Thermo Pro 90 6 Operating tests
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Rubbing and friction noises must be listened for. In addition,
start-up must be audible up to the specified speed. In the
event of the fan rubbing the fault message would be "Slug-
gish fan start".
6.4.5 Testing DP42 metering pump
During an electrical test with a digital multimeter, the DP42
is to have the following values:
Resistance at 25 °C: 4,95 to 5,45 ohms
Test current: < 1 mA
Diesel feed rate at metering pump frequency of 9 Hz and
feed time of 180 s: 49.5 to 54.7 ml
6.4.6 Testing overheating protection
NOTE
The overheating protection (ÜHS) may only be removed if it
is replaced with a new one. The operating test must be car-
ried out while installed.
Check continuity of overheating protection at room temper-
ature; the electrical resistance must be approximately
0 ohms in this case.
6.4.7 Testing circulation pump
The operation of the circulation pump (UP) must be tested
with the component test function in the Webasto Thermo
Test PC Diagnosis. In addition, operation can also be felt by
touching the circulation pump with the hand. When doing
so, a constant vibration of the circulation pump must be felt.
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