Diagnostic function
The diagnostic function monitors and checks that the engine, drive-unit and EVC system function normally.
the diagnostic function has the following tasks:
l
Discover and localize malfunctions
l
Notify that malfunctions have been discovered
l
Give advice in fault finding
l
Protect the engine and ensure continued operation when serious malfunctions are discovered.
the diagnostic function affects the engine in the
following ways when:
1. The diagnostic function has discovered a minor
malfunction which does not damage the engine
or drive-unit.
reaction
: The engine is not affected.
2. The diagnostic function has discovered a serious
malfunction which will not immediately damage
the engine (e.g. high coolant temperature) or
drive-unit.
reaction
: Engine power is reduced till the rele-
vant value is normalized.
3. The diagnostic function has discovered a serious
malfunction which will cause serious damage on
the engine or the drive-unit.
reaction
: Engine power is reduced.
4. The diagnostic function has discovered a serious
malfunction which makes it impossible to control
the engine or the drive-unit.
reaction
: The drive-unit is disengaged and
engine power is reduced.
It is possible to do an emergency shift: Please
refer to the “Emergency shifting” section.
5. The diagnostic function has discovered a serious
malfunction on the drive-unit or in the engine fuel
injection system.
reaction
: Engine is stopped
It is possible to do an emergency shift: Please
refer to the ”Emergency shifting” section. In se-
rious emergency it is also possible to start the
engine with gear engaged after acknowledging
the alarm.
87
In case of emergency
Summary of Contents for D9 MH
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