The oil pressure sensors detect the shift state of the gearbox and send a signal to the EGS control unit to confirm this status.
The oil pressure sensors are pressure switches that register any applied hydraulic pressure. The oil pressure sensors are installed in the valve block of the hydraulic control unit (hydraulic selector unit).
Index |
Explanation |
Index |
Explanation |
|---|---|---|---|
1 |
Electronic module |
2 |
Hydraulic unit |
3 |
Oil pressure sensor E |
4 |
Oil pressure sensor C |
5 |
Oil pressure sensor A |
6 |
Oil pressure sensor D |
The following system function is described:
When no hydraulic pressure is applied, the oil pressure sensors are closed, i.e., current flows through the sensors.
When hydraulic pressure is applied, the circuit is interrupted by the oil pressure sensors and no current flows. This results in different pressure states at the oil pressure sensors, depending on the shift mode of the gearbox. The electrical signals are sent to the EGS control unit.
Switching logic |
||||
|---|---|---|---|---|
|
Pressure applied to switch |
Switch status |
Logic |
Electrical signal |
Clutch operated |
No |
Closed |
0 |
0 Volts |
Clutch disengaged |
Yes |
Open |
1 |
12 Volts |
Switching logic of the oil pressure sensors |
||||
|---|---|---|---|---|
Oil pressure sensors |
||||
Selector-lever position |
A |
C |
D |
E |
|
0 = hydraulic pressure not applied |
|||
P |
1 |
0 |
0 |
0 |
R |
0 |
0 |
0 |
0 |
N |
1 |
0 |
0 |
0 |
D/1 |
1 |
1 |
0 |
1 |
D/2 |
1 |
0 |
0 |
1 |
D/3 |
0 |
1 |
0 |
1 |
D/4 |
1 |
1 |
0 |
0 |
D/5 |
0 |
1 |
1 |
0 |
D/6 |
1 |
0 |
1 |
0 |
Steptronic |
1 |
1 |
0 |
0 |
Relevant faults in the oil pressure sensors
The following faults are treated in the test module:
No liability can be accepted for printing or other errors. Subject to changes of a technical nature