Ignition System: Description and Operation

Electronic Spark Advance (ESA) Control System:

^ The Electronic Spark Advance (ESA) System provides for ECU controlled ignition timing, replacing mechanical and vacuum advance mechanisms.
^ The ECU determines optimum ignition timing throughout the engine operating range by calculating inputs from various sensors and switches. The ECU triggers the coil by an output signal to the igniter.
^ The system also operates in conjunction with the turbocharging system to control knock by retarding timing when necessary.