Vehicles With Auto Stop/Start System

When the ignition switch is operated, at the beginning of a drive cycle. The auto stop/start system operates the same, as on vehicles without the auto stop/start system.

The auto stop/start system is controlled by the Powertrain Control Module (PCM) and the Body Control Module/Gateway Module (BCM/GWM) through FlexRay. Also with signals from other system components and modules to determine the correct conditions for system operation. The auto stop/start system detects when it is appropriate to stop and start the engine.

The auto stop/start system automatically stops the engine in appropriate conditions, resulting in zero exhaust tailpipe emissions and saving fuel when the vehicle is stationary. When the driver is ready to move off, the engine instantly restarts. Sophisticated controls make sure that the auto stop/start system does not compromise the needs of either the driver or the vehicle.

The auto stop/start system can be enabled/disabled using the auto stop/start switch in the floor console.

Software within the PCM controls the operation of the auto stop/start system. In addition to its own dedicated components the auto stop/start system encompasses many other vehicle systems.

Complex technology interconnects these systems and makes sure that all the necessary conditions are satisfied by monitoring, among others:

• Brake vacuum pressure.
• Transmission Control Switch (TCS) position.
• Road speed.
• The state of vital vehicle systems.
• Environmental conditions.

The driver is notified that the engine stops by the auto stop/start warning indicator being illuminated in the Instrument Cluster (IC). Other warning indicators normally associated with an engine stoppage do not illuminate. For example the ignition and low oil pressure indicators, are suppressed so does not illuminate during an engine stoppage in an auto stop/start cycle.

The following conditions prevent an auto stop:

• A steering wheel paddle switch has been used to select a gear (transmission 'command shift' mode).
• The ambient air temperature is outside the range of 2°C to 40°C (36°F to 104°F).
• The ambient air pressure is less than 720 hPa.
• The engine coolant temperature is outside the range of 20°C to 107°C (68°F to 224°F).
• Brake vacuum is less than the threshold value.
• The hood is open.
• The driver door is open.
• The driver seatbelt is not fastened.
• High demand from the climate control system requires the engine to be running, for example, windshield dimmest selected.
• The startup battery charge is low.
• The Hill Descent Control (HDC) is active.
• The level in the fuel tank is too low (approximately 6 liters remaining in tank).
• The auto stop/start system is disabled using the auto stop/start switch.

While the vehicle is stationary, if a condition that prevented an auto stop is removed the PCM automatically initiates an auto stop.

The PCM automatically restarts the engine when 1 of the following occurs:

• The brake pedal is released with Drive (D) or Sport(S) selected on the TCS.
• The accelerator pedal is pressed.
• A paddle switch is used to select a gear.
• Reverse ('R') is selected on the TCS.
• Climate control system demand increases.
• The vehicle speed exceeds approximately 1 km/h (0.6 mph).
• Battery state of charge is near its lower threshold.
• Brake vacuum is less than the threshold value.
• The auto stop/start system is disabled using the auto stop/start switch.

The following prevents an auto restart and require use of the ignition switch to restart the engine:

• The hood is open.
• The driver seatbelt is not fastened.