E 320 4MATIC Wagon (210.282) V6-3.2L (112.941) (1998)
/v6-3.2l_(112.941)/Page-75012.png)
To adapt to the various engine variants, manual or automatic transmission and different versions of the rear axle brake calipers, control modules must be
coded with the Hand-Held Tester after installation in the vehicle variant concerned.
The ETS/SPS control module is divided up functionally as follows:
-
Signal conditioning
-
Logic section
-
Safety circuit
-
Additional functions
-
Signal conditioning
The following input signals are conditioned for the logic section:
-
4 speed sensors
-
Stop lamp switch, 4-pin
-
Terminal 61
-
Logic section
The conditioned input signals are processed in the logic section and converted into output signals.
The logic section is divided up functionally as follows:
-
ETS control mode
-
Starting-off control logic (manual transmission)
-
Temperature monitoring
ETS control mode
The control mode for brake intervention on one side is recognized from the vehicle speed and ETS slip recognition between the left and right drive
wheel.
Switching on condition: Speed difference between the left and right rear wheel > 4 km/h
Switching off condition: Speed difference between the left and right rear wheel=2 km/h below the switching-on threshold.
Speed range: 0-40 km/h
If the switching on condition is maintained above 40 km/h during an acceleration process, the control mode is continued up to max. 80 km/h.
The control mode for brake intervention on both sides is recognized from the vehicle speed/cornering and ETS slip recognition.
Switching on condition: Both rear wheels at least 2.8 km/h faster than the vehicle speed
-
Cornering recognition: Speed difference between the left and right front wheel > 1 km/h
-
speed range=15-80 km/h On period: max. 2 seconds
Starting-off control logic (manual transmission)
A starting-off logic circuit is integrated into the ETS/SPS control module to prevent the engine "stalling" due to brake intervention when starting off.
Depending on the vehicle speed,a mean minimum rear axle speed (= theoretical minimum engine speed) is specified which depends on the current ETS
