Antilock Brakes / Traction Control Systems: Application and ID

Definitions
These explanations concern this assembly group- Self-diagnosis for ABS. These definitions are not necessarily generally valid.

ABS/EDL/ASR/ESP
Anti-lock braking system, electronic differential lock, traction control system, electronic stability program.

Display group number, Read measured value block

ASR (Traction control system)
Further information on this can be found in the appropriate Self-study program No. 115.

Booster
Brake servo

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

Data bus low (high)
The voltage used to transport the data is low (high).

Speed sensor
Sends speed signals to control module.

EBD
Electronic brake pressure distribution

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.

Self-diagnosis
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.

Performing self-diagnosis
Connecting the Scan Tool to be able to check the DTC memory.

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

ESP
Electronic stabilization program

ESP-Sensor Unit -G419-, vehicles from m.y. 12.01
The sensor for transverse acceleration -G200-, and the sender for rotation rate -G202- are assembled together in a housing.

Sender 1 for brake booster/sensor -2- for brake pressure -G201/-G214
Registers the pressure exerted by the driver and is required to control the pressure of the pre-charge pressure (booster).

Sender for rotation rate -G202
Registers the rotational movement of the vehicle along the vertical axis relative to the speed of the vehicle.

Steering angle sensor -G85
Used to determine the direction the driver desires. Data transfer to control module is via the data bus wiring.

Sensor for transverse acceleration -G200
Used to register the speed through curves/bends and which side should be braked using the ESP.

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

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.

Trip switch
The trip switch is located in the brake booster and is used by the control module to determine the braking desired by the driver which then leads to the switch-off of the brake pressure (booster) solenoid valve.

Magnetic coil for brake pressure, in brake booster -N247
The brake pressure (booster) solenoid valve is located in the brake booster and is used to provide the pressure required for the precharging (by increasing the suction pressure) 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 fault finding and fault rectification. 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

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

Sporadic
Happens occasionally

Infinity (Ohms)
The resistance is infinite, open circuit.