Driver Ride Selection on LNF...
11-02-2007, 02:58 PM
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Driver Ride Selection on LNF...
I remember reading through the information that there is a competition and street mode for the Cobalt LNF SS T/C.
Anyone remember where that is, what it means? Is it like the 400hp Normal M5 and the Track 500hp version w/ a selection knob or what?
Does it disable stability control, or what? How does it work? Any info would be much appreciated!
CobaltSScrazy
Anyone remember where that is, what it means? Is it like the 400hp Normal M5 and the Track 500hp version w/ a selection knob or what?
Does it disable stability control, or what? How does it work? Any info would be much appreciated!
CobaltSScrazy
11-02-2007, 05:47 PM
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They haven't officially released what features will be turned on or off with these "profiles". But one can assume it will do things like turn of traction control, enable launch mode, and turn on no-lift shift.
There may be other features that aren't announced yet. You're best bet would be to read up on the Solstice GXP or the Sky Redline, as both of those cars have all these features already. (The SS/TC has uses the same PCM as all other LNF based cars).
There may be other features that aren't announced yet. You're best bet would be to read up on the Solstice GXP or the Sky Redline, as both of those cars have all these features already. (The SS/TC has uses the same PCM as all other LNF based cars).
11-05-2007, 01:12 PM
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From the Solstice GXP manual, this does not necessarily indicate what the Cobalt SS will have since the Cobalt SS is FWD and the Solstice is RWD.
and
Detailed definition of terms, this comes from the solforum and was put together by our very informative member Small Dealer who works for a small Pontiac dealership. 
Traction Control Switch
Traction Control Switch Off, or Competitive Mode:
The Traction switch has multiple functions depending on the switch sequence applied.
1) When the Traction switch is pushed once, only the Traction control will be disabled.
2) When the Traction switch is pressed twice within a 5 second time frame the EBCM will disable Traction and put the VSES into a Competitive mode which will limit VSES control.
3) When the Traction switch is pressed and held for 5 seconds the Traction and VSES will be disabled.
The Traction will be re-enabled by default when an ignition cycle is performed.
Traction Control Switch Off, or Competitive Mode:
The Traction switch has multiple functions depending on the switch sequence applied.
1) When the Traction switch is pushed once, only the Traction control will be disabled.
2) When the Traction switch is pressed twice within a 5 second time frame the EBCM will disable Traction and put the VSES into a Competitive mode which will limit VSES control.
3) When the Traction switch is pressed and held for 5 seconds the Traction and VSES will be disabled.
The Traction will be re-enabled by default when an ignition cycle is performed.
Competitive Driving Mode
The driver can select this optional handling mode by pressing the ESC/TCS button on the console two times within a five second time period. COMPETITIVE MODE will be displayed in the DIC. Competitive Driving Mode allows the driver to have full control of the rear wheels while the ESC system helps maintain directional control of the vehicle by selective brake application. The ESC/TCS light will be on and the traction control system will not be operating. Adjust your driving accordingly. This electronic stability control mode is recommended only for use during closed track events and competitive driving venues.
When you press the ESC button again, or restart the vehicle, the ESC and TCS will be turned back on.
Notice: When traction control is turned off, or Competitive Driving Mode is active, it is possible to lose traction. If you attempt to shift with the rear wheels spinning with a loss of traction, it is possible to cause damage to the transmission. Do not attempt to shift when the rear wheels do not have traction. Damage caused by misuse of the vehicle is not covered. See your warranty book for additional information.
The driver can select this optional handling mode by pressing the ESC/TCS button on the console two times within a five second time period. COMPETITIVE MODE will be displayed in the DIC. Competitive Driving Mode allows the driver to have full control of the rear wheels while the ESC system helps maintain directional control of the vehicle by selective brake application. The ESC/TCS light will be on and the traction control system will not be operating. Adjust your driving accordingly. This electronic stability control mode is recommended only for use during closed track events and competitive driving venues.
When you press the ESC button again, or restart the vehicle, the ESC and TCS will be turned back on.
Notice: When traction control is turned off, or Competitive Driving Mode is active, it is possible to lose traction. If you attempt to shift with the rear wheels spinning with a loss of traction, it is possible to cause damage to the transmission. Do not attempt to shift when the rear wheels do not have traction. Damage caused by misuse of the vehicle is not covered. See your warranty book for additional information.
ABS Description and Operation
This vehicle is equipped with the MK 25 E Continental Teves antilock braking system.
