Gearbox management system
Gear selector solenoid valves
Valve 1 in gear train half 1 N433,
valve 2 in gear train half 1 N434,
valve 1 in gear train half 2 N437,
valve 2 in gear train half 2 N438
The gear selector solenoid valves are located in the
mechatronic unit's hydraulic module.
● N433 gears 1 and 3, gear train half 1
● N434 gears 5 and 7, gear train half 1
● N437 gears 4 and 2, gear train half 2
They are used by the gearbox control unit to control
the oil volume to the gear selectors and therefore for
changing gears.
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● N438 gears 6 and R, gear train half 2
Valve 2 in gear train half 1
N434
Valve 2 in gear train half 2
N438
S390_078
Valve 1 in gear train half 1
N433
Valve 1 in gear train half 2
N437
Effects of signal failure
If one of the solenoid valves fails, the corresponding gear train half is shut off.
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