6.3
Components Testing
CAUTION
During electrical testing always ensure that the control
unit and the component under test are electrically discon-
nected from each other.
6.3.1 Glow Plug Resistance Test
During electrical testing of the glow plug using a digital
multimeter, the following readings should be obtained:
Glow plug
12 Volt (red)
24 Volt (green)
Resistance at 25 °C: 0.324 ... 0.360
Ω
1.3 ... 1.44
Ω
Test current:
< 5 mA
< 5 mA
6.3.2 Flame Sensor Resistance Test
During electrical testing of the flame sensor using a digi-
tal multimeter, the following readings should be obtained:
Cold test:
Resistance at 25 °C:
2.6 ... 3.4
Ω
Test current:
< 5 mA
Hot test:
Resistance at 800 - 1000 °C:
12 ... 15
Ω
(ceramic rod red hot over a length of approx. 20 mm)
Test current:
< 5 mA
602
6 Functional Tests
Air Top 2000