Anti-Lock Control - Stability Assist

1-----Yaw rate sensor and accelerometer

2-----Steering wheel rotation sensor

3-----Hydraulic control unit (HCU) and stability assist module assembly

The stability assist module adds a further function known as electronic stability program (ESP) to the anti-lock brake system (ABS) and includes a traction control function. Whereas the ABS prevented wheel lock up during braking, the traction control function controls wheel slip during acceleration (longitudinal dynamics) and the ESP stabilizes the vehicle about its vertical axis.
Sensors measure the position of the steering wheel, the pressure in the brake master cylinder, the yaw velocity (yaw rate) and the acceleration transverse to the vehicle (lateral acceleration). This makes it possible to compare the driver's intention with the momentary vehicle behaviour so that in the event of the vehicle becoming unstable, ESP can initiate the appropriate corrective action.
The ESP recognizes critical driving conditions, such as panic reactions in dangerous situations, and stabilizes the vehicle, within the physical limits, by individually braking each wheel and giving engine control intervention without need for the driver to actuate the brake or the accelerator pedal.
Stability assist components
The ESP uses the same components as the ABS program with the addition of the following:
* Stability assist module: This is attached to the HCU and is fitted instead of the ABS module. The stability assist module carries out the same function as the ABS module.
* Yaw rate sensor and accelerometer: This sensor cluster combines the yaw rate and the lateral acceleration sensors in a single component. The sensor is attached the floor crossmember.

NOTE: Since September 16, 2010 the yaw rate sensor and accelerometer function is part of the restraints control module (RCM)

* Steering wheel rotation sensor: This sensor measures the rotation of the steering wheel. It is attached to the clockspring and is located on the steering column.

ACTIVE CURVE SYSTEM - Like Driving on Rails

The active roll stabilisation of the Mercedes-Benz ACTIVE CURVE SYSTEM boosts driving comfort significantly: When cornering, the stabiliser bars are actively impacted and keep the torsional moment constant.

Enlarge   ACTIVE CURVE SYSTEM

Enlarge   ACTIVE CURVE SYSTEM The roll distribution is variable to enable the vehicle to be adapted to almost any situation. The driver has the feeling of gliding on rails, particularly in vehicles with a high centre of gravity.

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	ACTIVE CURVE SYSTEM

In off-road environments, the system guarantees improved axle roll by decoupling the two stabiliser bars at the front and rear axles.

DISTRONIC PLUS: Warns and Assists The Driver

Inadequate following distances, inattentiveness on the part of the driver and unexpected, abrupt traffic standstills are the most common causes of rear-end collisions. Radar-based DISTRONIC PLUS adaptive cruise control provides a remedy here.

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DISTRONIC PLUS

The system keeps you automatically at a distance from the vehicle in front and makes a major contribution towards minimising the risk of rear-end collisions by identifying potentially dangerous situations and responding accordingly.

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Enlarge DISTRONIC PLUS The cutting-edge radar technology employed by DISTRONIC PLUS monitors the situation ahead of the car and is able to recognise an impending accident. Behind the front bumper panels there are two short-range radar sensors covering a range from 20 cm to 30 metres and a scanning angle of 80 degrees. The long-range radar is concealed behind the radiator grille. A special drum technology enables both long- and mid-range coverage. The system has a long-distance range of 200 m at a scanning angle of 18° and a mid-distance range of 60 m at a scanning angle of 60°.

Enlarge The DISTRONIC PLUS proximity control has an operating range of 0.2 to 150 metres and is capable of braking the car all the way to a standstill and accelerating it back up to the pre-set desired speed, if the traffic situation permits. DISTRONIC PLUS brakes the vehicle automatically in stop-and-go traffic, bringing it to a standstill if necessary. Automatic braking is carried out at a deceleration rate of up to 4 m/sec2. As soon as the traffic situation allows, DISTRONIC PLUS accelerates up to the set speed again, relieving the driver of tiring routine activities involving repeated moving off and subsequent braking in stop-and-go or bumper-to-bumper traffic.

If DISTRONIC PLUS detects that heavier braking is necessary, an intermittent warning tone will sound and a warning symbol will light up in the instrument cluster. These two warnings prompt the driver to exercise special caution and to apply the brakes himself, if necessary. To move off again after coming to a complete standstill, the cruise control lever must be lifted or the accelerator pedal tapped.

The speed set by the driver is shown on the display when DISTRONIC PLUS is active. When a relevant vehicle is recognised in the radar detection range, its speed is also shown on the display. A distance display can also be called up.

