Yanmar 6SY Series, Operation Manual

Page: 31 / 128

PRODUCT OVERVIEW
6SY Operation Manual
23
ENGINE MANAGEMENT
SYSTEM (EMS S6)
This engine has an Electronic
Management System (EMS) with unit
injectors (PDE) which provide each
cylinder with the right amount of fuel at the
right time in all operating situations.
The EMS system consists of a control unit
(S6) and sensors for speed, charge air
temperature and pressure, coolant
temperature, oil pressure, and throttle
actuation. These sensors constantly send
signals to the control unit. With this input
data and the programmed control
software, the correct fuel amount and
correct injection time are calculated for
each unit injector (PDE) under the specific
operating conditions.
The EMS system sensors are also used to
send signals to the digital display in the
instrument panel.
The control unit constantly checks the
sensors to make sure they are operational.
The control unit contains monitoring
functions to protect the engine in the event
of a fault which would otherwise damage it.
In the event of a fault, an alarm for low oil
pressure or high coolant temperature for
example, the S6 control unit sends a
message to the digital display.
Only authorized personnel are allowed to
carry out diagnostic procedures and
program changes.
The positions of the sensors which send
signals to the control unit are shown
(Figure 3) .
Positions of Sensors for EMS with S6
(4)
( 3 )
(2)
(1)
Figure 3
1. Oil Pressure Sensor
2. Charge Air Temperature and
Pressure Sensor
3. Coolant Temperature Sensor
4. Engine Speed Sensors (2 used)