Ignition System: Description and Operation

Ignition Timing Control System:

CIRCUIT OPERATION
The ignition timing is controlled by the ECU to help maintain the best A/F mixture under all operating conditions.

The ECU uses several sensors to calculate the amount of timing based on a map stored in its memory. The ECU varies the timing during:
- Starting
- Warm up
- Idle
- Low battery voltage

Power Transistor:

POWER TRANSISTOR
The power transistor, located on the R.F. frame rail in the engine compartment, is a voltage amplifier that allows the signal sent from the ECU to activate the primary circuit in the ignition coil. This induces high voltage in the secondary windings of the ignition coil, providing spark to the distributor cap and plugs.