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Analysis measured value block, display groups 10...29 -ignition- > < Final control diagnosis

Leon Mk2

Final control diagnosis carrying out
Final control diagnosis carrying out
The final control diagnosis activates the following components in the stated sequence:
1. Throttle valve positioner -V60-
2. Activated charcoal filter solenoid valve 1 -N80-
3. EGR valve -N18-
4. Engine speed signal → Note
5. Fuel pump relay -J17-
6. Engine/air conditioner compressor electrical connection → Note
1)  Ignore.
Special tools and workshop equipment required
t  Fault reader -V.A.G 1551- or vehicle system tester -V.A.G 1552- with cable -V.A.G 1551/3B-
t  Test box -V.A.G 1598/31-
t  Hand multimeteR -V.A.G 1526 A- or multimeter -V.A.G 1715-
t  Diode test lamp -V.A.G 1527 B-
t  Adapter set -V.A.G 1594 C-
t  Current flow diagram
Check conditions
   
l  Fuses no. 15,18, 20 and 21, OK.
l  Battery voltage at least 11.5 V.
l  All electric consumers, eg: lights and rear window heater must be switched off.
l  Throttle valve potentiometer -G69- OK.
Test requirements for vehicles with air conditioning system
l  Vehicle at room temperature (warmer than +15 °C).
l  Air conditioning system switched on
l  Select lowest temperature and highest blower speed
  Note!
t  The final control diagnosis can only be carried out if the engine is off and ignition switched on.
t  The final control diagnosis will be broken off if the engine is started or a rotational impulse is recognised.
t  During the final control diagnosis the individual final controls will be activated until advancing to the next final control by pressing the → button.
t  The final controls are checked by sound or touch.
Work sequence
–  Connect fault reader -V.A.G 1551/V.A.G 1552-. Switch ignition on and select engine control unit with the “Address code” 01. (Fault reader: Connecting and selecting the engine control unit → Chapter).
  E01-0119
Indicated on display:
–  Operate the fault reader taking into account the reading on the display.
–  Press keys 0 and 3 for the function “Final control diagnosis”.
  
Rapid data transfer                 HELP
Select function                       XX
Indicated on display:
Activating throttle valve positioner -V60-:
  
Rapid data transfer                    Q
03-Final control diagnosis
Indicated on display:
The positioner should open and close the throttle valve until the key → is pressed to activate the next positioner.
If the throttle valve positioner does not move:
–  Check throttle valve positioner → Chapter; Throttle valve control part: checking:
–  Confirm input with Q -key.
Activating activated charcoal filter solenoid valve 1 -N80-:
–  Press → -key.
  
Final control diagnosis              -> 
Throttle valve positioner-           V60
Indicated on display:
The activ. charcoal filter solenoid valve (engine comp, right side) must click until key → is pressed to activate the next control element.
–  Pull hose off activated charcoal filter at solenoid valve.
–  Connect auxiliary hose to the vacant valve connection.
–  Blow into auxiliary hose during final control diagnosis (in direction of throttle valve control part). Valve must open and close
If the solenoid valve does not click:
–  Continue check → .
Activate exhaust gas recirculation valve -N18-
–  Press → -key.
  
Final control diagnosis               ->
Activ.charcoal filt. solenoid valve1 N80
Indicated on display:
–  Act. charcoal filter solenoid valve (engine comp, left side) must click, until key → is pressed to activate the next control element.
If the exhaust gas recirculation valve does not click:
–  Continue check → .
Displaying engine speed signal:
  Note!
This test is only possible on vehicles with revs counter. On vehicles without rev. counter switch to the next final control by pressing the → key when the following message is displayed.
–  Press → -key.
  
Final control diagnosis               ->
EGR valve                            N18
Indicated on display:
–  Rev. counter should show approx. 3000 rpm, until next final control element is activated by pressing the → key.
If no display appears:
–  Check the wiring to rev counter. Speed signal: testing → Chapter.
Activating fuel pump relay -J17-
–  Press → -key.
  
Final control diagnosis               ->
Engine speed signal
Indicated on display:
The fuel pump relay (on the relay plate, relay position 12) must click until the next final control is activated by pressing the → key.
  Note!
During the activation of the fuel pump relay the fuel pump must be heard to run at intervals.
If the relay does not click:
–  Check fuel pump relay → Current flow diagrams, Electrical fault finding and Fitting locations.
Check electrical connection with air conditioning:
  Note!
The test step is only for vehicles with air conditioner. On vehicles without air conditioner end final control diagnosis by pressing → key when the following message appears.
  
Final control diagnosis               ->
Fuel pump relay                      J17
Indicated on display:
The air conditioner compressor magnetic coupling must click, until ending final control diagnosis by pressing → key.
If the magnetic coupling does not click:
–  Check wiring from / to air conditioner → Chapter.
If the magnetic coupling clicks:
–  Press → -key.
  
Final control diagnosis               ->
Engine/AC. compr. electr. connection
Indicated on display:
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q -key.
–  Switch off ignition.
Continuation of check when the activated charcoal filter solenoid -1 does not click:
  
Rapid data transfer                 HELP
Select function XX
–  Pull the connector -1- off solenoid valve -2 -N80- and connect the diode test lamp -V.A.G 1527 B- to the unplugged connector, using auxiliary cables -V.A.G 1594 C-.
LED flashes:
–  Proceed with final control diagnosis until completed.
–  Switch off ignition.
–  Replace solenoid valve -1--N80- → Rep. Gr.20.
LED does not flash:
–  Proceed with final control diagnosis until completed.
–  Switch off ignition.
  E24-0011
–  Connect test box -V.A.G 1598/31- to control unit wiring harness. The engine control unit remains disconnected.
  N24-0943
–  Check wiring between test box socket 64 + 2-pin connector -2- for open circuit using current flow diagram.
   Wire resistance: max. 1.5 Ω
–  Check wiring additionally for short circuit to battery positive. and earth
   Specification: ∞ Ω
–  Check wire between 2-pin connector contact -1- and fuel pump relay -J17- for open circuit using current flow diagram
   Wire resistance: max. 1.5 Ω
If no wiring fault is detected:
–  Renew engine control unit → Chapter.
Continuation of test if the exhaust gas recirculation valve does not click:
  N24-0231
–  Unplug the 2-pin connector from the EGR valve -N18--arrow- (at camshaft housing, to left).
LED flashes:
  N01-0256
–  Connect diode test lamp -V.A.G 1527 B- to the unplugged connector, using auxiliary cables -V.A.G 1594 C-, and between contacts 1+5 check:
   The LED must flash (bright/darker)
–  Proceed with final control diagnosis until completed.
–  Switch off ignition
–  Replace exhaust gas recirculation valve -N18- → Rep. Gr.26.
LED does not flash:
–  Proceed with final control diagnosis until completed.
–  Switch off ignition
  N01-0258
–  Connect test box -V.A.G 1598/31- to control unit wiring harness. The engine control unit remains disconnected.
  N24-0943
–  Check wiring between test box socket 114+ 6-pin connector -5- for open circuit using current flow diagram.
   Wire resistance: max. 1.5 Ω.
–  Check wiring additionally for short circuit to battery positive. and earth.
   Specification ∞ Ω
–  Check wire between connector -1- of 6-pin connector and fuel pump relay -J17- for open circuit using current flow diagram.
   Wire resistance: max. 1.5 Ω
If no wiring fault is detected:
–  Renew engine control unit → Chapter.
  N01-0258

Analysis measured value block, display groups 10...29 -ignition- > < Final control diagnosis