Engine Ignition

Engine Ignition

The ignition system consists of the following:

- Crankshaft Position (CKP) sensor
- Ignition coil
- Spark plug wires
- Spark plugs

The CKP sensor:

- is a variable reluctance sensor.
- is mounted on the engine front cover.
- is triggered by a 36-minus-1 tooth trigger wheel located on the crankshaft damper pulse ring.
- provides ignition timing and crankshaft speed to the PCM.

The ignition coil:

- changes low-voltage pulses from the PCM to high-voltage pulses.
- fires 2 spark plugs simultaneously.
- has 3 transformers.
- One transformer fires the spark plugs for cylinders 1 and 5
- One transformer fires the spark plugs for cylinders 2 and 6
- One transformer fires the spark plugs for cylinders 3 and 4

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