

CLEAR DTC (Pending and Confirmed DTC without using Techstream)

(a) Perform either of the following operations:

NOTICE:

After turning engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

Click here

(1) Disconnect the cable from the negative (-) battery terminal for more than 1 minute.

(2) Remove the EFI-MAIN and ETCS fuses from the engine room relay block and junction block assembly located inside the engine compartment for more than 1 minute.

OUTLINE
  • After clearing current DTCs using the Techstream (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 are met:
    • There is a history that universal trip driving was performed.
    • The vehicle has been judged as normal for 2 trips. (Normal judgment does not have to be performed in 2 consecutive trip, but normal judgment should occur in the latest trip.) (not for misfire and fuel system DTCs)
    • No malfunctions are detected.

CLEAR PERMANENT DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

HINT:

If "PERMANENT" in the top right of the screen displays "YES", permanent DTCs are stored.

(e) Select the "Generic" tab.

(f) Check if permanent DTCs are stored.

HINT:

If permanent DTCs are not output, it is not necessary to continue this procedure.

(g) Clear the DTCs.

Powertrain > Engine > Clear DTCs

NOTICE:

Do not clear the DTCs or disconnect the cable from the battery terminal after performing this step.

(h) 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.

  1. Start the engine 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.

    CAUTION:

    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 engine started.

(i) Turn the engine switch off and wait for 2 minutes or more.

(j) Turn the engine switch on (IG).

(k) Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

(l) Check that the permanent DTCs have been cleared.

HINT:

The permanent DTCs are cleared when the universal trip is completed.

(m) Perform the normal judgment procedure in the respective confirmation driving pattern of each output DTC.

HINT:

  • Confirmation driving patterns do not need to be performed for misfire and fuel system DTCs.
  • Do not turn the engine switch off by mistake during this step.

(n) Start the engine and wait for 5 seconds or more.

(o) Turn the engine switch off and wait for 2 minutes or more.

(p) Turn the engine switch on (IG).

(q) Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

(r) Check that the permanent DTCs have been cleared.

HINT:

If permanent DTCs are not output, it is not necessary to continue this procedure.

(s) Perform the normal judgment procedure in the respective confirmation driving pattern of each output DTC.

HINT:

  • Confirmation driving patterns do not need to be performed for misfire and fuel system DTCs.
  • Do not turn the engine switch off by mistake during this step.

(t) Start the engine and wait for 5 seconds or more.

(u) Turn the engine switch off and wait for 2 minutes or more.

(v) Turn the engine switch on (IG).

(w) Enter the following menus: Powertrain / Engine / Trouble Codes.

Powertrain > Engine > Trouble Codes

(x) Check that the permanent DTCs have been cleared.

    Diagnosis System
    DIAGNOSIS SYSTEM DESCRIPTION When troubleshooting OBD II (On-Board Diagnostics) vehicles, the Techstream (complying with SAE J1978) must be connected to the DLC3 (Data Link Connector 3) of the vehicl ...

    Freeze Frame Data
    FREEZE FRAME DATA DESCRIPTION The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in deter ...

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