Engine Ignition

Engine Ignition

The ignition system contains the:

- Crankshaft Position (CKP) sensor.
- ignition coil.
- spark plug wire.
- spark plug.

The ignition system is:

- an electronic distributorless ignition system and is controlled by an electronic engine control integrated into the PCM.
- set at 10 degrees Before Top Dead Center (BTDC) for base timing and is not adjustable.

The 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 information on the CKP sensor, refer to Computers and Control Systems.

The ignition coil:

- changes low-voltage pulses from the PCM to high-voltage pulses.
- has 3 transformers.
- fires 2 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.

Coil Terminal-to-Cylinder Relationship