Function Tests; General; Repair Shop Level Testing; Testing Individual Components - Webasto Dual Top Evo 6 Workshop Manual

Dual Top Evo 6 / 7 / 8
5

Function tests

5.1

General

This section describes the tests conducted on the heater
when it is installed and not installed to verify that it is in
working order.
CAUTION:
The heater must not be operated in enclosed areas
such as garages and workshops without an
emissions extraction system.
5.2

Repair Shop Level Testing

5.2.1 Testing individual components

IMPORTANT:
For function tests always disconnect the
connection between the control unit and the
component to be tested.
5.2.1.1 Resistance measurement of eletrical heating
elements
During the test the electrical heating elements (each Dual Top
Evo 7/8 has 2 electrical heating elements) are to have the
following values:
Dual Top Evo 7, resistance at 20 °C:
Dual Top Evo 8, resistance at 20 °C:
Test current:

5.2.1.2 Glowplug resistance test

NOTE:
The resistance test must be carried out with an
ohmmeter suitable for small resistance values or
Webasto Thermo Test PC Diagnosis.
A resistance test with a simple digital multimeter is
too inaccurate to find the precise values. A new
glow plug can be measured to act as a reference.
The glow plug should have the following values in the test:
Glow plug:
Resistance at 25 °C:
Test current:
88 
53 
< 5 mA
12 V (red)
0.190 to 0.250 V
< 5 mA

5.2.1.3 Air temperature sensor resistance test

If you conduct this test with a digital multimeter, the air
temperature sensor (see Fig. 503) must have the values
shown in the following diagram:
Temperature in °C
Fig. 501 Characteristic resistance values of a PT 2000
overheating sensor within a temperature
range of 10 °C to 30 °C.

5.2.1.4 Water temperature sensor resistance test

A: Resistance in k
B: Temperature of water temperature sensor -G18- (see
Fig. 503) in °C
C: Resistance as a function of temperature
Fig. 502 Characteristic resistance values of water
temperature sensor
5 Function tests
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