Remove the battery (see Removal the battery).

We pull forward the locking device of the engine control system wiring harness block…

…and disconnect the wiring harness connector from the control unit connector.

Using a 10 mm socket, unscrew the three nuts securing the block to the bracket…

…and remove the control unit.
We install the electronic control unit in the reverse order.
(Original version of the article on the website «CHEVYMAN.ru»)
