37
Diagnostic function
The diagnostic function monitors and checks that
the EDC 4 system functions normally.
Diagnostic function
The diagnostic function has the following tasks:
•
Discover and localize malfunctions.
•
Notify that malfunctions have been discovered.
•
Give advice in fault finding.
•
Protect the engine and ensure continued opera-
tion when serious malfunctions are discovered.
Malfunction message
If the diagnostic function discovers a malfunction in
the EDC 4 system, this is notified via the CAN bus
or the diagnostic lamp lights up or starts to flash. At
the same time, the fault is stored in the control unit
memory. As soon as the fault has been attended to
and the ignition is turned off and on, the fault code
lamp goes out. Both rectified (passive) and un-recti-
fied (active) faults are stored in the control unit and
can be read by an authorized workshop.
Fault tracing guide
If the diagnostic button is depressed (for 1-3 sec-
onds) and then released, a fault code is flashed out
from the diagnostic lamp. The fault code is found
in the fault code list, with information about the
reason, reaction and measures to be taken. Please
refer to the “Fault codes” chapter.
Effect on engine
The diagnostic function affects the engine in the fol-
lowing ways:
1. The diagnostic function has discovered a minor
malfunction which does not damage the engine.
Reaction:
The engine is not affected. The diag-
nostic lamp lights up.
2. The diagnostic function has discovered a serious
malfunction which makes it impossible to control
the engine.
Reaction:
The diagnostic lamp starts to flash.
Engine is shut off.
Operation
During starting
When the ignition is turned on, the diagnostic lamp
lights up for two seconds, together with the warning
lamps for oil pressure and coolant. This is to check
the lamp function.
If the diagnostic lamp flashes after the two seconds,
this indicates a serious fault and the engine can not
be started. One or more fault codes can then be
flashed out.
If the diagnostic lamp is lit, there are one or more
less serious faults. One or more fault codes can then
be flashed out.
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