Stop/Start Strategy

WARNING: This page is about a different car, the 2019 Jaguar XJ and 2018 Jaguar XJ. However, it is still accessible from the selected car via links, so may be relevant.

Engine restart without motor intervention

When the ECM detects engine restart parameters resulting from a driver action or system request, the ECM activates the fuel injection and ignition systems to allow the engine to continue to operate. This is available at a variable engine speed threshold which depends on engine type.

Engine restart with motor intervention

If the ECM cannot restart the engine without intervention, the restarting of the engine is controlled via the starter motor. The starter motor has the capability of engaging with the transmission ring gear whilst still rotating.

If an engine restart is initiated, the ECM activates the starter motor via the starter relay at the earliest opportunity to rotate the engine, then on the first available compression the ECM operates the fuel injection and ignition systems to restart the engine in less than 0.36 sec.