Throttle lever control system
71
Solenoid valve plug (Item no. 51.25432−0070)
The components À integrated into connector Á
serve to protect the control electronics of the
terminal box and to signal the gear status (LED) of
the gearbox. A considerable advantage in this
case is the protection against polarity reversal of
the tens diode and the LED. This feature is also
ensured even when the connections are
accidentally swapped.
Function principle:
Zener diode Ä (bi−directional) reverse−polarity
protected:
The Zener diode helps suppress the voltage peaks
− exceeding 33 V − that arise when switching off
the solenoid valve.
LED Å (bi−directional) reverse−polarity protected:
Activation of the solenoid valves is indicated by
LED illumination and can be easily recognised
through the transparent plug housing.
Checking the plug function
D Disconnect the plug from the solenoid valve
D Open the plug housing
Resistance measurement in plug
D Using a multimeter, measure between Pin Â
and Pin Ã
The resistance value measured must be infinite
Diode test function
D Set multimeter to “Diode test"
D Positive at Pin à and negative at Pin Â
D Measure negative at Pin  and positive at
Pin Ã
In each case, the voltage value
must be approx. 2 V
1 2
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