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Throttle valve drive unit: testing > < Pre-catalyst lambda probe heating: testing

Leon Mk2

Post-catalyst lambda probe heating: testing
   
Post-catalyst lambda probe heating: testing
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 conditions
   
l  Fuse number 18, OK.
l  Battery voltage, 11.5 V minimum
l  Fuel pump relay, OK.
Test process
–  Connect the -V.A.G 1551- (V.A.G. 1552). Start the engine and enter “address code” 01 to select the engine control unit. (Fault reader: Connecting and selecting the engine control unit → Chapter.).
  E01-0119
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, 4 and 1 for “Display group number 41” and press Q to confirm the entry.
  
Read measurement value block        HELP
Enter display group number XXX
The display reads: (1...4 = display fields)
The display reads: (1...4 = display fields)
–  Check the state of the post-catalyst lambda probe heating in display field 4: Reading: CfS dCa ON.
  Note!
Lambda probe heating switches on and off depending on engine load state, so the reading in display field 4 can be CfS dCa ON or alternate between CfS dCa ON and CfS dCa OFF.
If the target value is reached:
–  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:
  
Read measurement value block    41    ->
         1         2         3         4
–  Unplug the 4-pin connector (black) to the post-catalyst lambda probe -G130--arrow-.
Test the voltage supply
  E24-0073
–  To measure the voltage, connect the multimeter at contacts 1+2 (connector to engine control unit) with auxiliary leads -V.A.G 1594 C-.
–  Start the engine and let it idle.
–  Measure the voltage supply and check display group 41, display field 4: Reading CfS dCa ON: Target value: 11.0...14.5 V Reading CfS dCa ON/CfS dCa OFF (alternately): Target value: oscillates between 0.0...12.0 V
–  Press →.
–  Press 0 and 6 for the function “End data transmission” and press Q to confirm the entry.
–  Switch off the ignition.
If there is no voltage:
  N24-0722
–  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 2+female contact 13 Wiring resistance: 1.5 Ω∼max.
If the target value is reached:
–  Test for open circuits in the wiring between 4-pin connector contact 1 and the fuel pump relay -J17-, following the wiring diagram. Wiring resistance: 1.5 Ω max.
  A24-0094

Throttle valve drive unit: testing > < Pre-catalyst lambda probe heating: testing