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7 | Function checks
7.6
Check the blower fan wheel
Blower fan mechanic-
yes
ally damaged?
Deformation?
Locking lug broken?
no
Component is OK.
NOTE
Electrical wiring must not lie against the blower fan
wheel.
7.7
Checking baffle plate
Clean and
yes
visually check baffle
plate:
is it mechanically dam-
aged?
Deformation?
Broken?
no
Component is OK.
7.8
Checking drive motor
Check connector. Dam-
yes
aged?
no
Visually check cable of
yes
the drive motor. Dam-
aged?
no
Visually check drive mo-
yes
tor. Drive motor dam-
aged?
no
Component is OK.
26 / 49
Replace
compon-
ent.
Replace
compon-
ent.
Replace
compon-
ent.
Replace
compon-
ent.
Replace
compon-
ent.
7.9
Fuel pump and check solenoid
valve
A
B
Fig. 20 Fuel pump
A
Pin 1
NOTE
The pump pressure is non-adjustable ex-factory. Adjust-
ing the pump pressure is not permitted.
NOTE
The fuel pump and the fuel lines must be replaced after
5 years.
7.9.1
Connect to Webasto Thermo Test PC
Diagnostics
Test the fuel pump for abnormalities and activate the fuel sup-
ply.
A
B
Fig. 21 Connect WTT PC diagnosis
A USB interface 1
Testing with Webasto Thermo Test Diagnostics:
1.
Connect WTT
2.
Start WTT
3.
Start burner motor component test
4.
Set speed of 5550 rpm
5.
Heater evaluation:
– Fan is running
– Audible start-up noises (The fan starts up until the set
speed is reached.)
– No disturbing scraping noises must be audible, e.g.,
squeaking.
9039412C Workshop manual TTP 120 _ 150
B
Pin 2
B Diagnostic adapter 2
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