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Engine control unit: replace, code and adapt > < Final control diagnosis: carrying out

Leon Mk1

Voltage supply for diesel direct injection system: checking
   
Voltage supply for diesel direct injection system: checking
Special tools and workshop equipment required
t  Hand multimete -V.A.G 1526A- or multimeter -V.A.G 1715-
t  Auxiliary measuring set -V.A.G 1594A- or -V.A.G 1594C-
t  Test box -V.A.G 1598/18A-
t  Current flow diagram

Checking conditions
l  Battery voltage, OK
Test sequence
–  Switch ignition off.
   
–  Connect test box -V.A.G 1598/18- to control unit wiring harness.
–  Bridge test box sockets 42 + 46 using auxiliary cables from -V.A.G 1594A- or -V.A.G 1594C-.
–  Measure the voltage between the following sockets: 45 + 1, 68 + 1 and 23 + 1. Specification: approx. battery voltage
If the specification is not obtained:
–  Check the voltage supply relay terminal 30 -J317-.
–  Check cables for brake, open circuit and transfer resistances at contact points, using current flow diagram.
If no wiring or relay fault is detected:
–  Replace diesel direct injection control unit -J248- → Chapter.
  V29-0062

Engine control unit: replace, code and adapt > < Final control diagnosis: carrying out