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Leon Mk2

Checking engine speed sender
Checking engine speed sender
The engine speed sender -G28- is a speed and reference mark sender. The engine will not start if there is no speed signal. If the speed signal fails when the engine is running, it will cause the engine to stall immediately.
Special tools and workshop equipment required
t  Test box -V.A.G 1598/22-
t  Hand multimeter -V.A.G 1526- or multimeter -V.A.G 1715-
t  Adapter set -V.A.G 1594-
t  Current flow diagram
Test conditions
l  The battery voltage must be at least 11.5 V.
Test sequence
–  Remove air cleaner → Fig..
   
–  Detach black 3-pin connector to engine speed sender -arrow- (on thermostat housing).
  N24-0915
–  Connect multimeter to measure voltage using aux. cables from -V.A.G 1594- to contacts 1 (positive) and 3 (earth) on engine speed sender connector.
–  Switch on ignition. Specification: min. 4.5 V
–  Switch off ignition.
If no voltage is present:
–  Remove wiper arms and cowl panel: → Electrical system; Rep. Gr.92
  N28-0131
–  Connect test box -V.A.G 1598/22- to control unit wiring harness.
  N24-0709
–  Check wires between test box and 3-pin connector (connector to control unit) for open circuit using current flow diagram. Contact 1+socket 62 Contact 2+socket 53 Contact 3+socket 67 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

Checking injectors > < Checking coolant temperature sender