2004 Toyota Matrix Base, FWD, AutomaticFACTORY OEM SERVICE PROCEDURE

Remove, Overhaul & Install: ECM: Replacement

  1. DISCONNECT BATTERY NEGATIVE TERMINAL 
  2. REMOVE GLOVE COMPARTMENT DOOR ASSY ) 
  3. REMOVE ECM 
    Fig 1: Removing ECM
    G00923030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the 2 clips using a clip remover. Then, open the cover.
    2. Disconnect the 4 ECM connectors.
      Fig 2: Disconnecting ECM Connectors
      G00923031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the wire harness from the wire harness clamp.
    4. Remove the 2 bolts.
    5. Unfasten the claw and clip, and then remove the ECM.
    Fig 3: Removing Bolts & Unfasten Claw & Clip
    G00923032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. REMOVE ECM COVER 
    1. Take the 2 double-sided adhesive tapes off the ECM, then remove the ECM cover.
    Fig 4: Identifying 2 Double-Sided Adhesive Tapes On ECM
    G00923033Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. REMOVE ECM BRACKET NO.2 
    Fig 5: Removing ECM Bracket No.2
    G00923034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the 2 screws, then remove the ECM bracket No. 2.
  6. REMOVE ECM BRACKET NO.1 
    Fig 6: Removing ECM Bracket No.1
    G00923035Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the 2 screws, then remove the ECM bracket No. 1.
  7. REMOVE ECM BRACKET NO.3 (DELCO MADE, DENSO MADE (FOR 2ZZ-GE ENGINE TYPE)) 
    1. Remove the 2 screws, then remove the ECM bracket No. 3.
    Fig 7: Removing ECM Bracket No.3
    G00923036Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSTALL ECM BRACKET NO.3 (DELCO MADE, DENSO MADE (FOR 2ZZ-GE ENGINE TYPE)) 
    1. Torque: 3.2 N.m (33 kgf.cm, 28 in.lbf) 
  9. INSTALL ECM BRACKET NO.1 
    1. Torque: 3.2 N.m (33 kgf.cm, 28 in.lbf) 
  10. INSTALL ECM BRACKET NO.2 
    1. Torque: 3.2 N.m (33 kgf.cm, 28 in.lbf) 
  11. INSTALL ECM COVER 
    1. Install a new ECM cover to the ECM as shown in the illustration.
    Fig 8: Installing New ECM Cover To ECM
    G00923037Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. INSTALL ECM 
    1. Torque: 3.0 N.m (31 kgf.cm, 27 in.lbf) 
  13. INSTALL GLOVE COMPARTMENT DOOR ASSY 
  14. CONNECT BATTERY NEGATIVE TERMINAL 
    1. Torque: 5.4 N.m (55 kgf.cm, 48 in.lbf) 
  15. RESET MEMORY (A/T TRANSAXLE) 
    CAUTION: Perform the RESET MEMORY (AT initialization) when replacing the ECM, engine assembly or automatic transaxle assembly.
    1. The hand-held tester only.
      1. Connect the hand-held tester to the DLC3.
      2. Turn the ignition switch ON.
      3. Perform the RESET MEMORY procedure from the ENGINE menu.
    CAUTION: After performing the RESET MEMORY, be sure to perform the ROAD TEST described earlier.
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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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