240 L4-2320cc 2.3L SOHC VIN 82 B230F (1992)
The DI control module computes ignition timing twice per revolution, once per ignition. It bases the basic ignition timing on engine speed and the load
signal from the MFI control module.
Under certain conditions the control module then adjusts the basic ignition timing to provide for optimum combustion and operation.
- When the car is being started ignition timing is only dependent on engine speed and engine temperature.
- When the engine is idling ignition timing is only dependent on engine speed.
- At temperatures below 55°C (131°F) ignition is retarded as a function of temperature.
- At temperatures below 60°C (140°F) no account is taken of the KS signal.
- If the engine is over-revving the control module uses
the power stage to provide a spark only to every other spark plug so that engine power is reduced.
Ignition Voltage Control
The control module controls the ignition voltage so that it is independent of battery voltage and engine speed. At low voltage the control module sends a
signal to the power stage to start charging the coil earlier thereby extending charging time.
