The ignition system on this vehicle uses the ESA (Electronic Spark Advance)
system and consists of the following parts:
| • | The Powertrain Control Module (PCM) |
| • | The PCM analyzes the engine's ignition requirements using sensor inputs,
The PCM's internal programming, and factoring in the saturation time of the ignition
coil windings. The PCM then determines optimal ignition timing and signals the Ignition
Control Module. |
| • | The Ignition Control Module: The Ignition Control (IC) module turns ON
and OFF the primary current of the ignition coil according to the signal from the
PCM. |
| • | The Ignition Coil: The ignition coil is located in the distributor. When
the ignition coil primary current is turned OFF, a high voltage is induced in the
secondary winding. |
| • | The Distributor: The distributor distributes a high voltage current induced
by the ignition coil to each spark plug. |
| • | The High Tension Secondary Ignition Wires |
| • | The Camshaft Position (CMP) sensor: The CMP sensor is located in the
distributor. The CMP sensor converts the crank angle into a digital voltage signal
and sends the signal to the PCM. |
In the ESA system, the PCM is programmed for the best possible ignition timing
for every engine condition. The PCM processes information from the sensors (MAF sensor,
TP sensor, ECT sensor, IAT sensor, VSS, etc.) and selects the most suitable
ignition timing from its memory. The ignition control module receives the signal from
the PCM and triggers the ignition coil accordingly.
