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Test condition > < Coolant temperature sender: testing

Leon Mk2

Test process
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 1 for “Display group number 1” 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 coolant temperature value displayed in field 2.
  
Read measurement value block     1    → 
1            2            3            4
DisplayCauseContinue test
-40 °COpen circuit or short circuit to positive → Anchor
120 °CShort circuit to earth → Anchor
Approx. coolant temperature → Note--Only in event of display of sporadic fault: → Note → Anchor

1)  If the display shows a temperature that differs significantly from sender ambient temperature, test the sender wiring for contact resistances.
2)  The test is only possible when the engine is cold.
If the display reads -40 °C, continue the test as follows:
   
–  Unplug the 4-pin connector from the coolant temperature sender -G62- with coolant temperature indicator sender -G2--arrow-.
  N24-1053
–  Bridge connector contacts with auxiliary leads -V.A.G. 1594 C- and check the values on the display. ► 11.99: contacts 1 + 3 12.99 ►: contacts 3 + 4
If the displayed value jumps to 120: °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 coolant temperature sender -G62- with coolant temperature indicator sender -G2- → 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.
  N24-1040
–  Connect test box -V.A.G. 1598/31- to the control unit wiring harness, without connecting the engine control unit.
  N24-0943
–  Test for open circuits in the wiring between the test box and the 4-pin connector following the wiring diagram.
  N24-1040
► 11.9912.99 ►
Contact 1+female contact 108Contact 3 + female contact 93
Contact 3+female contact 93Contact 4 + female contact 108
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 coolant temperature sender -G62- with coolant temperature indicator sender -G2- → Item.
If the display reads 120 °C, continue the test as follows:
   
–  Unplug the 4-pin connector from the coolant temperature sender -G62- with coolant temperature indicator sender -G2--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 coolant temperature sender -G62- with coolant temperature indicator sender -G2- → Item.
If the displayed value holds at 120 °C:
–  Press →.
–  Press 0 and 6 for the function “End transmission” and press Q to confirm the entry.
–  Switch off the ignition.
  N24-1053
–  Connect test box -V.A.G. 1598/31- to the control unit wiring harness, without connecting the engine control unit.
  N24-0943
–  Test for open circuits in the wiring between the test box and the 4-pin connector following the wiring diagram.
  N24-1040
► 11.9912.99 ►
Contact 1+female contact 108Contact 3 + female contact 93
Contact 3+female contact 93Contact 4 + female contact 108
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 coolant temperature sender -G62- with coolant temperature indicator sender -G2- → Item.
If the display shows the coolant temperature, continue the test as follows:
   

Test condition > < Coolant temperature sender: testing