Description

Two ignition control modules control firing of the spark plugs when triggered by the engine control module (ECM); the modules provide an interface between the ECM and the coil on plugs such that:

Ignition control module 1 drives bank 1 - coils 1 and 4, bank 2 - coils 2 and 3.
Ignition control module 2 drives bank 1 - coils 2 and 3, bank 2 - coils 1 and 4.