volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

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Read measured value block and basic settings > < Fault table

Golf Mk3

Motronic injection and ignition system
Self-diagnosis
Final control diagnosis

The final control diagnosis activates the activated charcoal filter solenoid valve 1.

Special tools, testers, measuring instruments and auxiliary items required

  • ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
  • ◆ Test box V.A.G 1598/18
  • ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
  • ◆ Diode test lamp V.A.G 1527
  • ◆ Adapter set V.A.G 1594
  • ◆ Current flow diagram

Test conditions

  • ● Fuse 15 and 21 OK.

Note:

If the final control diagnosis is to be repeated without the engine being started in between time, switch ignition off for approx. 20 seconds.

Work sequence

  • ‒ Connect the fault reader V.A.G 1551 (V.A.G 1552). Then switch ignition on and select engine control unit with the "Address word" 01.
    (Connecting fault reader and selecting engine control unit .)
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX
  • ‒ Operate fault reader taking into account the information on the display:
  • ‒ Press keys 0 and 3 for the function "Final control diagnosis".
 
→ Indicated on display:
Rapid data transfer     Q
03 Final control diagnosis
  • ‒ Confirm input with Q key.
 
→ Indicated on display:
Final control diagnosis     ⇒
Activ. charcoal filter solenoid valve 1     -N80
  • The solenoid valve (right suspension turret) must click.
  • ‒ Pull hose off activated charcoal filter at solenoid valve.
  • ‒ Connect an 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 clicks, opens and closes:

  • ‒ Press ⇒key.
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX
  • ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
  • ‒ Switch off ignition.

If the solenoid valve does not click:
 
N24-0298
  • ‒ → Pull connector -1- off solenoid valve -2- and connect diode test lamp V.A.G 1527 with aux. cables from V.A.G 1594 to disconnected connector.
         The LED must flash (bright/darker)

LED flashes:

  • ‒ Press ⇒key.
  • ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
  • ‒ Switch off ignition.
  • ‒ Renew solenoid valve -2-.

=> Repair group 20; Removing and installing parts of activated charcoal filter system

LED does not flash:

  • ‒ Press ⇒key.
  • ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
  • ‒ Switch off ignition.
 
N24-0137
  • ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.
  • ‒ Check wire for open circuit between test box sockets 3 and 2 pin connector contact 1, according to current flow diagram.
         Wire resistance: max. 1.5 ω
  • ‒ Additionally check wire for short to battery positive and earth.
         Specification: ∞ω
  • ‒ Check wire between 2 pin connector contact 2 and relay plate for open circuit using to current flow diagram.
         Wire resistance: max. 1.5 ω

If no wiring fault is detected:

  • ‒ Renew engine control unit
    => Page 24-11 , item 28

Read measured value block and basic settings > < Fault table