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Functional description of auxiliary heater > < Test step "5”

A4 Cabriolet Mk2

Test step “6”
Test step “6”
Flame monitor -G64-
   
Vehicle diagnostic, testing and information system -VAS 5051A-, measurement mode: Multimeter, resistance measurement (0...100 kΩ)
Test stepConnection to connector “C” → ChapterChecking of
l  Test conditions
–  Additional operations
SpecificationMeasures to be taken if reading does not match specification
6.1Contact “3” and contact “10”Flame monitor -G64- and corresponding connections to auxiliary heater control unit -J364- 
–  ∞ Ω (infinity ohms)
–  Use current flow diagram to locate and eliminate short to earth.
–  Check and if necessary replace flame monitor -G64- → Chapter
6.2Contact “4” and contact “10”Flame monitor -G64- and corresponding connections to auxiliary heater control unit -J364- 
–  ∞ Ω (infinity ohms)
–  Use current flow diagram to locate and eliminate short to earth.
–  Check and if necessary replace flame monitor -G64- → Chapter

   
Vehicle diagnostic, testing and information system -VAS 5051A-, measurement mode: Diode test U/R/D
Test stepConnection to connector “C” → ChapterChecking of
l  Test conditions
–  Additional operations
SpecificationMeasures to be taken if reading does not match specification
6.3Contact “4” and contact “3”Flame monitor -G64- and corresponding connections to auxiliary heater control unit -J364-
l  Auxiliary heater assembled or flame monitor obscured
–  “Switch open” symbol appears
–  Use current flow diagram to check and repair connection to flame monitor -G64-
6.4Contact 4
and
contact 3		Flame monitor -G64- and corresponding connections to auxiliary heater control unit -J364-
–  Remove flame monitor → Chapter
l  Flame monitor removed and photosensor illuminated (e.g. using a torch)
–  “Switch closed” symbol appears
–  Use current flow diagram to check and repair connection to flame monitor -G64-
–  Check and if necessary replace flame monitor -G64- → Chapter

  Note
t  If a fault is detected at the flame monitor -G64- (e.g. “Switch closed”, corresponding to “Flame detected”, on activation), the auxiliary heater does not start up. The auxiliary heater cannot be re-started until the fault is no longer present.
t  The flame monitor -G64- is a phototransistor. The flame monitor -G64- switches as soon as it is exposed to the brightness of a flame. The switching status of the flame monitor -G64- is displayed in the measured value block (display group “004” → Chapter).
t  If, for example, the portable multimeter -V.A.G 1526/ A- is used to check the flame monitor, connect “+ connection” of the measuring instrument to contact “4” and “- connection” to contact “3” of the connector-C-. If the measuring instrument has been properly connected, the voltage display in the “Diode test” function with the flame monitor -G64- obscured will be greater than 1.3 V and less than 0.7 V with the flame monitor -G64- illuminated.
t  If the flame monitor -G64- has been replaced and in doing so the two contacts of the flame monitor -G64- interchanged, the auxiliary heater control unit -J364- cannot recognise the signal from the flame monitor -G64- (the illuminated phototransistor only allows the current to flow in one direction).
t  The accumulation of combustion residue (soot) on the lens of the flame monitor -G64- impairs light exposure and thus operation of the flame monitor -G64- → Chapter.
t  The flame monitor -G64- is installed in the auxiliary heater housing → Chapter.
   

Functional description of auxiliary heater > < Test step "5”