Ignition Timing: Description and Operation

Ignition Timing Control at Engine Start (Initial Ignition Timing)
To obtain better starting performance of the engine at the engine start (when the engine speed is lower than 500 r/min.), ignition control system sets the ignition timing to the initial ignition timing (5 ° BTDC.)

Also, the initial ignition timing (5 ° BTDC) is restored when all of the following conditions are met.
- Diag. switch terminal not grounded
- Test switch terminal grounded
- Throttle valve at closed throttle position (Idle)
- Engine speed lower than 2,000 r/min (rpm)




Ignition Timing Control After Engine Start
The ignition timing after the engine start is determined as follows so that the spark occurs at the most suitable timing for each engine and vehicle conditions.