Ignition System: Description and Operation

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

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 ignition coil:
- changes low voltage pulses from the powertrain control module to high voltage pulses.
- sends high voltage pulses to the spark plugs through the spark plug wires.
- has three transformers.
- has six spark plug wires, one to each end of each transformer.
- is mounted on top of the intake manifold.

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 a 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.
- used for replacement are AGSF-34EE; the electrodes are platinum-enhanced so they can replace either a RH or LH spark plug.







The spark plugs on the RH side (cylinders 1, 2 and 3) spark plugs are AGSF-34EG.







The spark plugs on the LH side (cylinders 4, 5 and 6) are AGSF-34E.

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.