Chevrolet Cobalt Service & Repair Manual: Operation
| The desired yaw rate is calculated
from the position of the steering wheel, the speed of the vehicle and 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 (Anti-Lock Brake System) pedal pulsations.
The brake pedal pulsates at a higher frequency during VSES activation. |
| When traction control switch is
pressed twice within a 5 second time frame the EBCM will disable Traction
and put the vehicle stability enhancement system into a competitive mode
which will limit Vehicle Stability Enhancement System control. When Traction
switch is pressed and held for 5 seconds Traction and Vehicle Stability
Enhancement System will be disabled. Traction switch has multiple functions
depending on switch sequence applied. Traction will be re-enabled by default
when an ignition cycle is performed. |
The VSES (Vehicle Stability Enhancement
System) adds an additional level of vehicle control to the EBCM (Electronic
Brake Control Module). The EBCM controls the system functions and det ...
Initialization Sequence
The EBCM performs one initialization
test each ignition cycle. The initialization of the EBCM occurs when the
EBCM detects the there is a minimum of 500 RPM fro ...
See also:
Chevrolet Cobalt Service & Repair Manual. Leak Test
Before beginning any leak test,
attach a manifold gauge set and note pressure. If little or no pressure
is indicated, a partial charge must be installed. Inspect all connections,
compressor head gasket, oil filler plug and compressor shaft seal for leaks.
Electronic Leak Det ...
Description
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