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Brake light and brake pedal switches: testing > < Coolant temperature sender: testing

Leon Mk2

Test process
Test process
–  Attach the -V.A.G. 1551- (-V.A.G. 1552-) and, with corresponding “address code” 01, select the engine electronics control unit. When doing so, the engine must be running at idling revs. (Fault reader: connecting and selecting the engine electronics control unit → Vehicle diagnosis, testing and information system VAS 5051.)
   
Reading on the display:
–  Press 0 and 8 for the function “Read measured value block” and confirm the entry with the Q button.
  
Rapid data transmission             HELP
Select function XX
Reading on the display:
–  Press 0, 0 and 7 for the “Display group number 7” and confirm the entry with the Q button.
  
Read measured value block               
Enter value group number XXX
Reading on the display:
–  Watch the coolant temperature value in display field 4. The value should rise uniformly without interruption.
–  In the event of a fault, as supplementary values either the fuel temperature or the value of -5.4 °C is displayed.
–  If no realistic reading is displayed in field 4 or if the fuel temperature or -5.4 °C is displayed as a supplementary value, test the coolant temperature sender and the wiring to the sender, as follows:
–  Press →.
–  Press 0 and 6 for the function “End transmission” and confirm the entry with the Q button.
–  Switch off the ignition.
–  Remove the connector from the sender Location of components, → Chapter
  
Read measured value block 7            →
15.4 °C     0%     15.9 °C      16.7 °C
–  Measure the resistance between contacts 1 + 3 on the sender.
  N23-0350
Target value: see diagram
Zone A indicates the resistance values for the temperature range 0...50 °C, and zone B the values for the temperature range 50...100 °C.
Examples:
t  30 °C corresponds to a resistance of 1,500...2,000 Ω
t  80 °C corresponds to a resistance of 275...375 Ω
If the target value is not reached:
–  Replace the coolant temperature sender -G62-.
If the target value is reached:
  N24-0157
–  Attach the test box -V.A.G. 1598/31- to the wiring harness of the control unit.
  E23-0032
–  Test for open circuits in the wiring between the test box and the 4-contact connector, following the wiring diagram. Contact 3 + female contact 112 Contact 4 + female contact 104 Wiring resistance: 1.5 Ω max.
–  Also test for short circuits between wires, to vehicle earth and to positive battery. Target value: ∞ Ω
If no fault is found in the wiring:
–  Replace the direct diesel injection system control unit -J248- → Anchor.
  N23-0349

Brake light and brake pedal switches: testing > < Coolant temperature sender: testing