Starter Motor Relay

Every engine start (auto or driver induced) is recorded by increments on a counter. When the count is equal to a calibrated threshold, the ESS autostop event is inhibited until a cool down cycle has been run. The number of allowable ESS start events is a function of the ambient temperature. As the ambient temperature increases, the number of ESS events will decrease. The quick cool down cycle is defined as a calibrated drive period above a calibrated vehicle speed. The slow cool down cycle is defined as the time from the last crank since the inhibit event was recorded.

If the starter is energized by the starter control relay during an Autostart event and the engine does not start within a calibrated time, the starter control relay will be deactivated and an ignition cycle will then be required. If the starter is energized by the starter control relay and run mode is not achieved, the PCM will drop the High Side Driver (HSD) to the starter control relay and command the BCM to drop the Low Side Driver (LSD). At this point for either scenario, the ESS will be disabled and a DTC will set.