LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2009 >> GS 450h >> Repair and Diagnosis (Single Page) >> Engine Performance >> Remove, Overhaul & Install >> Engine Control System (Service Information) >> ECM >> Installation >> Installation
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Engine Control System (Service Information): ECM: Installation: Installation

  1. INSTALL ECM 
      Fig 1: Locating ECM Lower Bracket Screws
      GTY130987Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Install the ECM to the ECM lower bracket with the 2 screws.

      Torque: 3.0 N*m ( 30 kgf*cm, 27 in.*lbf) 

      2. Fig 2: Connecting Connectors To ECM
      GTY126072Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the 2 ECM connectors.
      1. Connect the 2 connectors to the ECM and lower the 2 levers.
        NOTE:

        Make sure that the 2 levers are securely lowered.

      3. Fig 3: Locating ECM And Bracket Nuts
      GTY126420Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Install the ECM with bracket with the 2 nuts.

      Torque: 5.5 N*m ( 56 kgf*cm, 49 in.*lbf) 

  2. INSTALL HYBRID VEHICLE CONTROL ECU 
      Fig 4: Pushing Lock Lever Down To Lock Connectors
      GTY131911Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Make sure that the lock lever is raised 90° before connecting the connectors. Failure to do this may cause the lock lever and terminals to break.
      • Do not twist the wire harness when connecting the connectors.
    1. Connect the 2 connectors to the hybrid vehicle control ECU and push each lock lever down to lock the connectors.
      2. Fig 5: Locating Hybrid Vehicle Control ECU Nut And Screws
      GTY146880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Install the ECU with the 2 screws.

      Torque: 3.0 N*m ( 30 kgf*cm, 27 in.*lbf) 

    3. Install the bracket with the 4 screws and nut.

      Torque: 3.0 N*m ( 30 kgf*cm, 27 in.*lbf) 

      for screw

      Torque: 5.5 N*m ( 56 kgf*cm, 49 in.*lbf) 

      for nut

      4. Fig 6: Identifying Hybrid Vehicle Control ECU Wire Harness Clamp
      GTY147434Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Attach the 3 wire harness clamps.
    5. Attach the side of the wire harness clamp labeled A to the wire harness.
  3. INSTALL RADIATOR RESERVOIR ASSEMBLY 
      Fig 7: Locating Radiator Reserve Tank Assembly Bolts
      GTY146879Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Install the reservoir with the 2 bolts.

      Torque: 5.0 N*m ( 51 kgf*cm, 44 in.*lbf) 

    2. Connect the inverter drain hose to the bracket.
  4. INSTALL ENGINE ROOM NO. 1 RELAY BLOCK COVER 
  5. INSTALL ENGINE ROOM SIDE COVER LH  See step  32
  6. INSTALL COOL AIR INTAKE DUCT SEAL  See step  34
  7. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL 
  8. PERFORM REGISTRATION  . Refer to INSTALLATION - Step 8
  9. RESET MEMORY  . Refer to INSTALLATION - Step 9
  10. PERFORM INITIALIZATION 
    1. Perform initialization. Refer to INITIALIZATION .
      NOTE:

      Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.

scientia non olet · About LEMON Manuals