Ignition System: Description and Operation

The ignition system consists of the:
- Crankshaft Position (CKP) sensor.
- ignition coil.
- Ignition wire and bracket.
- spark plugs.

The ignition system is:
- an Electronic Distributorless Ignition System (EDIS) controlled by an Electronic Engine Control (EEC) integrated into the Powertrain Control Module (PCM).
- set at 10 degrees Before Top Dead Center (BTDC) for base timing and it is not adjustable.

The crankshaft position sensor:
- is a variable-reluctance sensor.
- senses a missing tooth on crankshaft damper pulse ring.
- generates a crankshaft position signal which is sent to the powertrain control module. The powertrain control module counts this signal for engine rpm and spark advance.

The ignition coil:
- changes low voltage pulses from the powertrain control module to high voltage pulses.
- has two transformers.

Spark plug wires:
- carry high voltage pulses from the ignition coil to the spark plugs.

The spark plugs:
- change high voltage pulses to spark at gap which ignites fuel and air mixture.
- have a platinum-enhanced active electrode for long life. The active electrode is different for LH and RH sides.
- have replacements with both electrodes platinum-enhanced so they can be used on either side.