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Checking signals from and to automatic gearbox > < Checking accelerator pedal position sender G79

A4 Mk1

Checking variable intake manifold flap changeover valveN239
Checking variable intake manifold flap changeover valve -N239-
–  Start engine.
   
–  Watch linkage rod for intake manifold flap while a second mechanic switches off the engine.
–  When the engine is switched off, the intake manifold flap should close and remain closed for 1 or 2 seconds.
Measure resistance if intake manifold flap does not close as described.
Electrical check of intake manifold flap changeover valve -N239-
–  Unplug connector from intake manifold flap changeover valve -N239- ⇒ Fitting locations overview → Chapter.
–  Connect hand-held multimeter to measure resistance on intake manifold changeover valve -N239-.
t  Specification: 30...40 Ω
If specification is not obtained:
–  Renew variable intake manifold flap changeover valve -N239-.
If specification is obtained, check voltage supply.
Checking voltage supply to intake manifold flap changeover valve -N239-
  A23-0102
–  Connect hand-held multimeter (voltage measurement range) between earth and contact 2 on the connector.
–  Switch on ignition.
t  Specification: approx. battery voltage
If specification is not obtained:
–  Check voltage supply using current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations.
If the specification is obtained, check wiring to diesel direct injection system control unit -J248-.
Checking wiring connection
–  Connect test adapter -V.A.G 1598/30- or -V.A.G 1598/31- to wiring harness for engine control unit. Do not connect engine control unit → Chapter.
  V96-0749
Check the following wiring connections for open circuits and shorts to positive or earth:
  V96-0749
2-pin connector, contact-V.A.G 1598/30-, socket-V.A.G 1598/31-, socket
12/2081

Resistance in wiring: max. 1.5 Ω
–  Rectify open circuit or short circuit in wiring as necessary → Current flow diagrams, Electrical fault finding and Fitting locations.
   

Checking signals from and to automatic gearbox > < Checking accelerator pedal position sender G79