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Air mass meter: testing > < Temperature sender fuel: 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:
–  If no realistic reading or a supplementary temperature of -5.4 °C is displayed in field 1, test the fuel 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 fuel temperature sender Location of components, → Chapter
–  Measure the resistance between sender contacts 1 + 2.
  
Read measured value block      7       →
15.4 °C         15.9 °C          16,7 °C
Target value: see diagram
Zone A indicates the resistance values for the temperature range 0...65 °C, and zone B the values for the temperature range 65...100 °C.
Examples:
t  30 °C corresponds to a resistance of 3,790...4,270 Ω
t  80 °C corresponds to a resistance of 600...660 Ω
If the target value is not reached:
–  Replace the fuel temperature sender.
If the target value is reached:
  N23-0334
–  Attach the test box -V.A.G. 1598/31- to the wiring harness of the control unit.
–  Test for open circuits in the wiring between the test box and the connector, following the wiring diagram. Contact 1 + female contact 103 Contact 2 + female contact 111 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.
  E23-0032

Air mass meter: testing > < Temperature sender fuel: testing