SHOP MANUAL
Ch 6 page 56
ELECTRICAL SYSTEM
Control unit S6 / S8 Tier2 and Tier4
Power supply: Nominal 24 V DC .
The Control unit is transient
and reverse voltage
protected by a series diode.
Function
The engine control unit collects information that it later converts to signals for controlling
the fuel system, alternator, starter motor, radiator fan and air conditioning.
The vehicle electrical system has a system voltage of +24 V and is grounded via the chassis.
The engine control unit converts the system voltage to a lower voltage of +5V for supplying the sensors, etc.
These sensors are grounded through the control unit.
Sensor group
The coolant temperature sensor T33 and the charge air sensor T47 form one sensor group.
This means that the voltage supply from the control unit is common to both sensors.
If, for example, one sensor is short-circuited it may also affect the other.
Renewal:
Turn off the ignition and wait until the warning lamp has extinguished before disconnecting the
control unit. Otherwise the control unit may be damaged!
Engine EMS S6 / S8
Figure 39
Figure 40
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