The four-terminal ignition coil is a block of two coils
The current in the primary windings of the coils is controlled by the controller depending on the engine operating mode.
The spark plug wires are connected to the terminals of the secondary (high-voltage) windings of the coils: to one winding - the 1st and 4th cylinders, to the other - the 2nd and 3rd.
Thus, the spark simultaneously jumps in two cylinders (1-4 or 2-3), in one during the compression stroke (working spark), in the other - during the exhaust stroke (idle).
The ignition coil is non-separable, if it fails, it is replaced.
Disconnect the connector from the ignition module.
Disconnect high-voltage wires.
Using a 10 mm socket, unscrew the three nuts securing the ignition module to the bracket
Remove the ignition module from the bracket studs.
The cylinder numbers are cast on the module
Install the ignition module in the reverse order