Acceleration skid control (ASR)

Acceleration skid control prevents the drive wheels from spinning when the vehicle pulls away or accelerates, regardless of the road conditions.

Activating ASR

If the indicator lamp does not go out:

have the fault rectified at a qualified specialist workshop which has the necessary specialist knowledge and tools to carry out the work required.

Mercedes-Benz recommends that you use a Mercedes-Benz Service Centre for this purpose. All work relevant to safety or on safety-related systems must be carried out at a qualified specialist workshop.

Driving with ASR

If the drive wheels start to spin on one or both sides of the vehicle, ASR is activated automatically.

The indicator lamp in the instrument cluster lights up.

If the drive wheels spin on one side, ASR brakes them automatically.

If the drive wheels spin on both sides, ASR automatically reduces engine power output.

It is not possible to activate cruise control or the cruise control continuous brake during ASR intervention.

If cruise control has already been activated, it will remain active. However, it is not possible to accelerate or decelerate using the cruise control function.

If you experience traction problems when driving with snow chains or when driving on loose surfaces (e.g. sand or gravel), deactivate ASR.

Deactivating ASR

ASR deactivation switch

Reactivating ASR

After stopping and restarting the engine, ASR is automatically reactivated.

Differential locks

Engage the differential lock if required, e.g. on slippery road surfaces or off-road.

Engaging/disengaging the differential lock

Switched off Inter-axle lock Cross-axle lock, rear axle

6x4, 8x4 vehicles (example)

The individual differential locks can only be engaged in sequence.

Engaging

The display shows the corresponding indicator once the engagement process is finished.

Disengaging

Power take-offs

Power take-offs are intended for driving auxiliary equipment. The engine and power take-offs must be operated with a certain engine speed (working speed), depending on conditions of use.

Status indicator Differential lock/power take-off indicator

Example of display (basic display)

Power take-off - specifications

• Transmission-driven power take-off

  The power take-off can only be engaged when the vehicle is stationary, the parking brake is applied, the engine is running and the transmission is in neutral. When a gear is engaged, the power take-off cannot be engaged.

• Camshaft-driven power take-off:

  The power take-off is only operational while the engine is running and cannot be engaged.

Shift locks

• Transmission with shift lock:

  The transmission cannot be operated when the power take-off is engaged.

• Transmission without shift lock:

  The power take-off can be operated when the vehicle is stationary or when it is travelling in 1st, 2nd or 3rd gear. Do not change gear while the vehicle is in motion.

Preselecting the working speed

Engaging/disengaging power take-off

Power take-off switch

Engaging transmission-driven power take-offs

With the vehicle stationary, the parking brake applied, the engine running (idle speed) and the transmission in neutral:

Disengaging transmission-driven power take-offs

With the engine running at idle speed:

Automatic transmission with shift lock release:

The vehicle can be driven while the power take-off is activated.

Switching on the power take-off while driving

Switch for shift lock release

With the vehicle stationary, the parking brake applied and the transmission in neutral (N):

Travel position button

Power take-off pedal

Switching off the power take-off while driving

Reactivating the power take-off while the vehicle is stationary

Speed limiter and reverse gear lock

Refuse-collection vehicle:

If the running boards at the rear end of the vehicle are loaded, the vehicle speed is automatically limited to a maximum of 30 km/h. Reverse gear is simultaneously disabled (reverse gear lock).

If you select reverse gear when the reverse gear lock is activated, a warning buzzer sounds. In addition, the engine is automatically switched off and the frequent-stop brake is automatically engaged.

Deactivating the reverse gear lock

Vehicles with programmable special module (PSM)

If the parking brake is released, the power take-off cannot be engaged.

appears in the display. At the same time, the status indicator will light up yellow.

If flashes in the display, the power take-off cannot be switched on.

The electronic management system has not automatically recognised the vehicle's current operating state (transmission in neutral, vehicle stationary and parking brake applied).

If flashes in the display again, visit a qualified specialist workshop. Mercedes-Benz recommends that you use a Mercedes-Benz Service Centre for this purpose.

Engine speed setting

To drive auxiliary equipment, e.g. hydraulic pumps, the engine must run at a certain speed (working speed). The engine speed can be changed, depending on the vehicle equipment, by using:

• the accelerator pedal

• the multi-function lever on the steering column

• the constant engine speed switch

Power take-off with speed limiter: when the power take-off is engaged, the set working speed cannot be exceeded.

Power take-off with fixed working speed: if the gear is changed, the power take-off switches off automatically.

Power take-off (engine power take-off at the rear) with elasticated coupling: with a fully loaded power take-off, never allow engine speed to drop below 750 rpm.

Constant engine speed

When the constant engine speed function is switched on, the programmed power take-off working speed is controlled automatically, regardless of the load.

Constant engine speed switch

The constant engine speed function can only be activated when the vehicle is stationary, the parking brake is applied, the transmission is in the neutral position and the power take-off is engaged.

Cold-start aid

The cold-start aid makes it easier to start the engine at low outside temperatures (below -15 ); it is already activated at outside temperatures below -4 .

Activating cold-start aid

The cold-start aid is automatically deactivated if:

• the engine is not started within 30 seconds of the indicator lamp going out

• the engine is started when the indicator lamp is lit

• the coolant temperature reaches about 0 while the engine is running.

When the coolant temperature is above approximately -4 the indicator lamp goes out after approximately 2 seconds (function check).

At a coolant temperature of below approximately -4 , the indicator lamp goes out after approximately 20 seconds.

A malfunction in the cold-start aid is indicated in the display by a display message with a yellow status indicator and the system abbreviation FLA. Have the cold-start aid checked and repaired at a qualified specialist workshop.

Mercedes-Benz recommends that you use a Mercedes-Benz Service Centre for this purpose. All work relevant to safety or on safety-related systems must be carried out at a qualified specialist workshop.

Idling speed

After the engine has started, the idle speed is controlled automatically according to the coolant temperature.

The idle speed is about 600 rpm with the engine at normal operating temperature.

The idle speed can be adjusted using the multi-function lever on the steering column. This makes it possible to drive auxiliary equipment such as pumps at their working speed.

Setting the idle speed

The multi-function lever on the steering column can be used to set the idle speed to between about 600 rpm and a maximum of 800 rpm when the vehicle is stationary.

To increase idle speed To reduce idle speed To deactivate idle speed control

The engine runs at the idle speed set as soon as you release the multi-function lever.

The change in idle speed is automatically cancelled after the vehicle has pulled away (at faster than approximately 20 km/h).

Increasing the idle speed

Reducing the idle speed

Deactivating the idle speed control