Auto Stop/Start Starter Motor Strategy

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Engine restart without starter motor intervention

The Powertrain Control Module (PCM) detects engine restart parameters resulting from a driver action or system request. The PCM 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 starter motor intervention

If the PCM 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 PCM activates the starter motor via the starter relay at the earliest opportunity to rotate the engine. Then on the first available compression the PCM operates the fuel injection and ignition systems to restart the engine in less than 0.36 seconds.