The vehicle is equipped with the following braking systems:
• Antilock Brake System (ABS)
• Engine Drag Control (EDC)
• Electronic Brake Distribution (EBC)
• Traction Control System (TCS)
• Vehicle Stability Enhancement System (VSES) (w/JL4)
The following components are involved in the operation of the above systems:
• Electronic Brake Control Module (EBCM) - The EBCM controls the system functions and detects failures.
The EBCM contains the following components:
• Brake Pressure Modulator Valve (BPMV) - The BPMV contains the hydraulic valves and pump motor that are controlled electrically by the EBCM. The BPMV uses a 4 circuit configuration with a diagonal split. The BPMV directs fluid from the reservoir of the master cylinder to the left front and right rear wheels and fluid from the other reservoir to the right front and left rear wheels. The diagonal circuits are hydraulically isolated so that a leak or malfunction in one circuit will allow continued braking ability on the other.
Important: There is a rubber isolator located under the BPMV and on the mounting studs. The rubber isolators protect the BPMV and the EBCM from vehicle vibrations.
• The BPMV contains the following components:
- Pump Motor
- Inlet Valves (one per wheel)
- Outlet Valves (one per wheel)
- Master Cylinder Isolation Valves (one per drive wheel)
• The wheel speed sensor receives a 12-volt power supply voltage from the electronic brake control module (EBCM) and provides an output signal to the EBCM. As the wheel spins, the wheel speed sensor sends the EBCM a DC square wave signal. The EBCM uses the frequency of the square wave signal to calculate the wheel speed.
• Traction Control Switch - The TCS is manually disabled or enabled using the traction control switch.
• Brake Pedal Position - The EBCM uses the BPP sensor as an indication that the brake pedal is applied.
• Lateral Accelerometer Sensor (w/JL4) - The EBCM uses the lateral accelerometer sensor as an indication of the lateral acceleration of the vehicle.
• Yaw Rate Sensor (w/JL4) - The EBCM uses the yaw rate sensor as an indication of the yaw rate of the vehicle.
• Steering Wheel Position Sensor (SWPS) (w/JL4) - The EBCM uses the SWPS as an indication of the position and rotation of the steering wheel.
Initialization Sequence
The EBCM performs 1 initialization test each ignition cycle. The initialization of the EBCM occurs when 1 set of the following conditions occur:
• The EBCM detects that there is a minimum of 500 RPM from the ECM via a serial data message.
• The brake pedal position sensor is not applied.
OR
Both of the following conditions occur:
• The vehicle speed is greater than 16 km/h (10 mph).
• The stop lamp switch is applied.
The initialization sequence cycles each solenoid valve and the pump motor, as well as the necessary relays, for approximately 1.5 seconds to check component operation. The EBCM sets a DTC if any error is detected. The initialization sequence may be heard and felt while it is taking place, and is considered part of normal system operation.
The EBCM defines a drive cycle as the completion of the initialization sequence.
Antilock Brake System
When wheel slip is detected during a brake application, the ABS enters antilock mode. During antilock braking, hydraulic pressure in the individual wheel circuits is controlled to prevent any wheel from slipping. A separate hydraulic line and specific solenoid valves are provided for each wheel. The ABS can decrease, hold, or increase hydraulic pressure to each wheel brake. The ABS cannot, however, increase hydraulic pressure above the amount which is transmitted by the master cylinder during braking.
During antilock braking, a series of rapid pulsations is felt in the brake pedal. These pulsations are caused by the rapid changes in position of the individual solenoid valves as the EBCM responds to wheel speed sensor inputs and attempts to prevent wheel slip. These pedal pulsations are present only during antilock braking and stop when normal braking is resumed or when the vehicle comes to a stop. A ticking or popping noise may also be heard as the solenoid valves cycle rapidly. During antilock braking on dry pavement, intermittent chirping noises may be heard as the tires approach slipping. These noises and pedal pulsations are considered normal during antilock operation.
Vehicles equipped with ABS may be stopped by applying normal force to the brake pedal. Brake pedal operation during normal braking is no different than that of previous non-ABS systems. Maintaining a constant force on the brake pedal provides the shortest stopping distance while maintaining vehicle stability.
Pressure Hold
The EBCM closes the inlet valve and keeps the outlet valve closed in order to isolate the system when wheel slip occurs. This holds the pressure steady on the brake so that the hydraulic pressure does not increase or decrease.
Pressure Decrease
The EBCM decreases the pressure to individual wheels during a deceleration when wheel slip occurs. The inlet valve is closed and the outlet valve is opened. The excess fluid is stored in the accumulator until the return pump can return the fluid to the master cylinder.
