Antilock Brakes / Traction Control Systems: Application and ID

Definitions
These explanations refer only to this assembly group: ABS On Board Diagnostic (OBD). These definitions are not necessarily generally valid.

ABS
Anti-locking brake system.

Display group number

ASR
Traction Control System

Data bus
Transportation of data. To do this the electrical signals are brought into a certain format (BUS). Also called CAN Bus.

Data bus low (high)
The voltage used to transport the data is low (high). Further information can be found in Self-study programs.

Speed sensor
Sends speed signals to control module.

EBD
Electronic brake pressure distribution

EDL
Electronic differential lock

On Board Diagnostic (OBD)
The capability of the control module:
^ Recognize Diagnostic Trouble Codes (DTCs)
^ React to DTCs
^ Store DTCs

and make them available in the Measured value block. Further information on this can be found in test unit instruction manual.

Performing On Board Diagnostic (OBD)
Connecting the Scan Tool to be able to check the DTC memory. Further information on this can be found in test unit instruction manual.

Performing electrical check
A targeted check of the electronic components by performing certain measurements.

ESP
Electronic Stabilization program

ESP-Sensor unit -G419-, vehicles from 02.02
The sensor for transverse acceleration -G200-, the sender for rotation rate -G202- and the sensor for longitudinal acceleration sensor -G251- (4MOTION vehicles) are assembled together in a housing.

No communication
There is no connection for exchanging information between the control modules.

Sender for rotation rate -G202-
Recognizes the rotational movement of the vehicle along its vertical axis in relation to vehicle speed.

Longitudinal acceleration sensor -G251-
Determines the correct speed for 4MOTION vehicles

Steering angle sensor -G85-
Determines the angle and direction of steering lock (driver's wish). Data is transferred to control module via data bus wiring.

Short to Ground
Current flows incorrectly to Ground without supplying a consumer.

Short to positive
Current flows incorrectly to a live component without supplying a consumer.

Brake pressure release solenoid -F84-
The trip switch is installed in the brake booster and is required by the control module to recognize the braking desired by the driver.

Magnetic coil for brake pressure, in brake booster, -N247-
The brake pressure solenoid is installed in the brake booster and ensures that a pre-pressure of 10 bar is available for the ABS/ESP pump.

Read measured value block
The control module can transfer a considerable amount of test data. This test data delivers information on the operational condition of the system and/or sensors connected to it. In many cases the transferred test data supports troubleshooting and malfunction repair. The test data has been summarized into single display groups because all the information cannot be evaluated at the same time. The information can be selected via display group numbers.

EBC
Engine braking control

Sensor for transverse acceleration -G200-
The lateral acceleration sensor is used to register the speed through curves/bends on the road and decides which side of the vehicle the ESP is to brake.

Sender 1 for brake booster/Sensor -2- for brake pressure -G201-/-G214-
Recognizes the pressure exerted by the driver and is required to control the pressure of the pre-pressure system.

Program card version
Always use the most up-to-date program card. Further information can be found in the test unit operating instructions.

Sporadic
Happens occasionally

Infinity
The resistance is infinite, open circuit.

The omega symbol is used to symbolize Ohms or infinity.

Forget-malfunction counter
When a fault gets in the memory fault counter, after 50 vehicle starts, and this fault is not repeated again, the memory counter erases the fault.