Engine Control System - Component And System Testing, On-Vehicle Inspection, Removal, Inspection & Installation: ECM: Removal

CAUTION: When removing and installing the ECM and hybrid vehicle control ECU, be sure to distinguish the wire harnesses of the ECM and hybrid vehicle control ECU. If the wire harnesses are incorrectly connected, damage may occur to the engine.

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.
REMOVE COOL AIR INTAKE DUCT SEAL (See REMOVAL )
REMOVE ENGINE ROOM SIDE COVER LH (See REMOVAL )
REMOVE ENGINE ROOM NO. 1 RELAY BLOCK COVER
REMOVE RADIATOR RESERVOIR ASSEMBLY
1. Disconnect the inverter drain hose from the bracket.
2. Remove the 2 bolts and radiator reservoir.
  
  Fig 1: Locating Radiator Reservoir Bolts
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REMOVE HYBRID VEHICLE CONTROL ECU
1. Detach the side of the wire harness clamp labeled A from the wire harness.
2. Detach the 3 wire harness clamps.
  
  Fig 2: Identifying Hybrid Vehicle Control ECU Wire Harness Clamp
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Remove the nut, 4 screws and bracket.
4. Remove the 2 screws and ECU.
  
  Fig 3: Locating Hybrid Vehicle Control ECU Nut And Screws
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Raise the lock lever and disconnect the 2 connectors. Remove the hybrid vehicle control ECU.
  NOTE: Make sure that the lock lever is raised 90° as shown in the illustration before disconnecting the connectors. Failure to do this may cause the connectors to break.
  
  Fig 4: Raising Lock Lever
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REMOVE ECM
1. Remove the 2 nuts and ECM with bracket.
  
  Fig 5: Locating ECM And Bracket Nuts
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the 2 ECM connectors.
  1. Raise the 2 levers while pushing the locks on the 2 levers, and remove the 2 ECM connectors.
    
    Fig 6: Disconnecting ECM Connectors
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Remove the 2 screws and ECM lower bracket.
  
  Fig 7: Locating ECM Lower Bracket Screws
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002