Terms
Helps prevent the wheels from locking during sudden braking, especially on slippery surfaces.
What is antilock brake system?
The ABS that requires the use of four wheel speed sensors.
What is four channel?
Another name for passive wheel speed sensor.
What is variable reluctance (VR) and/or magnetic?
When the rear wheels loose traction and the vehicle can spin out of control.
What is oversteering?
The sensor used by ESC controller to determine the drivers intended direction.
What is the Steering Wheel (hand-wheel) position sensor?
There are two types of Active Wheel Speed Sensors.
What is Hall effect and Magneto Resistive (MR)
the antilock braking system that controls each front wheel as a separate channel but controls both rear wheels together as a single channel.
What is a three-channel antilock braking system?
Another name for active wheel speed sensor.
What is hall-effect and/or magneto resistive (MR)?
A test preformed to verify that the electronic stability control system can operate correctly and keep the vehicle under control.
What is the sine and dwell test?
The ESC system requires the vehicle be equipped with this type of brake system.
What is Four-Channel ABS?
These have a conventional brake master cylinder and vacuum power booster with a separate hydraulic modulator unit
What is nonintegral ABS?
The three stages of ABS operation.
What is pressure increase, pressure hold, and pressure reduction?
What are wheel speed sensors?
Two other names used to identify an ESC system.
Another name for electronic stability control system.
What is Vehicle Stability Assist (VSA), Electronic Stability Program (ESP) or Vehicle Dynamic Control (VDC)?
This type of module receives wheel speed information from the wheel speed sensors and then sends a voltage signal to the control solenoids which then controls brake fluid pressure at the wheel brakes.
What is a control module?
The standard test that is preformed to verify ESC operation.
What is Sine and Dwell?
Traction control uses the antilock brake system and other devices to limit this, of the drive wheels during acceleration.
What is Positive Slip?
4 sensors used in most Electronic Stability Control systems.
What is, steering wheel sensor, vehicle speed sensor, lateral acceleration sensor, and yaw rate sensor?
This colour of ABS warning lamp usually comes on after a vehicle start up, during the initialization or start-up self-test sequence. If it stays on after the vehicle is started, this could mean a fault in the ABS system has been detected.
What is amber light?
The difference between the actual speed and the rate at which the tire tread moves across the ground.
What is Tire slip?
A red brake warning lamp (RBWL) could mean this.
Low brake fluid level
Low pressure in half of the hydraulic system
The parking brake is applied
ABS failure
Low brake pressure on integral system
These are the 6 steps of a diagnostic procedure.
Step 1 - Verify customer concern
Step 2 - Preform visual inspection
Step 3 - Check for stored diagnostic trouble codes (DTCs)service bulletins (TSBs)
Step 4 - Check for technical
Step 5 - Determine the root cause.
Step 6 - Complete repair
This can be used to check for proper wheel speed sensor operation.
What is a multimeter (DMM)? (checks for resistance and AC voltage output.
This type of scan tool is needed to retrieve data from the antilock brake system.
What is Factory scan tool or Enhanced factory-level scan tool?