2008 Toyota Prius BaseFACTORY OEM SERVICE PROCEDURE

Engine Control System: ECM: Removal

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
  2. REMOVE INSTRUMENT PANEL SUB-ASSEMBLY 
    1. Remove the instrument panel (see REMOVAL ).
  3. REMOVE NO. 3 HEATER TO REGISTER DUCT  (See REMOVAL )
  4. REMOVE ECM 
    1. Disconnect the 4 ECM connectors.
    2. Disconnect the 4 hybrid vehicle control ECU connectors.
      Fig 1: Identifying Hybrid Vehicle Control ECU Connectors And ECM Connectors
      G05189047Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the 2 nuts and bolt, and ECM with bracket.
      Fig 2: Identifying ECM Bracket Bolts And Nuts
      G05189048Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the 2 nuts and ECM.
      Fig 3: Locating ECM And Nuts
      G05189056Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Remove the 6 screws and 3 No. 1 ECM brackets.
      Fig 4: Locating ECM Brackets And Screws
      G05189050Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Remove the 4 screws and 2 No. 2 ECM brackets.
      Fig 5: Locating ECM Brackets And Screws
      G05189051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Remove the 2 screws and No. 3 ECM bracket.
      Fig 6: Locating ECM Brackets And Screws
      G05189052Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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