Lexus IS250 · Service Manual ENGINE

INSTALLATION

Removal / installation


1. INSTALL AIR FUEL RATIO SENSOR (for Bank 2 Sensor 1)

  1. A121436
    Using SST, install the sensor to the exhaust manifold LH.
    SST
    09224-00010  

    Torque:
    40 N*m{ 408 kgf*cm , 30 ft.*lbf }

    HINT:
    Use a torque wrench with a fulcrum length of 300 mm (11.81 in.).

  1. Connect the sensor connector.


2. INSTALL AIR FUEL RATIO SENSOR (for Bank 1 Sensor 1)

  1. A125023
    Using SST, install the sensor to the exhaust manifold RH.
    SST
    09224-00010  

    Torque:
    40 N*m{ 408 kgf*cm , 30 ft.*lbf }

    HINT:
    Use a torque wrench with a fulcrum length of 300 mm (11.81 in.).

  1. Connect the sensor connector.


3. INSTALL NO. 3 RELAY BLOCK ASSEMBLY

4. INSTALL EXHAUST MANIFOLD SUB-ASSEMBLY LH

  1. A102843E01
    Install the exhaust manifold to the gasket shown in the illustration.

  1. A102847E01
    Install the exhaust manifold sub-assembly LH with the 6 nuts.

    Torque:
    21 N*m{ 214 kgf*cm , 16 ft.*lbf }


5. INSTALL ENGINE ROOM RELAY BLOCK ASSEMBLY

6. INSTALL NO. 4 ENGINE WIRE

7. INSTALL NO. 1 RELAY BLOCK COVER

8. INSTALL BATTERY TRAY

  1. A107680
    Install the battery tray with the 2 bolts.

    Torque:
    5.0 N*m{ 51 kgf*cm , 44 in.*lbf }


9. INSTALL POWER STEERING ECT ASSEMBLY

  1. C115528E01
    Connect connector (c) to the power steering ECU assembly.

  1. Connect 2 power steering ECU assembly connectors (a) and (b) and securely lock the connectors.

  1. C115526E01
    Install the power steering ECU assembly to the battery tray with the 3 bolts.

    Torque:
    5.0 N*m{ 51 kgf*cm , 44 in.*lbf }

  1. Install the No. 1 battery tray support.


10. INSTALL BATTERY

  1. Install the battery.

  1. Install the battery insulator.

  1. Install the battery clamp with the 2 nuts.

    Torque:
    2.9 N*m{ 30 kgf*cm , 26 in.*lbf }

  1. Connect the positive (+) battery cable to the battery.

    Torque:
    5.6 N*m{ 57 kgf*cm , 50 in.*lbf }

  1. Connect the negative (-) battery cable to the battery.

    Torque:
    5.6 N*m{ 57 kgf*cm , 50 in.*lbf }


11. INSTALL FRONT EXHAUST PIPE ASSEMBLY

  1. A077857
    Using a vernier caliper, measure the free length of the compression springs.

    Minimum length:
    38.5 mm (1.516 in.)

    If the free length is less than the minimum, replace the compression spring.

  1. A109513E09
    Install a new gasket to the rear end of the front exhaust pipe.

    NOTICE:
    1. Be careful with the installation direction of the gasket.
    1. Do not reuse the gasket.
    1. To ensure a proper seal, do not use the tail exhaust pipe to force the gasket onto the front exhaust pipe.

      HINT:
      Using a plastic hammer, uniformly strike the gasket so that the gasket and front exhaust pipe are properly fit.

  1. Install 3 new gaskets and front exhaust pipe assembly.

    CAUTION:
    Do not reuse the gaskets.

  1. A125008
    Install the 2 bolts and 2 compression springs.

    Torque:
    43 N*m{ 438 kgf*cm , 32 ft.*lbf }

  1. A127822E01
    Install 4 new nuts and 4 bolts.

    Torque:
    62 N*m{ 632 kgf*cm , 46 ft.*lbf }

    NOTICE:
    Do not reuse the nuts.


12. INSTALL HEATED OXYGEN SENSOR

  1. A119092
    Before installing the heated oxygen sensors, twist the sensor wires counterclockwise 4 turns.

  1. A123663E02
    Using the SST, install the heated oxygen sensors to the front exhaust pipe.
    SST
    09224-00010  

    Torque:
    44 N*m{ 449 kgf*cm , 33 ft.*lbf }

  1. After installing the sensors, check that the sensor wires are not twisted.
    If the sensor wires are twisted, reinstall them.

  1. A120539E05
    Install the grommets of the heated oxygen sensors.


13. INSTALL FRONT CENTER FLOOR BRACE

  1. C104834
    Install the front center floor brace with the 4 bolts.

    Torque:
    7.4 N*m{ 75 kgf*cm , 65 in.*lbf }


14. INSTALL REAR NO. 1 FLOOR PANEL BRACE

  1. A121036
    Install the rear No. 1 floor panel brace with the 4 bolts.

    Torque:
    19 N*m{ 194 kgf*cm , 14 ft.*lbf }


15. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL

16. PERFORM INITIALIZATION

  1. Perform initialization (Click here).

    NOTICE:
    Certain systems need to be initialized after reconnecting the cable to the negative (-) battery terminal.


17. INSTALL ENGINE ROOM SIDE COVER LH

  1. A123702E01
    Install the side cover with the 5 clips.


18. INSTALL ENGINE ROOM COVER SIDE RH

  1. A123703E01
    Install the side cover with the 2 clips.


19. INSTALL COOL AIR INTAKE DUCT SEAL

  1. A127530
    Install the intake duct seal with the 11 clips.


20. EXHAUST GAS LEAKAGE
If exhaust gas is leaking, tighten the related parts to stop the leak. Replace damaged parts as necessary.
← REMOVALCOMPONENTS →