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Exhaust system > < Checking components and functions

Leon Mk1

Test sequence
Test sequence
–  Connect fault reader -V.A.G 1551- (-V.A.G 1552-) and select engine electronics control unit with the “Address word” 01. When doing this the engine must be running at idling speed. (Connecting fault reader and selecting engine electronics control unit → Vehicle diagnosis, testing and information system VAS 5051.)
   
Indicated on display:
–  Press keys 0 and 8 for the function “Read measured value block” and confirm entry with Q key.
  
Rapid data transfer                 HELP
Select function XX
Indicated on display:
–  Press keys 0, 0 and 7 for “Display group number 7” and confirm entry with Q key.
  
Read measured value block           HELP
Input display group number XXX
Indicated on display:
–  If no realistic display appears in display zone 1 or a substitute temperature of -5.4 °C is displayed, check fuel temperature sender and wiring to the sender as follows:
–  Press the → key.
–  Press keys 0 and 6 for the function “End output” and confirm entry with the Q key.
–  Switch off ignition.
  
Read measured value block 7            →
15.4 °C            15.9 °C       16.7 °C
–  Separate 10-pin connector -arrow- for fuel temperature sender (connection to injection pump metering control).
  E10-0001
–  Measure resistance of sender at connector contacts 4+7.
  A23-0027
Specification see diagram
Scale A shows resistance values for temperature range 0...50 °C and scale B the values for temperature range 50...100 °C.
Examples:
t  30 °C corresponds to a resistance from 1500...2000 Ω
t  80 °C corresponds to a resistance from 275...375 Ω
If the specification is not attained:
–  Renew injection pump → Chapter.
If specification attained:
–  Remove wiper arms and cowl panel: → Electrical system; Rep. Gr.92
  N24-0157
–  Connect test box -V.A.G 1598/22- to control unit wiring harness.
  N24-0709
–  Check wiring for open circuit between test box and 10-pin connector according to current flow diagram. Contact 4+ socket 76 Contact 7+ socket 53 Wire resistance: max. 1.5 Ω
–  Additionally check wires for short to one another, to vehicle earth and to battery positive. Specification: ∞Ω
If no wiring fault is detected:
–  Renew engine control unit → Chapter.
  A23-0028

Exhaust system > < Checking components and functions