Pressure Increase
The EBCM increases the pressure to individual wheels during a deceleration in order to reduce the speed of the wheel. The inlet valve is opened and the outlet valve is closed. The increased pressure is delivered from the master cylinder.
Engine Drag Control (EDC)
When the driver releases the throttle, and the drag from the engine overcomes the frictional force between the tire and the road, EDC becomes active.
The EBCM sends a torque request signal to the ECM, which increases the torque at the wheels. This stabilizes the wheels by reducing the slip at the driven wheels.
When EDC is active, the driven wheels are controlled to a target below the non-driven wheels.
Electronic Brake Distribution (EBD)
The electronic brake distribution (EBD) is a control system that replaces the hydraulic proportioning function of the mechanical proportioning valve in the base brake system. The EBD control system is part of the operation software in the EBCM. The EBD uses active control with existing ABS in order to regulate the vehicle's rear brake pressure.
The red brake warning indicator is illuminated when the dynamic rear proportioning function is disabled.
Traction Control System (TCS)
When drive wheel slip is noted while the brake is not applied, the electronic brake control module (EBCM) will enter traction control mode.
First, the EBCM requests the engine control module (ECM) to reduce the amount of torque to the drive wheels via the serial data. The ECM reduces torque to the drive wheels by retarding spark timing and turning off fuel injectors. The ECM reports the amount torque delivered to the drive wheels via the serial data circuit.
If the engine torque reduction does not eliminate drive wheel slip, the EBCM will actively apply the drive wheel brakes. During traction control braking, hydraulic pressure in each drive wheel circuit is controlled to prevent the drive wheels from slipping. The master cylinder isolation valve closes in order to isolate the master cylinder from the rest of the hydraulic system. The prime valve then opens in order to allow the pump to accumulate brake fluid in order to build hydraulic pressure for braking. The drive wheel inlet and outlet solenoid valves then open and close in order to perform the following functions:
• Pressure hold
• Pressure increase
• Pressure decrease
Traction Control Switch
Traction Control Switch Off, or Competitive Mode:
The Traction switch has multiple functions depending on the switch sequence applied. The Traction will be re-enabled by default when an ignition cycle is performed. When the Traction switch is pushed once, only the Traction control will be disabled. When the Traction switch is pressed twice within a 5 second time frame the EBCM will disable Traction and put the VSES into a Competitive mode which will limit VSES control. When the Traction switch is pressed and held for 5 seconds the Traction and VSES will be disabled
ABS Indicator
The instrument panel cluster (IPC) illuminates the Antilock Brake System (ABS) indicator when the following occurs:
• The electronic brake control module (EBCM) detects a malfunction with the antilock brake system. The IPC receives a serial data message from the EBCM requesting illumination.
• The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 5 seconds.
• The IPC detects a loss of serial data communications with the EBCM.
Traction Control System Indicator
TRAC OFF
The instrument panel cluster (IPC) illuminates the TRAC OFF indicator when the following occurs:
• The electronic brake control module (EBCM) inhibits the traction control system due to a malfunction in the traction control system. The IPC receives a serial data message from the EBCM requesting illumination.
• The body control module (BCM) detects that the traction control switch has been pressed (signal circuit is low). The BCM sends a serial data message to the EBCM in order to disable traction control. The IPC receives a serial data message from the BCM requesting illumination. The BCM sends a serial data message to the radio in order to activate an audible warning.
Vehicle Stability Enhancement System (VSES)
The vehicle stability enhancement system (VSES) adds an additional level of vehicle control to the EBCM.
Yaw rate is the rate of rotation about the vehicle's vertical axis. The VSES is activated when the EBCM determines that the desired yaw rate does not match the actual yaw rate as measured by the yaw rate sensor.
The desired yaw rate is calculated from the following parameters:
• The position of the steering wheel
• The speed of the vehicle
• The lateral, or sideways acceleration of the vehicle
The difference between the desired yaw rate and the actual yaw rate is the yaw rate error, which is a measurement of oversteer or understeer. If the yaw rate error becomes too large, the EBCM attempts to correct the vehicle's yaw motion by applying differential braking to the appropriate wheel. The amount of differential braking applied to the left or right front wheel is based on both the yaw rate error and side slip rate error.
The VSES activations generally occur during aggressive driving, in turns or on bumpy roads without much use of the accelerator pedal. When braking during VSES activation, the pedal pulsations feel different than the ABS pedal pulsations. The brake pedal pulsates at a higher frequency during VSES activation.
This vehicle is equipped with the MK 25 E Continental Teves antilock braking system.
