Cobalt L4-2.2L (2008)
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The brake pedal position (BPP) sensor
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The clutch pedal position (CPP) sensor, if equipped with a manual transmission
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The cruise control on/off switch
The cruise control system will disengage when the brake pedal is applied. The body control module (BCM) monitors the BPP sensor via the BPP sensor
signal circuit as the voltage signal increases while the pedal reaches the fully applied position. The ECM monitors the BPP signal through a discrete
input and a serial data message signal from the BCM indicating the brake status. When both signals indicate the brake pedal is applied, the ECM will
disengage the cruise control system. For further information on the BPP sensor, refer to Exterior Lighting Systems Description and Operation. 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.
Cruise Control Inhibited
The engine control module (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 related 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 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, with fuel cut off.
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The vehicle speed is too high, with fuel cut off.
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The system voltage is not between 9-16 volts.
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The Antilock Brake System/Traction Control System is active for more than 2 seconds.
