Solstice L4-2.0L Turbo (2008)
The ECM disengages the cruise control operation based on the signals from the following switches:
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The BPP sensor
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The CPP sensor, if equipped with a manual transmission
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The cruise control On/Off switch
The BPP sensor and the CPP sensor are used to disengage the cruise control system. The BPP sensor is mounted on the brake pedal bracket. Pressing the
brake pedal while the cruise control is engaged will disengage the cruise control system. The BCM monitors the BPP sensor via the brake pedal position
sensor signal circuit. The BCM sends a serial data message to the ECM indicating the position of the brake pedal. For further information on the BPP
sensor, refer to Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems
Description and Operation) or to Brake Pedal Position Sensor Calibration (See: Lighting and Horns/Brake Light Switch/Service and Repair/Brake Pedal
Position Sensor Calibration) . Pressing the clutch pedal while the cruise control is engaged will also disengage the Cruise Control System. The engine
control module (ECM) monitors the CPP sensor via the CPP sensor signal circuit as the voltage signal decreases while the pedal reaches the fully applied
position.
The cruise control system will also disengage when the cruise control on/off switch is switched OFF. The BCM sends a serial data message to the ECM
in order to disengage the cruise control system. The vehicle speed stored in the memory of the engine control module will be erased when the cruise
control On/Off switch is turned OFF, or the ignition switch is turned OFF. The cruise control system will also disengage when the ECM detects that a
driver override function has been active for approximately 60 seconds. When the cruise control system has been disengaged, the ECM sends a serial data
message to the driver information center (DIC) in order to turn off the CRUISE ENGAGED message.
Every time the cruise control system is disengaged, the ECM will keep track of the reason for system disengagement. The last 8 disengagement reasons
will be recorded within the ECM memory. The scan tool will display the last 8 Cruise Disengage History parameters, in which one out of approximately
50 possible reasons will be displayed in each of these 8 parameters. For the disengagement reason to be displayed within the scan tool parameter either
the cruise control system is active and disengagement is requested, or engagement of the system is requested but a fault is present. For a list of each
disengagement reason along with each definition, refer to Control Module References (See: Testing and Inspection/Programming and Relearning) in the
ECM Scan Tool Information.
Cruise Control Inhibited
The ECM inhibits the cruise control operation when any of the following conditions exist:
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The ECM has not detected a brake pedal activation from the body control module (BCM).
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A cruise control system DTC has been set.
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The vehicle speed is less than 40.2 km/h (25 mph).
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The vehicle speed is too high.
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The vehicle is in PARK, REVERSE, NEUTRAL, or 1st gear.
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The engine RPM is too low.
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The engine RPM is too high.
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The system voltage is not between 9-16 volts.
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The antilock brake system (ABS)/traction control system (TCS) is active for more than 2 seconds.
