Lexus NX manuals

Lexus NX: Initialization

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (engine Control) / Sfi System / Initialization

INITIALIZATION

Inspection After Repair

Perform learning value reset and idle learning after replacing or servicing parts related to engine operation. Details on procedures required are indicated by an asterisk and a number, and are explained in detail following the table.

Part Replaced

Engine Operation

Learning Value Reset*1

Idle Learning*2
  • Throttle body with motor assembly*3
  • Cleaning the deposits from the throttle body with motor assembly*3

-

○

○

Engine assembly

-

○

○
  • Cylinder head sub-assembly
  • Camshaft (for intake or exhaust camshaft)
  • Camshaft timing gear assembly
  • Piston or piston ring
  • Mass air flow meter sub-assembly
  • Fuel injector assembly
  • Fuel pump
  • Air fuel ratio sensor
  • Heated oxygen sensor
  • Engine coolant temperature sensor
  • Spark plug
  • Ignition coil assembly
  • EGR valve assembly
  • Air leaks from intake system
  • Gas leaks from exhaust system

Confirm the following:

Perform learning value reset and idle learning when one or more of the following conditions is met.

  1. A DTC was output before component replacement.
  2. An air fuel ratio learned value (one of A/F Learn Value Idle #1, A/F Learn Value Low #1, A/F Learn Value Mid1 #1, A/F Learn Value Mid2 #1 or A/F Learn Value High #1) displayed in the Data List was higher than +/- 20% before component replacement.
  3. Starting failure, rough idle, or engine stalls after component replacement.

○

○

The items in the list above do not apply.

-

-

Knock control sensor*4

-

-

-
  • ○: Necessary.
  • -: Unnecessary.

NOTICE:

Engine learned values cannot be reset by disconnecting the auxiliary battery negative (-) terminal or removing the EFI-MAIN NO. 1 and ETCS fuses.

  • *1: Learning Value Reset
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Utility / Learning Value Reset.
    5. Confirm the following conditions as instructed on the screen.
      • - Power switch on (IG)
      • - Engine stopped
      • - Auxiliary battery voltage is higher than 9 V
    6. After confirming, select "Next" to initialize the learned value.

      HINT:

      If a message indicating learned value initialization failure is displayed on the screen, confirm the execution conditions, and perform Learning Value Reset again.

    7. After the completion of learned value initialization, confirm the air fuel ratio learned values (A/F Learn Value Idle #1, A/F Learn Value Low #1, A/F Learn Value Mid1 #1, A/F Learn Value Mid2 #1 and A/F Learn Value High #1) in the Data List.

      If 0 is displayed for all the air fuel ratio learned values, initialization has completed correctly.

      If a value other than 0 is displayed for one of the air fuel ratio learned values, perform initialization again. After initialization, confirm the air fuel ratio learned values. If a value other than 0 is displayed, replace the ECM.

  • *2: Idle Learning
    1. Turn the power switch off and wait for at least 30 seconds.
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Turn the Techstream on.
    5. Put the engine in inspection mode (maintenance mode).

      Click here

    6. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.
    7. Start the engine and warm it up until the engine coolant temperature is 70°C (158°F) or higher.
    8. Turn the power switch off, and then on (READY).
    9. With the shift lever in P, lightly depress the accelerator pedal to start the engine.
    10. Wait until the engine stops.

      HINT:

      The engine normally stops within 1 minute. However, when the HV battery SOC is low, the engine may remain running for approximately 3 minutes.

    11. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / ISC Learning.
    12. Confirm that "Compl" is displayed on the Techstream screen.
    13. Put the engine in inspection mode (maintenance mode).

      Click here

    14. Start the engine.
    15. Confirm that the idle speed is within the specified range.

      Standard:

      Engine Idle Speed

      950 to 1050 rpm

      HINT:

      • Be sure to perform this step with all accessories off.
      • Make sure that the shift lever is in P.
  • *3: Perform memory reset and idle learning after replacing the throttle body with motor assembly or cleaning deposits from the throttle body with motor assembly.

    After that, check the idle speed. If the value is out of the specified range, perform the procedure below.

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    HINT:

    History information for driving and stopping is necessary to update idle learning.

    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Put the engine in inspection mode (maintenance mode).

      Click here

    5. Start the engine.
    6. Warm up the engine (engine coolant temperature is 80°C (176°F) or higher, air conditioning and all accessories are off) [A].
    7. With the engine running, drive the vehicle at 10 km/h (6 mph) or more [B].

      HINT:

      If the engine stops, further depress the accelerator pedal to restart the engine.

    8. Idle the engine for 20 seconds or more [C].
    9. Repeat steps [B] and [C], and check that the idle speed is within the specified range [D].

      Standard:

      Engine Idle Speed

      950 to 1050 rpm

      HINT:

      • Be sure to perform this step with all accessories off.
      • Make sure that the shift lever is in P.
      • If the idle speed is still out of the specified range, repeat steps [B] and [C] until the idle speed is within the specified range [E].
  • *4: Drive the vehicle for a short while after replacing the knock control sensor, and check if knocking occurs. If knocking occurs, drive the vehicle until knocking stops.

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