Engine Control System (Service Information) (Plug-In): ECM: Removal: Removal

PRECAUTION
NOTE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

HV battery learning values are stored in the power management control ECU and ECM to display "HAVE TRACTION BATTERY INSPECTED" on the multi-information display. When either of these ECUs is replaced, the new ECU receives the HV battery learning value data from the other ECU and updates the information.
NOTE:
- Do not replace the power management control ECU and ECM at the same time as it clears the HV battery learning values. However, if it is necessary to replace both ECUs at the same time, replace them by following the procedure below.
- Do not replace the power management control ECU or ECM with used ones from other vehicles.
1. Procedure when replacing both power management control ECU and ECM:
  1. Disconnect the cable from the negative (-) auxiliary battery terminal.
  2. Replace either of the ECUs.
  3. Connect the cable to the negative (-) auxiliary battery terminal.
  4. Turn the power switch on (READY) and wait for 5 minutes or more.
  5. Turn the power switch off and disconnect the cable from the negative (-) auxiliary battery terminal.
  6. Replace the other ECU.
  7. Connect the cable to the negative (-) auxiliary battery terminal.
  8. Check that the power switch can be turned on (READY).
    HINT:
    
    If the power management control ECU and ECM are replaced at the same time without following the above procedure, replace either of the ECUs with its original one and then replace it again by following the above procedure. If the correct procedure is not followed, perform the procedure again from the beginning.
REMOVE REAR NO. 3 FLOOR BOARD . Refer to REMOVAL - Step 2
REMOVE DECK FLOOR BOX RH . Refer to REMOVAL - Step 3
DISCONNECT CABLE FROM AUXILIARY BATTERY NEGATIVE TERMINAL
NOTE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .
SEPARATE INVERTER RESERVE TANK ASSEMBLY
1. Remove the 2 bolts and separate the inverter reserve tank assembly.
  
  Fig 1: Identifying Radiator Reservoir Tank Assembly & Bolts
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REMOVE ECM
1. Remove the No. 1 relay block cover.
2. Disconnect the 3 wire harness connectors.
  
  Fig 2: Identifying ECM No. 1 Relay Block Cover & Wire Harness Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disengage the 2 claws, push up the engine room wire harness and separate it from the engine room relay block.
  
  Fig 3: Identifying Engine Room Wire Harness & Claws
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Disengage the 2 claws and push up the side cover to remove it.
  
  Fig 4: Identifying Connector & Side Cover & Claws
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Loosen the bolt and separate the No. 2 engine room wire.
  
  Fig 5: Identifying No. 2 Engine Room Wire & Bolt
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Disconnect the 2 ECM connectors.
  1. Disconnect the 2 wire harness clamps.
    
    Fig 6: Identifying Wire Harness, Clamps & Lever Locks
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Push the locks on the 2 levers, then raise the levers, and disconnect the 2 ECM connectors.
    NOTE:
    After disconnecting the connectors, make sure that dirt, water or other foreign matter does not contact the connecting parts of the connectors.
7. Separate the 3 wire harness clamps.
  
  Fig 7: Identifying Wire Harness Clamps
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
8. Remove the 2 bolts and ECM with 2 ECM brackets.
  
  Fig 8: Identifying ECM Brackets & Bolts
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002