Automatic Restarting; Conditions Managed By The Ecm; Conditions Managed By The Bcm - Fiat TIPO Handbuch

Automatic restarting

When the Stop/Start is operational, under certain circumstances the engine may restart
automatically without any intervention by the driver due to comfort, emission control and safety
reasons.
These conditions leading to the engine automatic restarting can be detected and managed by the
BCM or by the ECM.

Conditions managed by the ECM

Braking system low vacuum: an automatic engine restart is forced if the vacuum sensor (see
paragraph on the sensors detected by the ECM for details on the individual sensors) transmits a
LOW value. This prevents undesired movements of the car with the engine off on a gradient due to a
possible brake servo failure.
Moving vehicle: An automatic engine restart is forced if the car speed is higher than a certain
threshold, named V_th_start (about 5 km/h). This condition avoids dangerous situations due to a
failure of the engine brake on gradients.
Engine cut-off by the Stop/Start system for a time longer than t_timeout_stop_1 (160 seconds).
Engaged reverse: if the driver engages reverse gear during an engine stop by the Stop/Start, the
Powertrain Control Module automatically restarts the engine. In this way the driveability during
parking manoeuvres is not compromised.
Cold engine: the NCM forces the automatic engine restart if the signal from the engine water
temperature sensor is below the threshold Temp_H20_min_ON (about 30°C). In this case the
reduction in consumption and emissions derived from the Stop/Start is not guaranteed.
The BCM requested the automatic engine restart without any action by the driver and
transmitted this information to the ECM by means of a specific message on C_CAN.
(STATUS_B_CAN2.BCMAutoStopStaySts = 0).
Catalytic converter temperature below a given threshold ( temp_catalist).
- The handbrake is applied whilst the car is moving (either forwards or in reverse) with the
engine stopped at a speed higher than the threshold V_th_start_HndBrk. (about 3 km/h). This is
a further safety measure to avoid dangerous situations due to a failure of the engine brake on
gradients.
For Diesel engines only. Particulate filter regeneration in progress; the Powertrain Control
Module automatically reactivates the engine if the DPF is carrying out the regeneration of the filter.

Conditions managed by the BCM

Battery not sufficiently charged or flat:
The BCM receives information from the IBS on the status of the battery charge.
If the IBS is being recalibrated, the engine is automatically restarted without any driver's intervention
if one of the following conditions occurs:
the battery Function Status (SOF) is below 7.6 V

the battery temperature is below −24°C

If the IBS is not being recalibrated, the engine is automatically restarted if one of the following
conditions occurs:
the battery Charge Status (SOC) is below 70%

the battery Health Status (SOH) is below 59%

the battery Function Status (SOF) is below 7.3 V

 the battery temperature is below −24°C

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