IGNITION COIL CONSTRUCTION/OPERATION [YF (2.0L Zetec)]

BUE011818100N03

• The ignition coil pack contains two separate coils. The ignition coils are triggered by the powertrain control module (PCM) in pairs (cylinder 1 and 4, cylinders 3 and 2) sending one ignition spark to the firing cylinder and one to the corresponding cylinder on the exhaust stroke.

- The majority of the ignition coil energy is used by the spark plug on the compression stroke.

- The firing voltage of one spark plug is negative with the respect to ground, while the firing voltage of the other spark plug in the cylinder pair is positive with respect to ground.