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With the Bosch EDC16 high-pressure diesel system
use malfunction warning symbols and text warning
messages, depending on the level of severity of the
malfunctions detected, to inform the customer and
determine the correct malfunction finding procedure.
The ECM controls activation of the warning lights and
the display of messages on the instrument panel. The
default warning lights and error messages are visible:
- during the preheating phase,
- if there is an injection malfunction,
- if the engine is overheating.
The warning signals are sent to the instrument panel
via the CAN communication line.
WARNING LIGHT ACTIVATION PRINCIPLE
During the starting phase (press on the « Start »
button, the glow indicator comes on during the
preheating phase, then goes out (Section Preheating,
Pre/postheating control, refer to F9Q-39).
In the event of an injection malfunction (severity 1), the
« Check injection » message is displayed and then the
« Check engine » warning light comes on. It indicates a
reduced level of operation and a limited safety level.
These malfunctions are associated with:
- an internal ECM malfunction,
- an immobiliser system malfunction,
- a speed synchronisation malfunction,
- an accelerator pedal position sensor,
- a mass air flow sensor,
- a crankshaft position sensor (see anti-lock braking
system),
- an EGR control solenoid valve malfunction,
- a malfunction in the turbocharger pressure regulation
solenoid valve,
- a malfunction in the main relay of the protection and
switching unit,
- an injector malfunction,
- an injector flow correction value (IMA),
- a sensor power feed malfunction.
If there is a serious injection malfunction (severity 2),
the red engine symbol and the word « Stop » appears
(display with matrix only), with the « Injection
malfunction » message followed by the « Stop »
warning light and buzzer.
The malfunctions are associated with:
- an internal ECM malfunction,
- an injector malfunction,
- a rail pressure sensor malfunction,
- a rail pressure regulator malfunction.
If the engine overheats, the engine temperature malfunction
symbol appears with the « Engine
overheating » message (engine temperature with
matrix only) followed by the « Stop » warning light and
buzzer. In this case the vehicle must be stopped
immediately.
« On Board Diagnostic » excess pollution orange
warning light.
The orange warning light in the form of an engine
symbol comes on for about 5 seconds when the
ignition is switched on, then goes out. It is never visible
when the engine is running (not operational).
