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Volkswagen Workshop Service and Repair Manuals

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Checking additional signals > < Checking wiring to control unit

Polo Mk3

Checking camshaft position Hall senderG40
Checking camshaft position Hall sender -G40-
Special tools and workshop equipment required
t  Adapter cable, 121-pin -V.A.G 1598/31-
t  Hand multimeter -V.A.G 1526C- or multimeter -V.A.G 1715-
t  Auxiliary measuring set -V.A.G 1594C-
t  Current flow diagram
Test prerequisite
l  Fuses 23 and 27 OK. 
Test procedure
–  Pull 3-pin connector off Hall sender -G40- → Chapter.
   
–  Connect hand multimeter -V.A.G 1526C- using aux. cables from auxiliary measuring set -V.A.G 1594C- to measure voltage at contacts 1 (positive) and 3 (earth) of Hall sender -G40-.
–  Switch on ignition. Specification: Battery voltage
–  Switch off ignition.
If no voltage is present:
  A24-0096
–  Connect adapter cable, 121-pin -V.A.G 1598/31- to control unit wiring harness.
–  Check wiring between adapter cable, 121-pin -V.A.G 1598/31- and 3-pin connector for open circuit referring to current flow diagram.
Contact 1 + socket 1/2
Contact 2 + socket 109
Contact 3 + socket 101
  N23-0377
Wire resistance: max. 1.5 Ω.
–  Also check wiring for short to one another, short to vehicle earth and short to battery positive.
Specification: ∞ Ω.
If no wiring fault is detected and voltage was present between contacts 1 + 3:
–  Renew Hall sender -G40- → Chapter.
If no wiring fault is detected and no voltage was present between contacts 1 + 3:
–  Renew diesel direct injection system control unit -J248- → Chapter.
  A24-0096

Checking additional signals > < Checking wiring to control unit