Starting System - Description & Operation

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Jaguar XKR, 2006 Jaguar XK8, 2005 Jaguar XKR, 2005 Jaguar XK8, and 2004 Jaguar XKR. However, it is still accessible from the selected car via links, so may be relevant.

The function of the starting system is to crank the engine fast enough to allow the engine to start. Heavy cables, connectors and switches are used in the system because of the large currents required.

The starting system consists of a pre-engaged type starter motor, battery, remote control switch (ignition switch) and relay. When the starter is operated from the ignition switch, the engagement lever moves the pinion into mesh with the engine ring gear teeth, the electrical contacts within the solenoid complete the high power circuit and the starter motor operates to turn the engine.

The vehicles have a transmission range sensor attached to the circuit which prevents operation of the starter motor unless NEUTRAL or PARK are selected.

The sequence of operation is as follows:

Ignition switch in the start position III.
Starter relay activated.
Voltage provided to the starter motor solenoid.
Starter solenoid engages the drive pinion to the flexplate.
Starter solenoid switches the battery current to the starter motor.
System remains engaged until the ignition switch is returned to the run position.