2. Press the release button...
3.... remove the bracket of the clamp of the wiring harness block...
4.... and disconnect the front block from the connector of the control unit.
5. Similarly, disconnect the block from the rear connector of the control unit.
6. Turn off four nuts of fastening of the block to an arm...
7.... and remove the engine control unit.
8. Install the engine control unit in the reverse order of removal.