Engine Ignition: Notes

The ignition system consists of the following:

• crankshaft position (CKP) sensor
• ignition coil
• spark plug wire
• sparkplug

The ignition system is:

• an electronic distributorless ignition system (EDIS) is controlled by an electronic engine control integrated into the powertrain control module (PCM).
• set at 10 degrees before top dead center (BTDC) for base timing, and is not adjustable.

The crankshaft position (CKP) sensor:

• is a variable reluctance sensor.
• senses a missing tooth on the crankshaft damper pulse ring.
• generates a crankshaft position signal which is sent to the PCM. The PCM counts this signal for engine RPM.

For additional information on the CKP sensor, refer to ELECTRONIC ENGINE CONTROLS .

The ignition coil:

• changes low voltage pulses from the PCM to high voltage pulses.
• has three transformers.
• fires two spark plugs simultaneously.

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 the gap, which ignites the fuel and air mixture.

The firing order is: 1-4-2-5-3-6.