SEAT Workshop Service and Repair Manuals

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

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

Check conditions

• ● Fuses No. 15, 18 and S130 OK.
• ● Idling switch OK, checking ,
  checking throttle valve control part

Notes:

• ◆ To activate the injectors the idling switch (in the throttle valve control part) must additionally be opened.
• ◆ The final control diagnosis will via the Motronic control unit activate each injector 5 times.

Work sequence

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552) and select engine electronics control unit (address word 01); carry out selection with ignition switched on.
  

• ‒ Operate fault reader taking into account the information on the display:
• ‒ Input 03 for "Final control diagnosis" function.

Activate Cyl. 1 injector (N30):

• ‒ Confirm input with Q button.

• ‒ Open throttle valve fully and close again.
      The Cyl. 1 injector must click

To activate injectors, Cyls. 2...6 in each case:

• ‒ Open throttle valve fully again and close.

Skipping individual tests:

• ‒ Press ⇒key.

If one or more injectors do not click:

• ‒ Continue final control diagnosis to the end.
• ‒ Switch off ignition.
• ‒ Checking injector actuation (resistance and current supply) => Page 24-92, checking injectors.

Activate solenoid valve 1 for activated charcoal filter (N80):

• ‒ Press ⇒key.

• The activated charcoal filter solenoid valve 1 (on air cleaner lower part) must click until the next final control element is selected by pressing the ⇒ key.

• ‒ Pull hose off solenoid valve (from activated charcoal filter).
• ‒ Connect auxiliary hose.
• ‒ During final control diagnosis blow into auxiliary hose (in direction of intake manifold upper part).
      Valve must open and close

If the solenoid valve does not click:

• ‒ → Pull 2 pin connector off valve and connect diode test lamp V.A.G 1527 with aux. cables from V.A.G 1594 to disconnected connector.
      The LED must flash

When LED flashes:

• ‒ Renew solenoid valve.

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

LED does not flash:

• ‒ Switch off ignition

• ‒ Remove dash panel insert:

=> Electrical system; Repair group 90

• ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.

• ‒ → Check wire between test box socket 31+2 pin connector contact 1 for open circuit according to current flow diagram.
      Wire resistance: Max. 1.5 ω

If no fault in wire is detected:

• ‒ Check solenoid valve voltage supply according to current flow diagram, if necessary renew Motronic control unit (J220) , item 2.

Activate exhaust gas recirculation valve (N18):

• ‒ Press ⇒ button.

• The exhaust gas recirculation valve must click until the next final control element is activated by pressing the ⇒ key.

If the exhaust gas recirculation valve does not click:

• ‒ → Pull 2 pin connector off valve 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:

• ‒ Replace exhaust gas recirculation valve:

=> Repair group 26; Exhaust gas recirculation system

LED does not flash:

• ‒ Switch off ignition
• ‒ Remove dash panel insert:

=> Electrical system; Repair group 90

• ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.

• ‒ Check wire between test box socket 30+2 pin connector contact 2 for open circuit according to current flow diagram.
      Wire resistance: Max. 1.5 ω

If no fault in wire is detected:

• ‒ Check exhaust gas recirculation valve voltage supply according to current flow diagram, if necessary renew Motronic control unit (J220) , item 2.

Activate secondary air inlet valve (N112):

• ‒ Press ⇒ button.

• The secondary air inlet valve must click until the next final control element is activated by pressing the ⇒ key.

If the secondary air inlet valve does not click:

• ‒ → Pull 2 pin connector off valve 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:

• ‒ Replace secondary air inlet valve:

=> Repair group 26; Secondary air system; Removing and installing parts of secondary air system

LED does not flash:

• ‒ Switch off ignition
• ‒ Remove dash panel insert:

=> Electrical system; Repair group 90

• ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.

• ‒ → Check wire between test box socket 50+2 pin connector contact 1 for open circuit according to current flow diagram.
      Wire resistance: Max. 1.5 ω

If no fault in wire is detected:

• ‒ Check secondary air inlet valve voltage supply according to current flow diagram, if necessary renew Motronic control unit (J220) Page 24-8, item 2.

Activate secondary air pump relay (J299):

• ‒ Press ⇒ button.

• The secondary air pump relay (J299) activates the secondary air pump motor (V101) which runs at intervals until the final control diagnosis is terminated by pressing the ⇒ key.

If the secondary air pump motor (V101) does not run at intervals:

• ‒ → Pull 2 pin connector off secondary air pump and connect diode test lamp V.A.G 1527 with aux. cables from V.A.G 1594 to disconnected connector.
      LED must flash

LED flashes:

• ‒ Renew solenoid valve.

=> Repair group 26; Secondary air system; Removing and installing parts of secondary air system

LED does not flash:

• ‒ Switch off ignition
• ‒ Remove dash panel insert:

=> Electrical system; Repair group 90

• ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.
• ‒ Pull cover off additional relays on left in engine compartment.

• ‒ → Pull secondary air pump relay -arrow 1- off relay plate.

Notes:

• ◆ If tools are necessary to pull relays or control units out of the relay plate, first disconnect battery earth strap.
• ◆ Before disconnecting battery earth strap obtain code for radios with anti-theft coding.

• ‒ → Check wire between test box socket 49 + contact 4 in relay plate for open circuit according to current flow diagram.
      Wire resistance: Max. 1.5 ω

If no fault in wire is detected:

• ‒ Check secondary air pump relay voltage supply using current flow diagram, if necessary replace Motronic control unit (J220) Page 24-8, item 2.
• ‒ Press ⇒ button.

Note:

After completion of the final control diagnosis input 06 for "End output" function and confirm with Q.

• ‒ Switch off ignition