SEAT Workshop Service and Repair Manuals

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

1. Activated charcoal filter solenoid valve 1 -N80

2. EGR valve -N18

3. Secondary air pump relay -J299

4. Charge pressure control solenoid valve -N75

5. Injector, cylinder 1 -N30

6. Injector, cylinder 3 -N32

7. Injector, cylinder 4 -N33

8. Injector, cylinder 2 -N31

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 1598/31
• ◆ Adapter set V.A.G 1594
• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Diode test lamp V.A.G 1527
• ◆ Current flow diagram

Test conditions

• ● → Fuse No. 10, 13 and 14 OK
• ● Ignition on, engine not running
• ● Voltage supply for Motronic (J271) OK

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. 60 seconds or until advancing to the next final control by pressing the ⇒ button.
• ◆ The final control diagnosis can be aborted by pressing the C key so that it need not be continued with the ⇒key to the end. This is especially important because the injectors can be actuated with the ⇒key according to the firing order and inject fuel.
• ◆ 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.
• ◆ The electric fuel pump will run during the complete final control diagnosis.

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".

• ‒ Confirm input with Q key.

Activating activated charcoal filter solenoid valve 1 (N80):

• The activated charcoal filter solenoid valve 1 must click until the next final control is activated by pressing ⇒key.

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:

• ‒ Renew solenoid valve.

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

LED does not flash:

• ‒ → Connect diode test lamp V.A.G 1527 to disconnected connector contact 1 and earth using auxiliary cables from V.A.G 1594.
      The LED must light up.

LED does not light up:

• ‒ 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

LED lights up:

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

• ‒ → Connect test box V.A.G 1598/31 to control unit wiring harness. The engine control unit remains disconnected.
• ‒ 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.

If no fault is detected in the wiring:

• ‒ Renew engine control unit => Page 24-109.

Activating EGR valve (N18):

• ‒ Press ⇒key.

• The EGR valve must click until the next control element is activated by pressing the ⇒ key.

If the valve does not click:

• ‒ → Pull connector -1- off valve -2- and connect diode test lamp V.A.G 1527 to contacts 1 + 5 of disconnected connector using adapter cables from V.A.G 1594.
      The LED must flash.

LED flashes:

• ‒ Replace EGR valve -N18:

=> Repair group 26; Exhaust gas recirculation system; Removing and installing parts of exhaust gas recirculation system

LED does not flash:

• ‒ → Connect diode test lamp V.A.G 1527 to disconnected connector contact 1 and earth using auxiliary cables from V.A.G 1594.
      The LED must light up.

LED lights up:

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

• ‒ → Connect test box V.A.G 1598/31 to control unit wiring harness. The engine control unit remains disconnected.
• ‒ Check wiring for open circuit between test box socket 114 + contact 5 of 6-pin connector using current flow diagram.
      Wire resistance: max. 1.5 ω
• ‒ Additionally check wire for short to battery positive and earth.

LED does not light up:

• ‒ Check wiring for open circuit between contact 1 of 6-pin connector and voltage supply relay for Motronic (J271) using current flow diagram.
      Wire resistance: max. 1.5 ω

If no fault is detected in the wiring:

• ‒ Renew engine control unit => Page 24-109.

Activating secondary air pump relay (J299):

• ‒ → Check fuse for secondary air pump relay (J299) (on lower relay carrier behind multi-function unit):

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

• ‒ Press ⇒key.

• The secondary air pump relay (J299) activates the secondary air pump motor, and this must run at intervals until the next control element is activated by pressing the ⇒ key.

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

• ‒ → Pull 2 pin connector -1- off secondary air pump motor -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 secondary air pump motor (V101):

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

If the LED does not flash but the secondary air pump relay clicks:

• ‒ Proceed with final control diagnosis until completed.
• ‒ Switch off ignition.
• ‒ Check the wire between secondary air pump motor (V101) and contact 1 and body earth for open circuit.

If no wiring fault is detected:

• ‒ → Pull secondary air pump relay -relay position 22- out of lower relay carrier behind multi-function unit.

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 wiring for open circuit between contact 2 of secondary air pump motor (V101) and contact 2 of relay plate using current flow diagram.

If no wiring fault is detected:

• ‒ Using current flow diagram check the voltage supply (terminal 30) for secondary air pump relay (J299).

If voltage supply is OK:

• ‒ Renew secondary air pump relay (J299).

If the LED does not flash and the secondary air pump relay does not click:

• ‒ Proceed with final control diagnosis until completed.

• ‒ Switch off ignition.
• ‒ → Pull secondary air pump relay -relay position 22- out of lower relay carrier behind multi-function unit.

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.

• ‒ Connect the diode test lamp V.A.G 1527 to contacts 3 and 4 of relay plate using adapter cables from V.A.G 1594.
• ‒ Initiate final control diagnosis again and activate secondary air pump relay (J299).
      The LED must flash.

LED flashes:

• ‒ Renew secondary air pump relay (J299).

LED does not flash:

• ‒ Connect the diode test lamp V.A.G 1527 to contact 3 of relay plate and body earth using adapter cables from V.A.G 1594.
      The LED must light up.

LED does not light-up:

• ‒ Check wiring for open circuit between contact 3 of relay plate and battery (+) using current flow diagram.

LED lights up:

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

• ‒ → Connect test box V.A.G 1598/31 to control unit wiring harness. The engine control unit remains disconnected.
• ‒ Check wiring for open circuit between test box socket 66 and contact 3 on the relay plate using current flow diagram.
      Wire resistance: max. 1.5 ω

If no wiring fault is detected:

• ‒ Renew engine control unit => Page 24-109.

Activating charge pressure limitation solenoid valve (N75):

• ‒ Press ⇒key.

• The solenoid valve must click.

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:

• ‒ Renew solenoid valve.

=> Repair group 21; Air charge system with turbocharger; Turbocharging overview

LED does not flash:

• ‒ Connect diode test lamp V.A.G 1527 to contact 1 of disconnected connector and earth using adapter cables from V.A.G 1594.
      The LED must light up.

LED does not light up:

• ‒ 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

LED lights up:

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

• ‒ → Connect test box V.A.G 1598/31 to control unit wiring harness. The engine control unit remains disconnected.
• ‒ Check wire between test box socket 104+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.

If no fault is detected in the wiring:

• ‒ Renew engine control unit => Page 24-109.

Activate injectors (N30...N33):

• ‒ Press ⇒key.

• ‒ Press ⇒key.

• Injector, cylinder No. 1 (N30) must click five times.

Note:

The fuel pump must run and the flow noise must be distinctly audible at the fuel pressure regulator. If the fuel pump does not run, check activation.

=> Repair group 20; Removing and installing parts of the fuel system; Checking fuel pump

• ‒ Press the ⇒key each time to advance to the next injector.
• ‒ In this way, all injectors can be checked one after the other in firing order.

If one of the injectors is not activated (does not click):

• ‒ Checking injectors => Page 24-60.
• ‒ Press ⇒key.

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