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Coolant temperature sender: testing > < Intake manifold pressure sender: testing

Leon Mk2

Intake air temperature sender: testing
   
Intake air temperature sender: testing
  Note!
Use only gold contacts to repair the sender connector contacts.
Special tools and workshop equipment required
t  Fault reader -V.A.G 1551- or Vehicle systems checker -V.A.G 1552- with Lead -V.A.G 1551/3B-
t  Test box -V.A.G 1598/22-
t  Hand-held multimeter -V.A.G 1526 A- or Multimeter -V.A.G 1715-
t  Auxiliary measurement set -V.A.G 1594 C-
t  Wiring diagram

Test process
–  Connect the -V.A.G 1551- (V.A.G. 1552). Switch on the ignition and enter “address code” 01 to select the engine control unit. (Fault reader: Connecting and selecting the engine control unit → Chapter.).
   
The display reads:
–  Press 0 and 8 for the function “Read measurement value block” and press Q to confirm the entry.
  
Rapid data transmission             HELP
Select function XX
The display reads:
–  Press 0, 0 and 4 for “Display group number 4” and press Q to confirm the entry.
  
Read measurement value block        HELP
Enter display group number XXX
The display reads: (1...4 = display fields)
–  Read the intake air temperature value in field 4.
–  Continue the test according to the following table:
  
Read measurement value block     4    ->
         1         2         3         4
Displayed valueCauseDisplayed value
Approx. ambient temperature → Note--- → Anchor
-40 °COpen circuit or short circuit to positive → Anchor
129 °CShort circuit to earth → Anchor

1)  If the display shows a temperature lower than sender ambient temperature, first test the sender wiring for contact resistances. Note that the sender can heat up due to irradiated heat when the vehicle is stopped.
If the ambient temperature is displayed, continue the test as follows:
Function test of the sender
   
–  Remove the intake air temperature sender with intake manifold pressure sender (the connector remains plugged in).
–  Store the intake air temperature value displayed in field 4.
–  Spray the sender with standard cooling spray, watching the temperature value. The temperature value should fall.
–  Press →.
–  Press 0 and 6 for the function “End data transmission” and press Q to confirm the entry.
–  Switch off the ignition.
If the target value is not reached:
–  Replace the intake manifold pressure sender -G71- with intake air temperature sender -G42- → Item.
If the display reads -40 °C, continue the test as follows:
  N24-0909
–  Unplug the 4-pin connector from the intake air temperature sender -G42- with intake manifold pressure sender -G71--arrow-.
  N24-0910
–  Bridge connector contacts 1+2 with auxiliary leads -V.A.G 1594 C- and check the values on the display.
If the displayed value jumps to 129 °C:
–  Press →.
–  Press 0 and 6 for the function “End data transmission” and press Q to confirm the entry.
–  Switch off the ignition.
–  Replace the intake manifold pressure sender -G71- with intake air temperature sender -G42- → Item.
If the displayed value holds at -40 °C:
–  Press →.
–  Press 0 and 6 for the function “End data transmission” and press Q to confirm the entry.
–  Switch off the ignition.
  N24-0804
–  Connect test box -V.A.G 1598/22- to the control unit wiring harness.
  N24-0709
–  Test for open circuits in the wiring between the test box and the 4-pin connector (connector to the control unit) following the wiring diagram.
   Contact 1+female contact 54
   Contact 2+female contact 56
Wiring resistance: 1.5 Ω∼max
–  Also test the wire for short circuit to battery positive. Target value: ∞ Ω
If no fault is found in the wiring:
–  Replace the intake manifold pressure sender -G71- with intake air temperature sender -G42- → Item.
If the display reads 129 °C, continue the test as follows:
  A24-0094
–  Unplug the 4-pin connector from the intake air temperature sender -G42- with intake manifold pressure sender -G71--arrow-.
If the displayed value jumps to -40 °C:
–  Press →.
–  Press 0 and 6 for the function “End data transmission” and press Q to confirm the entry.
–  Switch off the ignition.
–  Replace the intake air temperature sender -G42- with intake manifold pressure sender -G71- → Item.
If the display reads 129 °C:
–  Press →.
–  Press 0 and 6 for the function “End data transmission” and press Q to confirm the entry.
–  Switch off the ignition.
  N24-0910
–  Connect test box -V.A.G 1598/22- to the control unit wiring harness.
  N24-0709
–  Test for open circuits in the wiring between the test box and the 4-pin connector (connector to the control unit) following the wiring diagram.
   Contact 1+female contact 54
   Contact 2+female contact 56
Wiring resistance: 1.5 Ω∼max.
–  Test the wire for short circuit to battery positive. Target value: ∞ Ω
If no fault is found in the wiring:
–  Replace the intake air temperature sender -G42- with intake manifold pressure sender -G71- → Item.
  A24-0094

Coolant temperature sender: testing > < Intake manifold pressure sender: testing