2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE

Ignition Coil And Spark Plug: Installation

  1. INSTALL SPARK PLUG 
    1. Using a 16 mm plug wrench, ins all the 8 spark plugs.

      Torque: 21 N*m (214 kgf*cm, 15 ft.*lbf) 

      Fig 1: Removing Spark Plugs
      G04943804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSTALL IGNITION COIL ASSEMBLY 
    1. Install the 8 ignition coils with the 8 bolts.
      NOTE: Do not damage the ignition coils when installing them.

      Torque: 9.0 N*m (92 kgf*cm, 80 in.*lbf) 

    2. Connect the 8 ignition coil connectors
      Fig 2: Locating Ignition Coils Bolts
      G05751957Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSTALL WIRE HARNESS CLAMP BRACKET 
    1. Install the wire harness clamp bracket with the bolt.

      Torque: 8.0 N*m (82 kgf*cm, 71 in.*lbf) 

    2. Install the wire harness clamp to the clamp bracket.
      Fig 3: Locating Wire Harness Clamp Bracket Bolts
      G05751956Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Install the No 7 engine room relay block with the 2 bolts and nut

      Torque: 8.0 N*m (82 kgf*cm, 71 in.*lbf) 

      Fig 4: Locating Wire Harness Clamp Bracket Bolts
      G05751955Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSTALL BATTERY TRAY 
    1. Install the battery tray with the 3 bolts.

      Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf) 

  5. INSTALL POWER STEERING ECU ASSEMBLY  (See INSTALLATION )
  6. INSTALL NO. 1 BATTERY TRAY SUPPORT 
  7. INSTALL BATTERY 
    1. Install the battery
    2. Install the battery insulator
      Fig 5: Identifying Battery Tray And Bolts
      G05751954Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Install the battery clamp with a nut.

      Torque: 2.9 N*m (30 kgf*cm, 26 in.*lbf) 

    4. Connect the cable to the positive (+) battery terminal.

      Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf) 

    5. Connect the 2 clamps.
      6. Fig 6: Identifying Battery Clamp And Battery Insulator
      G05752951Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSTALL AIR CLEANER CAP SUB ASSEMBLY  (See INSTALLATION  )
  9. INSTALL ENGINE ROOM SIDE COVER LH  (See INSTALLATION )
  10. INSTALL ENGINE ROOM SIDE COVER RH  (See INSTALLATION )
  11. INSTALL COOL AIR INTAKE DUCT SEAL  (See INSTALLATION )
  12. INSTALL V-BANK COVER SUB-ASSEMBLY  (See INSTALLATION )
  13. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL 
    1. Connect the cable to the negative (-) battery terminal.

      Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf) 

      NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See INITIALIZATION ).
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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