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Checking injection timing control range > < Checking metering adjuster N146

Golf Mk4

Checking needle lift senderG80
Checking needle lift sender -G80-
The needle lift sender signal is required to determine the commencement of injection. If it fails, the commencement of injection switches to open-loop control (depending on engine speed and load). During normal operation, the commencement of injection is controlled by a closed-loop function (depending on engine speed, load and temperature).
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 procedure
–  Switch off ignition.
–  Disconnect connector for needle lift sender -G80- → Chapter.
   
–  Measure resistance between connector contacts.
Specification: 80…120 Ω
If the specification is not achieved:
–  Renew No. 3 cylinder injector with needle lift sender -G80-.
If the specification is attained:
  V96-1216
–  Connect adapter cable, 121-pin -V.A.G 1598/31- to control unit wiring harness.
  N24-0943
–  Check wiring between adapter cable, 121-pin -V.A.G 1598/31- and connector for open circuit referring to current flow diagram.
Contact 1+socket 109 Contact 2+socket 101 Line 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 fault in lines is detected:
–  Renew diesel direct injection system control unit -J248- → Chapter.
  V96-0749

Checking injection timing control range > < Checking metering adjuster N146