Ignition Coils

WARNING: This page is about a different car, the 2018 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.

Four ignition coils are fitted directly to the spark plugs and are located in the center of the camshaft carrier. The ignition coils are secured to the camshaft carrier with screws.

The ignition coils are each connected to the Powertrain Control Module (PCM) by a signal wire for the PCM to operate the coil. A second wire from the coil goes to a splice in the harness supplying the coil with a ground signal. The third connection on the coil is a fused 12 V power supply from the PCM relay. The PCM relay is located in the right Engine Junction Box (EJB).

Each coil contains a power stage which controls the primary current. The PCM controls the spark timing and production by switching the power stage of each coil to ground. This method allows to the coil to charge up and then produce a spark at the spark plug at the appropriate time.

The PCM monitors the ignition coil control wires for faults and can store fault related Diagnostic Trouble Code (DTC). These can be retrieved using a Jaguar approved diagnostic equipment.