Turbo

The ignition, fuel, and turbocharger systems are all controlled by a single 35 pin control unit. The control unit also monitors input signals and will warn the driver if a fault exists in the system.
Incorporated in the engine control system is a digital ignition timing system. When the engine is running, the following information is processed by the control unit:

Engine speed
Reference mark (60° BTDC, cyl #1)
Hall sender signal (identifies cyl. #1)
Intake manifold pressure
Intake air temperature
Engine coolant temperature
Throttle position
Detonation (ignition "ping")

The control unit processes the information from these sensors and determines the best possible ignition timing for the operating conditions.
A self check system built into the control unit will retard the ignition timing if any of the following components are faulty:

Knock sensor
Engine coolant temperature sensor
Manifold pressure sensor
Intake air sensor
Idle switch