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Checking engine speed sender G28 > < Checking wiring

A3 Mk1

Checking sender:
Checking sender:
–  Switch off ignition.
   
–  Unplug 4-pin connector -1- from air mass meter -2-.
  N24-0701
–  Connect multimeter between contacts 2 and 4 to measure resistance.
  N24-0747
Range A shows resistance values for temperature range 0...50 °C and range B the values for temperature range 50...100 °C.
Sample readings:
t  30 °C corresponds to a resistance from 1500...2000 Ω
t  80 °C corresponds to a resistance from 275...375 Ω
If specifications are attained:
–  Remove the intake hose between air mass meter and throttle valve control unit.
–  Read measured value block, display group 004.
–  Check display in display zone 4.
  N24-0157
–  Spray the air intake temperature sender -G42--arrow- with cooling spray.
t  Specification: The temperature value should drop
If specification is not attained:
–  Replace the air mass meter -G70- with intake air temperature sender -G42-.
  N24-0711

Checking engine speed sender G28 > < Checking wiring