The vehicle is equipped with the following braking systems:
• Antilock Brake System (ABS)
• Engine Drag Control (EDC)
• Electronic Brake Distribution (EBC)
• Traction Control System (TCS)
• Vehicle Stability Enhancement System (VSES) (w/JL4)
The following components are involved in the operation of the above systems:
• Electronic Brake Control Module (EBCM) - The EBCM controls the system functions and detects failures.
The EBCM contains the following components:
• Brake Pressure Modulator Valve (BPMV) - The BPMV contains the hydraulic valves and pump motor that are controlled electrically by the EBCM. The BPMV uses a 4 circuit configuration with a diagonal split. The BPMV directs fluid from the reservoir of the master cylinder to the left front and right rear wheels and fluid from the other reservoir to the right front and left rear wheels. The diagonal circuits are hydraulically isolated so that a leak or malfunction in one circuit will allow continued braking ability on the other.
Important: There is a rubber isolator located under the BPMV and on the mounting studs. The rubber isolators protect the BPMV and the EBCM from vehicle vibrations.
• The BPMV contains the following components:
- Pump Motor
- Inlet Valves (one per wheel)
- Outlet Valves (one per wheel)
- Master Cylinder Isolation Valves (one per drive wheel)
• The wheel speed sensor receives a 12-volt power supply voltage from the electronic brake control module (EBCM) and provides an output signal to the EBCM. As the wheel spins, the wheel speed sensor sends the EBCM a DC square wave signal. The EBCM uses the frequency of the square wave signal to calculate the wheel speed.
• Traction Control Switch - The TCS is manually disabled or enabled using the traction control switch.
• Brake Pedal Position - The EBCM uses the BPP sensor as an indication that the brake pedal is applied.
• Lateral Accelerometer Sensor (w/JL4) - The EBCM uses the lateral accelerometer sensor as an indication of the lateral acceleration of the vehicle.
• Yaw Rate Sensor (w/JL4) - The EBCM uses the yaw rate sensor as an indication of the yaw rate of the vehicle.
• Steering Wheel Position Sensor (SWPS) (w/JL4) - The EBCM uses the SWPS as an indication of the position and rotation of the steering wheel.
Initialization Sequence
The EBCM performs 1 initialization test each ignition cycle. The initialization of the EBCM occurs when 1 set of the following conditions occur:
• The EBCM detects that there is a minimum of 500 RPM from the ECM via a serial data message.
• The brake pedal position sensor is not applied.
OR
Both of the following conditions occur:
• The vehicle speed is greater than 16 km/h (10 mph).
• The stop lamp switch is applied.
The initialization sequence cycles each solenoid valve and the pump motor, as well as the necessary relays, for approximately 1.5 seconds to check component operation. The EBCM sets a DTC if any error is detected. The initialization sequence may be heard and felt while it is taking place, and is considered part of normal system operation.
The EBCM defines a drive cycle as the completion of the initialization sequence.
Antilock Brake System
When wheel slip is detected during a brake application, the ABS enters antilock mode. During antilock braking, hydraulic pressure in the individual wheel circuits is controlled to prevent any wheel from slipping. A separate hydraulic line and specific solenoid valves are provided for each wheel. The ABS can decrease, hold, or increase hydraulic pressure to each wheel brake. The ABS cannot, however, increase hydraulic pressure above the amount which is transmitted by the master cylinder during braking.
During antilock braking, a series of rapid pulsations is felt in the brake pedal. These pulsations are caused by the rapid changes in position of the individual solenoid valves as the EBCM responds to wheel speed sensor inputs and attempts to prevent wheel slip. These pedal pulsations are present only during antilock braking and stop when normal braking is resumed or when the vehicle comes to a stop. A ticking or popping noise may also be heard as the solenoid valves cycle rapidly. During antilock braking on dry pavement, intermittent chirping noises may be heard as the tires approach slipping. These noises and pedal pulsations are considered normal during antilock operation.
Vehicles equipped with ABS may be stopped by applying normal force to the brake pedal. Brake pedal operation during normal braking is no different than that of previous non-ABS systems. Maintaining a constant force on the brake pedal provides the shortest stopping distance while maintaining vehicle stability.
Pressure Hold
The EBCM closes the inlet valve and keeps the outlet valve closed in order to isolate the system when wheel slip occurs. This holds the pressure steady on the brake so that the hydraulic pressure does not increase or decrease.
Pressure Decrease
The EBCM decreases the pressure to individual wheels during a deceleration when wheel slip occurs. The inlet valve is closed and the outlet valve is opened. The excess fluid is stored in the accumulator until the return pump can return the fluid to the master cylinder.
