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Checking fuel temperature sender G81 > < Checking intake air temperature sender G42

Polo Mk3

Checking voltage supply for diesel direct injection system
Checking voltage supply for diesel direct injection system
Special tools and workshop equipment required
t  Adapter cable (68-pin) -V.A.G 1598/18A- or adapter -V.A.G 1598/22-
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 prerequisites:
l  Battery voltage OK.
Test procedure
–  Switch off ignition.
Engine code AGD (with 68-pin control unit)
   
–  Connect adapter cable, 68-pin -V.A.G 1598/18A- to control unit wiring harness.
–  Bridge sockets 42+46 using auxiliary cables from auxiliary measuring set -V.A.G 1594C-.
–  Measure voltage between following sockets: 45+1, 68+1, 23+1 and 23+24.
Specification: approx. battery voltage
Engine codes AGD (with 80-pin control unit), AHG, AKU
  V29-0062
–  Connect adapter -V.A.G 1598/22- to control unit wiring harness.
–  Bridge sockets 33+1 using auxiliary cables from auxiliary measuring set -V.A.G 1594C-.
–  Measure voltage between following sockets: 2+1, 28+1, 27+2 and 28+27.
Specification: approx. battery voltage
Continuation for all engine codes
If the specification is not achieved:
–  Check terminal 30 voltage supply relay -J317-.
–  Check cable connections for open circuit, short circuit and transfer resistance at contacts according to current flow diagram.
If no fault is found in wiring and relay:
–  Renew diesel direct injection system control unit -J248- → Chapter.
  N23-0197

Checking fuel temperature sender G81 > < Checking intake air temperature sender G42