Actual Values (ABS and ABS/ABD)

This menu (function) allows the following actual values to be checked:

- Stop light switch

- Valve relay

- Return pump

- Speed (Wheel speed / Check is possible for speeds of up to 19 km/h)

Front left
Front right
Rear left
Rear right

Terminal 61

- Throttle (Does not exist on solo ABS system)

Re: Stop light switch:

Operate brake pedal.

Specified display: Shift from open to closed.

Re: Valve (solenoid) relay:

With the ignition switched on and with the engine running and the system in good condition, the following display appears: ,,Valve relay tightened' (picked up).

Re: Return pump:

Display: Return pump not activated (Display would read activated if pump is running).

Re: Speed:

Use select button (function key) to select the desired wheel.

Wheel speed is displayed in km/h and mph (depending on wheel rpm).

If function key 1 is also pressed, the values for all wheels are displayed.




Example: Front left wheel




Example: All wheels

The wheels are assigned as follows on this display:

Left front wheel = Right front wheel
2 top left blocks 2 top right blocks

Left rear wheel = Right rear wheel =
2 bottom left blocks 2 bottom right blocks

Procedure

2 checks are possible if the speed sensor signal is monitored.

Check 1 with raised vehicle. (Accidental interchanging of speed sensors and speed sensor signal quality check).

Check 2 during straight-ahead driving at approx. 2-4 km/h

(Signal quality of individual wheels is compared). Check 2 provides better conclusions on signal quality than check 1.

Re: Check 1

To check, manually rotate left front wheel steadily at approx. 2 to 3km/h (observe tester display).. Increase speed slowly and observe speed increase (display) at the same time.

specifications specifications display Speed increments of approx. 0.06 km/h. Initial display at 1.75 km/h. This means: The subsequent value must exceed the value measured last by 0.06 km/h or must be 0.06 km/h below this value when the wheel is rotated slower.

In some cases, the tester rounds the value down to 0.05 km/h or up to 0.07 km/h.

Example

First measured value = 1.81 km/h
Second value as specified = 1.87 km/h
Third specified value = 1.93 km/h
etc.

Note

Lock the opposite wheel (to prevent from rotating) when checking the wheels on the rear axle.

On four-wheel drive vehicles, the three other wheels must be locked during this check.

Re: Check 2

Select all 4 wheels on tester display by additionally pressing tester button 1 (function key 1).

Drive smoothly at approx. 2-4 km/h in a straight-ahead direction and have a helper observe the tester display.

Specification: Wheel speeds of all four wheels must not deviate from each other by more than 1 km/h.

Re: Signal of terminal 61

Specified display:
Engine stopped - Signal not present
Engine running - Signal present

Re: Throttle signal:

Precondition: Engine runs. Throttle position is displayed as a percentage. Display changes according to throttle position when the accelerator is depressed.