2008 Toyota Prius BaseFACTORY OEM SERVICE PROCEDURE

Engine Control System: ECM: Installation

  1. INSTALL ECM 
    1. Install the No. 3 ECM bracket with the 2 screws.
      Fig 1: Locating ECM Bracket And Screws
      G05189052Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Install the 2 No. 2 ECM brackets with the 4 screws.
      Fig 2: Locating ECM Bracket And Screws
      G05189051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Install the 3 No. 1 ECM brackets with the 6 screws.
      Fig 3: Locating ECM Brackets And Screws
      G05189050Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Install the ECM with the 2 nuts.

      Torque: 3.0 N*m (31 kgf*cm, 27 in.*lbf) 

      Fig 4: Locating ECM And Nuts
      G05189056Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Install the ECM with bracket with the 2 nuts and bolt.

      Torque: 3.0 N*m (31 kgf*cm, 27 in.*lbf) 

      Fig 5: Identifying ECM Bracket Bolts And Nuts
      G05189048Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Connect the 4 hybrid vehicle control ECU connectors.
    7. Connect the 4 ECM connectors.
  2. INSTALL NO. 3 HEATER TO REGISTER DUCT  (See INSTALLATION )
  3. INSTALL INSTRUMENT PANEL SUB-ASSEMBLY 
    1. Install the instrument panel (see INSTALLATION ).
  4. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL 
    Fig 6: Identifying Hybrid Vehicle Control ECU Connectors And ECM Connectors
    G05189047Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. PERFORM INITIALIZATION 
    1. Perform initialization (see INITIALIZATION ).
      NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.
Factory Service Tools

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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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