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Ignition system, glow plug system > < Injection system: Repairing

Leon Mk1

Checking voltage supply and wiring to control unit
Checking voltage supply and wiring to control unit
–  Remove air filter → Fig..
   
–  Remove connector -1- from throttle valve control unit -2-.
–  Connect the multimeter to measure voltage to contacts 4+7 of the connector.
–  Switch ignition on.
   Specification: 4.5 V min
–  Switch ignition off.
–  Connect multimeter to measure voltage at connector contacts 3+7.
–  Switch ignition on.
   Specification: 9 V min
–  Switch ignition off.
  N24-0304
–  Connect test box -V.A.G 1598/18- to control unit wiring harness.
  N24-0334
–  Check wiring for open circuit between test box and connector using current flow diagram.
  N24-0170
ContactTest box -V.A.G 1598/18-, socket
12
226
310
414
541
717
816
Wire resistance: 1,5 Ω max.

–  Additionally, check wires for short to one another.
   Specification: ∞ Ω
If no wiring fault is detected:
–  Check engine control unit voltage supply → Chapter.
   

Ignition system, glow plug system > < Injection system: Repairing