Volvo Penta D1-13 Workshop Manual page 34

30-2 Fault Tracing
32
Start/preheat warning
Tachometer
The tachometer LCD screen will show a flashing warn-
ing icon and the alarm buzzer sound.
Alarm display
The warning indication flashes in the alarm display +
audible warning.
Symptom
The engine will not start/crank when pressing the start
button.
Circuit 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.
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