Pressure Increase
The EBCM increases the pressure to individual wheels during a deceleration in order to reduce the speed of the wheel. The inlet valve is opened and the outlet valve is closed. The increased pressure is delivered from the master cylinder.
Engine Drag Control (EDC)
When the driver releases the throttle, and the drag from the engine overcomes the frictional force between the tire and the road, EDC becomes active.
The EBCM sends a torque request signal to the ECM, which increases the torque at the wheels. This stabilizes the wheels by reducing the slip at the driven wheels.
When EDC is active, the driven wheels are controlled to a target below the non-driven wheels.
Electronic Brake Distribution (EBD)
The electronic brake distribution (EBD) is a control system that replaces the hydraulic proportioning function of the mechanical proportioning valve in the base brake system. The EBD control system is part of the operation software in the EBCM. The EBD uses active control with existing ABS in order to regulate the vehicle's rear brake pressure.
The red brake warning indicator is illuminated when the dynamic rear proportioning function is disabled.
Traction Control System (TCS)
When drive wheel slip is noted while the brake is not applied, the electronic brake control module (EBCM) will enter traction control mode.
First, the EBCM requests the engine control module (ECM) to reduce the amount of torque to the drive wheels via the serial data. The ECM reduces torque to the drive wheels by retarding spark timing and turning off fuel injectors. The ECM reports the amount torque delivered to the drive wheels via the serial data circuit.
If the engine torque reduction does not eliminate drive wheel slip, the EBCM will actively apply the drive wheel brakes. During traction control braking, hydraulic pressure in each drive wheel circuit is controlled to prevent the drive wheels from slipping. The master cylinder isolation valve closes in order to isolate the master cylinder from the rest of the hydraulic system. The prime valve then opens in order to allow the pump to accumulate brake fluid in order to build hydraulic pressure for braking. The drive wheel inlet and outlet solenoid valves then open and close in order to perform the following functions:
• Pressure hold
• Pressure increase
• Pressure decrease
Traction Control Switch
Traction Control Switch Off, or Competitive Mode:
The Traction switch has multiple functions depending on the switch sequence applied. The Traction will be re-enabled by default when an ignition cycle is performed. When the Traction switch is pushed once, only the Traction control will be disabled. When the Traction switch is pressed twice within a 5 second time frame the EBCM will disable Traction and put the VSES into a Competitive mode which will limit VSES control. When the Traction switch is pressed and held for 5 seconds the Traction and VSES will be disabled
ABS Indicator
The instrument panel cluster (IPC) illuminates the Antilock Brake System (ABS) indicator when the following occurs:
• The electronic brake control module (EBCM) detects a malfunction with the antilock brake system. The IPC receives a serial data message from the EBCM requesting illumination.
• The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 5 seconds.
• The IPC detects a loss of serial data communications with the EBCM.
Traction Control System Indicator
TRAC OFF
The instrument panel cluster (IPC) illuminates the TRAC OFF indicator when the following occurs:
• The electronic brake control module (EBCM) inhibits the traction control system due to a malfunction in the traction control system. The IPC receives a serial data message from the EBCM requesting illumination.
• The body control module (BCM) detects that the traction control switch has been pressed (signal circuit is low). The BCM sends a serial data message to the EBCM in order to disable traction control. The IPC receives a serial data message from the BCM requesting illumination. The BCM sends a serial data message to the radio in order to activate an audible warning.
Vehicle Stability Enhancement System (VSES)
The vehicle stability enhancement system (VSES) adds an additional level of vehicle control to the EBCM.
Yaw rate is the rate of rotation about the vehicle's vertical axis. The VSES is activated when the EBCM determines that the desired yaw rate does not match the actual yaw rate as measured by the yaw rate sensor.
The desired yaw rate is calculated from the following parameters:
• The position of the steering wheel
• The speed of the vehicle
• The lateral, or sideways acceleration of the vehicle
The difference between the desired yaw rate and the actual yaw rate is the yaw rate error, which is a measurement of oversteer or understeer. If the yaw rate error becomes too large, the EBCM attempts to correct the vehicle's yaw motion by applying differential braking to the appropriate wheel. The amount of differential braking applied to the left or right front wheel is based on both the yaw rate error and side slip rate error.
The VSES activations generally occur during aggressive driving, in turns or on bumpy roads without much use of the accelerator pedal. When braking during VSES activation, the pedal pulsations feel different than the ABS pedal pulsations. The brake pedal pulsates at a higher frequency during VSES activation.
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