ABS SENSOR TEST

The ABS No obvious magnetic sensors checkAfter Halloween , it is the anti-lock brake problems haunt our garages. Why ? As the sensors are the key elements of the system, they are also the most likely to default . The snow mixed with salt gives a saltwater solution that puts to the test the speed sensor wheel, particularly inductive (magnetic) sensor .Text size bigger text smaller text2008-11-01

Merely enter the vehicle heat will melt the snow on the suspension components . The mixed salt water to seep into the smallest cracks sensors to betray management system . When the vehicle is delivered to the customer , the ABS warning light could suddenly turn .
And now back to the studio, not happy at all !
The management system is the first verification of these sensors when the ignition is switched to "on" ( key ON) . The management system then checks if the sensors have a voltage leakage to ground. This is made possible by a low voltage (about 2.5 volts to 5 volts) sent by the brake module and which is present at each sensor . If a sensor has a leakage to ground, the voltage will fall slightly and will be interpreted by the module as a non-functioning sensor .
Strangely , the technician , if a controller analyzer is used to make a diagnosis , the speed of the four wheel speed sensors is normal (Fig. 1 ) .
The speed is uniform over the four sensors and the deceleration thereof is at the same time . If this is the case , check whether a sensor is grounded ( see table) .
The resistance of a sensor is to be taken when a code disorders us there . It is rare ( but still possible) to detect a problem with this type of verification ( Figure 2).
The reference voltage should be checked before replacing a sensor. It is too easy to blame a sensor without first checking what is conveyed by the thread. In some cases, the wire core is attacked ( Figure 3). Instead of copper color , the wire core is black and dull.
If you encounter this case , you must change the thread in full. If you try to replace only a section, you will find it difficult to solder the wire and again, the resistance created mislead management system brakes.
If you are very attentive at given by the wheel speed sensor signal , it is possible to note that a speed sensor becomes zero km / h before the other (FIG. 4 ) Normally , it is to be demagnetized , or restraint was warped .

In the latter case , if a sensor is more distant than the other , it affects the amplitude of the signal . The management module may issue a code of disorders, but in most cases , the customer will complain that the ABS brakes are activated at the end of normal braking without wheel lock .
Why is it important to do all these checks ? 'll See a short summary of a Ford service bulletin : 04 - 26-7 (source: Shopkey5 ) for a Crown Victoria, Grand Marquis, 2002-04, "char police " par excellence.
Some vehicles may have more dia

Audio unit removal (TRANSIT)

Removal and Installation

General Equipment

Audio unit removal tools (GV3301)

Worldwide Diagnostic System (WDS)

NOTICE: If the navigation system display module is to be removed for testing or new component installation, remove any audio media (if possible) from within the navigation system display module and return it to the customer. Failure to follow this instruction may result in damage to the navigation system display module.

NOTE: When installing the audio unit removal tools, make sure that the wording on the audio unit removal tools is followed, TOP L (left-hand) indicates the top of the tool, left-hand side of the removal tool and TOP R (right-hand) indicates the top of the tool, right-hand side of the removal tool.

1. Remove the components in the order indicated in the following illustration(s) and table(s).

Item

Part Number

Description

1

-

Audio unit removal tools

2

-

Navigation system display moduleSee Removal Detail
See Installation Detail

3

-

Antenna cable

4

-

Global positioning system (GPS) antenna cable

5

-

Navigation system display module electrical connector
See Removal Detail

NOTE: Remove the audio unit removal tools from the navigation system display module before installing the original navigation system display module.

NOTE: When installing a new navigation system display module, the navigation system display module must be configured by selecting the Programmable Module Installation Routine on WDS.

2. To install, reverse the removal procedure.

3. NOTE: If a new navigation system display module is installed, the NEW INSTALLATION menu must be followed.
   NOTE: Make sure the navigation system CD ROM is installed in the navigation system display module before entering the NEW INSTALLATION menu.
   Switch the navigation system display module ON.

4. NOTE: It is necessary to carry out part of the system diagnosis outside of the workshop. Make sure there are no large buildings/obstructions or metal objects in the immediate vicinity.
   With the navigation system display module in the navigation main menu. PRESS the S6 (EXTRA) button.

5. SELECT NEW INSTALLATION and PRESS the right-hand rotary knob (ENTER), to continue to the next screen.

6. Follow the instructions on the display, until calibration is confirmed in the display.

Removal Details

Item 2 : Navigation system display module

1. NOTICE: When detaching the navigation system display module, do not place excessive strain on the wiring harness.
   Detach the navigation system display module from the instrument panel.

Item 5 : Navigation system display module electrical connector

1. Disconnect the navigation system display module electrical connector.
   • Release the locking tangs.

Installation Details

Item 2 : Navigation system display module

NOTICE: The navigation system display module wiring harness and antenna cable must not become trapped when installing the navigation system display module.

1. The navigation system display module rear support must engage with the audio unit support bracket.

hall effect sensor

a Hall effect sensor is a sensor that will allow to measure (detect) a change in electromagnetic field, a magnet or a piece of iron magnet (or not) causes a change in the magnetic field, or disturbance power a piece of iron
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