Electrical and electronic systems
43
Introduction of New Generation of 4-Cylinder Inline Engines, OM 651
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Glow system
Instant Start System
The electronically controlled Instant Start System
consists of a glow output stage and four ceramic glow
plugs. The Instant Start System allows the engine to
be started immediately without preglowing at high
coolant temperatures. In order to improve the cold
start and warm-up characteristics of the engine, after-
glowing is performed in steps via the controllable glow
temperature. The CDI control
unit regulates the
voltage at the glow plugs via the glow output stage
depending on time and temperature.
This has the following advantages:
• Short preglow time
•Stable idling
• Low exhaust gas emissions
• Good response behavior
• Controllable glow temperature
A distinction is drawn between the following glowing
types:
•Preglowing
•Start-ready glowing
•Afterglowing
• Diagnostic glowing
• DPF glow function
• Emergency glowing
a Risk of engine damage
Safety information for handling ceramic glow
plugs:
• Only use glow plugs from unopened original
packaging.
• If a glow plug is dropped on the floor, it must
not be used.
• Important: Engine damage can occur because
glow plugs are very sensitive to shock! Hairline
cracks may develop in the ceramic element. As
a consequence, parts may become detached
and drop into the combustion chamber while
the engine is running. Always handle glow
plugs with the utmost care!
• The glow plugs must be removed before
removing the cylinder head, and must not be
reinstalled until the cylinder head has been
installed.
i Note
If a fault occurs in the preglow system, glow plugs
or lines, this is indicated by the preglow indicator
lamp and the fault is also stored in the CDI control
unit.
Ceramic glow plug
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