Lexus IS250 · Service Manual ENGINE

INSTALLATION

Removal / installation


1. INSTALL STARTER ASSEMBLY

  1. A094953E08
    Install the starter with the 2 bolts.

    Torque:
    58 N*m{ 591 kgf*cm , 43 ft.*lbf }

  1. Connect the wire harness to terminal 30 and install the nut, and then attach the terminal cap.

    Torque:
    9.8 N*m{ 100 kgf*cm , 87 in.*lbf }

  1. Connect the terminal 50 connector to the starter assembly.


2. INSTALL EXHAUST MANIFOLD SUB-ASSEMBLY LH

  1. A096590E02
    Install a new gasket and the exhaust manifold with 6 new nuts.

    Torque:
    21 N*m{ 214 kgf*cm , 15 ft.*lbf }

  1. A121867
    Connect the air fuel ratio sensor (for sensor 1) connector.

  1. A122255E01
    Install the engine wire bracket with the bolt (A).

    Torque:
    10 N*m{ 102 kgf*cm , 7 ft.*lbf }

  1. Install the ground cable with the 2 bolts (B, C).

    Torque:
    Bolt (B):
    10 N*m{ 102 kgf*cm , 7 ft.*lbf }
    Bolt (C):
    13 N*m{ 133 kgf*cm , 10 ft.*lbf }


3. INSTALL ENGINE ROOM NO. 3 RELAY BLOCK (for LHD)

  1. A123778E01
    Install the engine room No. 3 relay block with the bolt and nut.

    Torque:
    12.5 N*m{ 127 kgf*cm , 9 ft.*lbf }


4. INSTALL ENGINE ROOM RELAY BLOCK ASSEMBLY (for RHD)

5. REMOVE NO. 4 ENGINE WIRE (for RHD)

6. INSTALL NO. 1 RELAY BLOCK COVER (for RHD)

7. INSTALL BATTERY TRAY (for RHD)

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

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


8. INSTALL POWER STEERING ECU ASSEMBLY (for RHD)

  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.


9. INSTALL BATTERY (for RHD)

  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 }


10. INSTALL NO. 1 EXHAUST PIPE SUPPORT BRACKET SUB-ASSEMBLY (for Automatic Transmission)

  1. C108503E02
    Install the exhaust pipe No. 1 support bracket sub-assembly with the 2 bolts.

    Torque:
    43 N*m{ 438 kgf*cm , 32 ft.*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. INSTALL ENGINE ROOM SIDE COVER LH

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


16. INSTALL COOL AIR INTAKE DUCT SEAL

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


17. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL

Torque:
5.4 N*m{ 55 kgf*cm , 48 in.*lbf }


18. CHECK FOR EXHAUST LEAKS

19. PERFORM INITIALIZATION

  1. Perform initialization procedure (Click here).

    HINT:
    Some vehicle systems require initialization after reconnecting the negative battery cable.

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