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Injectors checking > < Coolant temperature sender checking

Leon Mk2

Engine speed sender: checking
Engine speed sender: checking
The engine speed sender -G28- is a speed and reference mark sender. If the speed signal fails when the engine is running, it can cause the engine to stall.
Special tools and workshop equipment required
t  Test box -V.A.G 1598/31-
t  Hand multimeter -V.A.G 1526 A- or multimeter -V.A.G 1715-
t  Adapter set -V.A.G 1594 C-
t  Current flow diagram
Test conditions
l  Battery voltage at least 11.5 V
Test sequence
   
–  Detach black 3-pin connector to engine speed sender -arrow- (on thermostat housing).
  E24-0163
–  To measure voltage, connect multimeter using aux. cables from -V.A.G 1594 C- at contacts 1 (positive) and 3 (earth) of engine speed sender connector.
–  Switch on ignition
   Specification: min. 4.5 V
–  Switch off ignition.
If no voltage is present:
  N28-0131
–  Connect test box -V.A.G 1598/31- to control unit wiring harness. The engine control unit remains disconnected.
  N24-0943
–  Check wiring between test box and 3-pin connector for open circuit using current flow diagram.
   Contact 1+socket 87
   Contact 2+socket 82
   Contact 3+socket 108
   Wire resistance: max. 1.5 Ω
–  Additionally check wires for short to one another.
   Specification: ∞ Ω
If no wiring fault is detected and voltage was present between contacts 1+3:
–  Replace engine speed sender -G28- → Item.
If no wiring fault is detected and no voltage was present between contacts 1+3:
–  Replace engine control unit → Chapter.
  A24-0096

Injectors checking > < Coolant temperature sender checking