Operation - Vehicles With Stop/Start System: Notes

At the beginning of a drive cycle, when the Stop/start switch is operated, the Auto stop/start system operates in the same way as on vehicles without stop/start.

The Auto stop/start system is controlled by the ECM and the Gateway Module (GWM) via High Speed (HS) Controller Area Network (CAN) powertrain systems bus messages and 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.

Before the engine is stopped the following parameters must be detected:

• The vehicle must be stopped from a speed greater than 4 km/h (2.5 mph)
• Sufficient brake pressure must be applied to the brake pedal to ensure the vehicle is stationary
  • OR
• The vehicle must be stationary and 'P' or 'N' selected on the TCS.

Before the engine is restarted, the following parameters must be detected:

• 'D' (Drive) or 'S' (Sport) position is selected on the TCS and the brake pedal is released
• The accelerator pedal is pressed (ECM detects a signal from the Accelerator Pedal Position (APP) sensor)
• A steering wheel paddle switch is operated to select a gear
• 'R' (Reverse) gear is selected on the TCS
• Climate control system demand increases (signal from the Automatic Temperature Control Module (ATCM)
• The vehicle speed exceeds approximately 1 km/h (0.5 mph)
• Battery charge becomes low
• Brake vacuum has been reduced from repeated use of pedal with engine not running (detected by ECM from the brake vacuum sensor)
• Auto stop/start is deactivated using Auto stop/start switch on the ICP.

The following conditions will prevent an Auto stop:

• A steering wheel paddle switch has been used to select a gear
• The external ambient temperature is less than 0°C (32°F) (detected by the ECM via the Ambient Air Temperature (AAT) sensor)
• The external ambient temperature is more than 40°C (104°F) (detected by the ECM via the AAT sensor)
• The engine has not reached its optimum operating temperature (detected by ECM from Engine Coolant Temperature (ECT) sensor)
• The driver door is opened (detected by Central Junction Box (CJB) from door ajar switch)
• The driver safety belt is not fastened (detected by Restraints Control Module (RCM) from driver front buckle switch)
• The climate control system requires the engine to be running, for example; windshield demist selected
• The hood is open (detected by CJB from hood ajar switch)
• Auto stop/start is deactivated using the Auto stop/start switch in the ICP.