9
The glow plug ensures ignition of the
air-fuel mixture as the pre-heater starts.
To check the operation of the plug and
replace the plug:
• Disconnect the control unit
connectors from the harness
• Remove the screws fastening the
control unit to the pre-heater
housing, remove the control unit
from the pre-heater, thus providing
the required access
• Disconnect the plug outputs from
the control unit
• Unscrew the plug
• Check plug operation by connect-
ing its terminals to a 12 V battery:
the plug must glow bright red
(temperature approx. 1000°С)
from its tip to about its middle part.
After 30 seconds, measure current
consumption. Current consumption
must be within 3 to 5.2 А. Continue
the test for no more than 90 s. Wait
no less than 180 s before repeating
the test
• If the plug is fault-free, check its
operation from the control unit.
To do that, clean and tighten plug
terminals and then, without screw-
ing the plug into the combustion
chamber, connect its terminals to
the terminals of the control unit.
Connect the control unit termi-
nals to the harness and turn the
pre-heater on. The plug must
gradually heat up to the same tem-
perature as when connected to the
battery. If it is not the case, replace
the control unit.
If the heating element works fault-
lessly after the replacement of the
control unit, the one removed must
be deemed faulty and should
be replaced.
If the plug does not meet at least one
of the above requirements, replace it.
Replace the plug in the reverse order.
Prior to mounting the plug, install the
washer and the bushing (g. 2) on it
and only then screw the plug into the
combustion chamber nozzle.
Note: For a gasoline-operated pre-
heater, install the screen onto the plug
as well (Fig. 2а).
Caution: Do not use voltage above
12 V to check the plug!
5.1 Purpose, Check, and Replacement of the Glow Plug
Glow
Washer
Sleeve
Fig. 2. Plug with an installation kit
(for a diesel pre-heater)
Fig. 2a. Plug with an installation kit
(for a gasoline pre-heater)
Screen
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