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Checking fuel temperature sender > < Checking intake air temperature sender

Leon Mk2

Test sequence
Test sequence
–  Connect fault reader -V.A.G 1551- (-V.A.G 1552-) and select engine electronics control unit with the “Address word” 01. When doing this the engine must be running at idling speed. (Connecting fault reader and selecting engine electronics control unit → Vehicle diagnosis, testing and information system VAS 5051.)
   
Indicated on display:
–  Press keys 0 and 8 for the function “Read measured value block” and confirm entry with Q key.
  
Rapid data transfer                 HELP
Select function XX
Indicated on display:
–  Press keys 0, 0 and 7 for “Display group number 7” and confirm entry with Q key.
  
Read measured value block           HELP
Input display group number XXX
Indicated on display:
–  If no realistic display appears in display zone 3 or a substitute temperature of 136.8 °C is displayed, check intake manifold temperature sender and the wiring to the sender as follows:
–  Press the → key.
–  Press keys 0 and 6 for the function “End output” and confirm entry with the Q key.
–  Switch off ignition.
  
Read measured value block 7            →
15.4 °C            15.9 °C       16.7 °C
–  Pull 2-pin connector off intake air temperature sender -G42--arrow-.
  E23-0016
–  Measure resistance between sender contacts 1+2.
  E23-0015
Specification see diagram
Scale A shows resistance values for temperature range 0...50 °C and scale B the values for temperature range 50...100 °C.
Examples:
t  30 °C corresponds to a resistance from 1500...2000 Ω
t  80 °C corresponds to a resistance from 275...375 Ω
If the specification is not attained:
–  Renew intake air temperature sender -G42-.
If specification attained:
–  Remove wiper arms and cowl panel: → Electrical system; Rep. Gr.92
  N24-0157
–  Connect test box -V.A.G 1598/22- to control unit wiring harness.
  N24-0709
–  Check wiring for open circuit between test box and 2-pin connector according to current flow diagram. Contact 1+ socket 13 Contact 2+ socket 25 Wire resistance: max. 1.5 Ω
–  Additionally check wires for short to one another, to vehicle earth and to battery positive. Specification: ∞Ω
If no wiring fault is detected:
–  Renew engine control unit → Chapter.
  N24-0231

Checking fuel temperature sender > < Checking intake air temperature sender