Group 30: Electrical system
Malfunctions
37
Start / preheat warning
Fault indication
Tachometer:
The tachometer LCD screen will show a flashing
warning icon and the alarm buzzer sound.
Alarm display:
The warning indication flashes in the alarm d
audible warning.
Symptom
The engine will not start/crank when pressing the
start button.
Cable description
Inside the MDI there are two not replaceable relays.
One relay is used to activate the preheat function.
The other relay is used to activate the starter solenoid
at the starter motor.
The preheat function will be activated when the start/
preheat button is pushed if the coolant temperature is
below 50°C. The MDI preheat output will change its
potential from 0 volt to nearly battery voltage across
the glowing plugs when the preheat function is acti-
vated.
When the start/preheat button is activated the MDI
start relay output will change its potential from 0 volt
to battery voltage to activate the starter solenoid at
the starter motor .
https://www.boat-manuals.com/
