2004 Toyota PriusFACTORY OEM SERVICE PROCEDURE

ECM (1NZ-FXE): Replacement

  1. REMOVE REAR FLOOR BOARD NO.2 (See  REPLACEMENT  ) 
  2. REMOVE DECK FLOOR BOX REAR (See  REPLACEMENT  ) 
  3. REMOVE REAR FLOOR BOARD NO.3 (See  REPLACEMENT  ) 
  4. DISCONNECT ENGINE WIRE NO.3 (BATTERY NEGATIVE TERMINAL) (See  REPLACEMENT  ) 
  5. REMOVE INSTRUMENT PANEL REGISTER ASSY NO.1 (See  INSTRUMENT PANEL/METER  ) 
  6. REMOVE INSTRUMENT PANEL FINISH PANEL SUB-ASSY LOWER (See  INSTRUMENT PANEL/METER  ) 
  7. REMOVE INSTRUMENT PANEL FINISH PANEL SUB-ASSY UPPER (See  INSTRUMENT PANEL/METER  ) 
  8. REMOVE INSTRUMENT PANEL REGISTER ASSY NO.3 (See  INSTRUMENT PANEL/METER  ) 
  9. REMOVE INSTRUMENT PANEL REGISTER ASSY NO.4 (See  INSTRUMENT PANEL/METER  ) 
  10. REMOVE INSTRUMENT PANEL REGISTER ASSY NO.2 (See  INSTRUMENT PANEL/METER  ) 
  11. REMOVE MULTI-DISPLAY ASSY (See  AUDIO & VISUAL SYSTEM  ) 
  12. REMOVE GLOVE COMPARTMENT DOOR STOPPER SUB-ASSY (See  INSTRUMENT PANEL/METER  ) 
  13. REMOVE GLOVE COMPARTMENT DOOR ASSY (See  INSTRUMENT PANEL/METER  ) 
  14. REMOVE INSTRUMENT PANEL CUSHION 
  15. REMOVE INSTRUMENT CLUSTER FINISH PANEL END 
  16. REMOVE INSTRUMENT PANEL HOLE COVER (See  INSTRUMENT PANEL/METER  ) 
  17. REMOVE GLOVE COMPARTMENT DOOR (See  INSTRUMENT PANEL/METER  ) 
  18. REMOVE INSTR PANEL SPEAKER PANEL SUB-ASSY NO.1 W/CTR SPEAKER (W/ JBL SOUND SYSTEM) (See  AUDIO & VISUAL SYSTEM  ) 
  19. REMOVE FRONT PILLAR GARNISH CORNER PIECE LH (See  EXTERIOR/INTERIOR TRIM  ) 
  20. REMOVE FRONT PILLAR GARNISH CORNER PIECE RH (See  EXTERIOR/INTERIOR TRIM  ) 
  21. REMOVE FRONT PILLAR GARNISH LH (See  EXTERIOR/INTERIOR TRIM  ) 
  22. REMOVE FRONT PILLAR GARNISH RH (See  EXTERIOR/INTERIOR TRIM  ) 
  23. DISCONNECT PASSENGER AIRBAG CONNECTOR (See  AIR BAG RESTRAINT SYSTEMS  ) 
  24. REMOVE INSTRUMENT PANEL SUB-ASSY W/PASSENGER AIRBAG ASSY (See  INSTRUMENT PANEL/METER  ) 
  25. REMOVE HEATER TO REGISTER DUCT NO.3 (See  OVERHAUL  ) 
  26. REMOVE ECM 
    1. Disconnect the 4 ECM connectors.
    2. Disconnect the 4 hybrid vehicle control ECU connectors.
      Fig 1: Locating 4 ECM Connectors & 4 Hybrid Vehicle Control ECU Connectors
      G02920043Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the 2 bolts and nut, then remove the ECM.
      Fig 2: Locating 2 Bolts, Nut Of ECM
      G02920044Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the 2 nuts, then remove the ECM.
      Fig 3: Locating 2 Nuts Of ECM
      G02920045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Remove the 6 screws, then remove the 3 ECM brackets No. 1.
      Fig 4: Locating 6 Screws Of 3 ECM Brackets No. 1
      G02920046Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Remove the 4 screws, then remove the 2 ECM brackets No. 2.
      Fig 5: Locating 4 Screws Of 2 ECM Brackets No.2
      G02920047Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Remove the 2 screws, then remove the ECM bracket No. 3.
      Fig 6: Locating 2 Screws Of ECM Bracket No.3
      G02920048Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  27. INSTALL ECM 
    1. Torque: 3.0 N.m (31 kgf.cm, 27 in.lbf) 
  28. INSTALL HEATER TO REGISTER DUCT NO.3 
  29. INSTALL INSTRUMENT PANEL SUB-ASSY W/PASSENGER AIRBAG ASSY 
  30. CONNECT PASSENGER AIRBAG CONNECTOR 
  31. INSTALL FRONT PILLAR GARNISH RH 
  32. INSTALL FRONT PILLAR GARNISH LH 
  33. INSTALL FRONT PILLAR GARNISH CORNER PIECE RH 
  34. INSTALL FRONT PILLAR GARNISH CORNER PIECE LH 
  35. INSTALL INSTR PANEL SPEAKER PANEL SUB-ASSY NO.1 W/CTR SPEAKER (W/ JBL SOUND SYSTEM) 
  36. INSTALL GLOVE COMPARTMENT DOOR 
  37. INSTALL INSTRUMENT PANEL HOLE COVER 
  38. INSTALL INSTRUMENT CLUSTER FINISH PANEL END 
  39. INSTALL INSTRUMENT PANEL CUSHION 
  40. INSTALL GLOVE COMPARTMENT DOOR ASSY 
  41. INSTALL GLOVE COMPARTMENT DOOR STOPPER SUB-ASSY 
  42. INSTALL MULTI-DISPLAY ASSY 
  43. INSTALL INSTRUMENT PANEL REGISTER ASSY NO.2 
  44. INSTALL INSTRUMENT PANEL REGISTER ASSY NO.4 
  45. INSTALL INSTRUMENT PANEL REGISTER ASSY NO.3 
  46. INSTALL INSTRUMENT PANEL FINISH PANEL SUB-ASSY UPPER 
  47. INSTALL INSTRUMENT PANEL FINISH PANEL SUB-ASSY LOWER 
  48. INSTALL INSTRUMENT PANEL REGISTER ASSY NO.1 
  49. CONNECT ENGINE WIRE NO.3 (BATTERY NEGATIVE TERMINAL) (See  REPLACEMENT  ) 
  50. INSPECT SRS WARNING LIGHT (See  AIR BAG RESTRAINT SYSTEMS  ) 
  51. INSTALL REAR FLOOR BOARD NO.3 
  52. INSTALL DECK FLOOR BOX REAR 
  53. INSTALL REAR FLOOR BOARD NO.2 
  54. POWER WINDOW CONTROL SYSTEM INITIALIZE (See  INTRODUCTION  ) 
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.