Citizservicemanual139
F U N C T I O N T E S T S
9.7 NTCtem per atu res ens or fu nc ti on alit y TheresistanceoftheNTCte mperaturesensormustbewit hinadefinedrange,other
wisethetemperatureregulati onwillnotworkproperlyandthecof feemachinewillstay/
gointofailuremode.
AneasywaytocheckthefunctionalityoftheNTCtemperaturesensoristomeasurethe
ohmicresistanceatambient temperature.Withthismeasur ement,mostdefectNTC
temperaturesensorscanbe detected.
Avoidcontamination
ofsensorcontactsur
faceduringhandling.
1) UnplugNTCtemperaturesensorfrom
electroniccontrolboard.
2) RemoveNTCtemperature sensor
fromthermoblock(refertopa ge104
andfollowing).
3) Measuretemperatureofsen sorbody
(donottoucheithertemperat ureor
NTCsensorbyhand).
4) MeasureresistanceofNTC tempera
turesensorbyconnectinga multime
terattheplug.
5) Comparemeasuringvalues withfol
lowingdiagramortable.