Ignition Coil

WARNING: This page is about a different car, the 2020 Land Rover Range Rover Velar. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

The ignition coils are installed in the cylinder head covers, under the Noise, Vibration and Harshness (NVH) covers. Each ignition coil locates on a spark plug and is secured to the related cylinder head cover with a single screw. Each ignition coil incorporates a 3 pin electrical connector for connection to the engine wiring harness.

Each ignition coil contains a primary and a secondary winding. The primary winding receives electrical power supply from the Powertrain Control Module (PCM) relay in the rear Engine Junction Box (EJB). A power stage in the primary winding allows the PCM to interrupt the power supply. The power supply interruption inducing a voltage in the secondary winding and thus the spark plug.

A diode in the ground side of the secondary winding reduces any undesirable switch-on voltage, to prevent misfiring into the intake manifold.

The power stage limits the following voltages:

the maximum voltage and current in the primary winding.
the current voltage in the primary winding, to protect the power stage.
the voltage in the secondary winding.