Volkswagen Workshop Service and Repair Manuals

The final control diagnosis activates the following components in the stated sequence:

1. Fuel pump relay -J17

2. Solenoid valve 1 for activated charcoal filter -N80

3. Intake manifold change-over valve -N156

Special tools, workshop equipment, 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 1598/22

• ◆ Adapter set V.A.G 1594
• ◆ Diode test lamp V.A.G 1527
• ◆ Current flow diagram

Test conditions

• ● → Fuses 10, 29, 34 and 43 must be in order.

Notes:

• ◆ The final control diagnosis can only be carried out if the engine is stationary and ignition switched on.
• ◆ The final control diagnosis will be broken off if the engine is started or a rotational impulse is recognised.
• ◆ During the final control diagnosis the individual final controls will be activated for approx. 50 s, unless the next final control is selected by pressing the ⇒ key.
• ◆ The final controls are checked acoustically or by touching.
• ◆ If it is necessary to repeat the final control diagnosis, without first running the engine briefly, switch the ignition off for approx. 2 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 .)

• ‒ Operate fault reader taking into account the information on the display:
• ‒ Press keys 0 and 3 for the function "Final control diagnosis".

Activating fuel pump relay (J17):

• ‒ Confirm input with Q key.

• → The fuel pump relay (on the relay plate, relay position 4) must click until switching to the next final control by pressing the ⇒button (max. 50 seconds).

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 binder

Activating activated charcoal filter solenoid valve 1 (N80):

• ‒ Press ⇒key.

• The activated charcoal filter solenoid valve 1 (on activated charcoal filter) must click until the next final control element is activated by pressing the ⇒ button (max. 50 seconds).

If the solenoid valve does not click:

• ‒ → 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

LED flashes:

• ‒ Proceed with final control diagnosis until completed.
• ‒ Switch off ignition.
• ‒ Renew solenoid valve.

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

LED does not flash:

• ‒ Proceed with final control diagnosis until completed.
• ‒ Switch off ignition.

• ‒ → Connect test box V.A.G 1598/22 to control unit wiring harness.
• ‒ Check wire between test box socket 15+2 pin connector contact 2 for open circuit 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 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 => Page 24-104 .

Activating intake manifold change-over valve (N156):

• ‒ Press ⇒key.

• The twin path intake manifold change-over valve must click until the next final control is activated by pressing the ⇒key (max. 50 seconds).

Note:

Checking intake manifold change-over => Page 24-98 .

If the solenoid valve does not click:

• ‒ → 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

LED flashes:

• ‒ Proceed with final control diagnosis until completed.
• ‒ Switch off ignition.
• ‒ Renew solenoid valve -2-
  Page 24-17 , item 8 .

LED does not flash:

• ‒ Proceed with final control diagnosis until completed.
• ‒ Switch off ignition.
• ‒ → Connect test box V.A.G 1598/22 to control unit wiring harness.
• ‒ Check wire between test box socket 64+2 pin connector contact 2 for open circuit using 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 1 and fuse 34 for open circuit using current flow diagram.
       Wire resistance: max. 1.5 ω

If no wiring fault is detected:

• ‒ Renew engine control unit => Page 24-104 .
• ‒ Press ⇒key.

• ‒ Press ⇒key.

• ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
• ‒ Switch off ignition.