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Home >> Jaguar >> 2019 >> XF S >> Repair and Diagnosis >> External Pages >> Different car >> Section 260 (Engine Ignition - V8 S/C 5.0L Petrol, Project 8 -- XE/(760)) >> Engine Ignition - V8 S/C 5.0L Petrol, Project 8 (G2261489) >> Description And Operation >> Engine Ignition >> Description >> Ignition Coil

Ignition Coil

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G11293842Courtesy 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 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, to induce 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 maximum voltage and current in the primary winding, to protect the power stage and limit the voltage in the secondary winding.

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