Ignition Coils
The 4 ignition coils are attached 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 wiring harness which connects the coil to ground. The third connection on the coil is a fused 12V 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 discharge at the appropriate time.
The PCM monitors the ignition coil control wires for faults and can store fault related Diagnostic Trouble Codes (DTCs). These can be retrieved using the Jaguar Land Rover (JLR) approved diagnostic equipment.