Firebird V8-5.7L VIN G (2001)
Traction Control (TCS) NW9
Traction control will not have any effect on the operation of the vehicle until the control module detects one or both of the rear wheels rotating faster
than the front wheels. At this time the Electronic Brake and Traction Control Module (EBCM) will request the Powertrain Control Module (PCM) to
retard timing. If the EBCM continues to detect the rear wheel are rotating faster than the front it will request the ASM to reduce the throttle angle. The
last measure taken to control the rear wheel is for the EBCM to apply the rear brakes, thus reducing torque to the rear wheels. Once the rear wheels
begin to rotate at the same speed as the front wheels, the system will return full control to the driver. During Traction Control mode, if the brake is
applied to only one rear wheel, most of the torque from the engine will be directed to the other rear wheel which will improve the traction of the
vehicle.
The braking is accomplished by closing the TCS Master Cylinder Isolating Valve, this isolates the master cylinder from the rest of the system. The
TCS Prime valve opens to allow the pump to get brake fluid to build pressure for braking. The drive wheel circuit solenoids are energized as needed to
allow for pressure hold, pressure increase, or pressure decrease.
The TCS may be deactivated by the driver if desired. In order to deactivate the TCS with the engine running, depress the TCS On/Off switch. The
system will remain deactivated until the ignition switch is, cycled, or the switch is pressed again.
ABS Indicator
The IPC illuminates the ABS indicator when the following occurs:
-
The electronic brake control module (EBCM) detects a malfunction with the antilock brake system. The IPC receives a class 2 message from the
EBCM requesting illumination.
-
The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
-
The IPC detects a loss of class 2 communications with the EBCM.
Brake System Indicator(s)
Brake Warning Indicator
The IPC illuminates the BRAKE indicator when the following occurs:
-
The PC detects that the park brake switch is, closed (park brake set).
-
The IPC detects a low brake fluid condition.
-
The IPC performs the displays test at the start of each ignition cycle.
-
The EBCM senses a base brake failure.
-
The IPC detects a loss of class 2 communications with the EBCM.
Traction Control System Indicator(s)
Low Trac Indicator
The IPC illuminates the Low Trac indicator when the following occurs:
-
The electronic brake control module (EBCM) detects a traction control event (either ABS active or traction control system active). The IPC
receives a class 2 message from the EBCM requesting illumination.
-
The IPC performs the displays test at the start of each ignition cycle.
TCS Off Indicator (Pontiac) or ASR Off Indicator (Chevrolet)
The IPC illuminates the indicator when the following occurs:
-
The electronic brake control module (EBCM) inhibits the traction control system. The IPC receives a class 2 message from the EBCM requesting
illumination.
-
The TCS is off.
-
The TCS has failed.
-
The IPC detects a loss of class 2 communications with the EBCM.
