Club Alfa RomeoNederland

Kwam op ander forum bericht tegen over de condities waaronder start/stop wel of niet werkt, uit het service manual, ter info :


From the service manual:

Engine Failure to Stop Conditions
When the ESS system is active, the engine may not stop in some conditions for reasons of comfort, emission control and safety. These conditions include:
- Engine temperature is still cold
- Battery is not sufficiently charged
- Windshield wipers are being used at maximum speed
- Driver's door is not shut
- Driver's seat belt is not fastened
- Vehicle is in the reverse gear(e.g. parking maneuver)
- When Automatic Temperature Control (ATC) is equipped, a desirable level of comfort has not been reached
- Barometric pressure (over threshold)
A message will appear on the instrument panel display in these cases.

Engine conditions that disable Autostop
When the ESS system is activated, there are specific conditions that will prevent the ESS system event to occur. The following conditions leading to an ESS system operation preventiont can be detected and managed by the BCM or the PCM:

Cold engine: Autostop is prevented if the Engine Coolant Temperature (ECT) sensor is outside of a range of 40°C (104°F) and 100°C (212°F). In this case, the fuel efficiency and emission reduction deriving from use of the ESS system is not guaranteed .

Reverse gear is engaged: the PCM will not allow the automatic stopping of the engine if reverse gear is engaged . This measure has been adopted in order not to adversely affect performance during parking maneuvers.

A malfunction or fault detected in at least one of the following components will also disable the ESS system:
- Accelerator Pedal Position Sensor (APPS)
- Brake pedal position sensor
- Automatic Braking System (ABS) Hydraulic Control Unit (HCU)
- ECT sensor
- Wheel Speed Sensors (WSS)
- Engine crank sensor
- Engine camshaft sensor
- Reverse switch
- PCM (Malfunction Indicator Lamp/MIL on)

The BCM will signal prevent the engine automatic stopping by sending a CAN-C data bus network message if one or more conditions managed by the BCM occur:

Battery not being sufficiently charged
- IBS calibrating
- SOF of the battery is below 8 .3 V
- Battery temperature is below -23°C (-9°F)

If the IBS is not calibrating, Autostop will be prevented if one of the following conditions occurs:
- SOC is below 75%
- SOH is below 60%
- SOF is below 8 .2 V
- Battery temperature is below -23°C (9°F)

IBS fault: The automatic engine stop event is prevented if an IBS malfunction occurs.

Driver's door not shut: Autostop is prevented if the driver's door is open .

Driver's seat belt not fastened: Autostop is prevented if the driver's seat belt is not fastened .

Outside temperature sensor: Autostop is prevented if:
- Outside temperature is lower than -16 °C (3°F)
- Outside temperature is higher than 82 °C (180°F)
- NOTE: The temperature limits that have been set on the outside temperature sensor are "extreme" and therefore must always be considered .

ATC: Autostop is prevented if the difference between the climate control temperature set by the customer and the temperature inside the passenger compartment is greater than ± 4°C (39°F)
NOTE: If the vehicle is equipped with manual air conditioning, the engine can always be Autostopped .

Generator fault: Autostop is prevented in the case of generator malfunctions.

Hood open: Autostop is prevented if the hood is open.

Logistic Mode status active: Autostop is prevented if the Logistic Mode status is active.

BCM relay fault: Autostop is prevented if there is a starting circuit relay issue. The relay is operated by the BCM.

Steering position: Autostop is prevented if the Steering Angle Sensor (SAS) is out of calibrated range.

Fuel level: if the fuel level is below a certain threshold, Autostop is disabled