SEAT Workshop Service and Repair Manuals

• ‒ Remove intake manifold upper part , removing and installing injectors.

Checking activation

Special tools, testers, measuring instruments and auxiliary items required

• ◆ 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

Check conditions

• ● Engine speed sender OK.
• ● Fuel pump relay OK

Test sequence

• ‒ → Pull 5 pin connector off ignition transformer -arrow-.

• ‒ → Pull plug -1- off connection -2- and connect diode test lamp V.A.G 1527 with aux. cables from V.A.G 1594 to the contacts of the plug.
• ‒ Operate starter and check injector voltage supply.
      LED must flicker
• ‒ Repeat check on injectors 2...6.

The LED does not flicker:

• ‒ 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 wiring between test box and 2 pin connector for open circuit according to current flow diagram.
      Injector 1: Contact 2+socket 24
      Injector 2: Contact 2+socket 25
      Injector 3: Contact 2+socket 26
      Injector 4: Contact 2+socket 2
      Injector 5: Contact 2+socket 3
      Injector 6: Contact 2+socket 4
      Wire resistance: Max. 1.5 ω
• ‒ Check wiring between 2 pin connector for injectors contact 1 and relay plate for open circuit according to current flow diagram.
      Wire resistance: Max. 1.5 ω
• ‒ Additionally check wires for short to one another.
      Specification: ∞ω

Checking resistance of injectors

• ‒ → Check resistance of injectors individually
      Specification: 15.0...21.5 ω

If the specification is not attained:

• ‒ Renew defective injector => Page 24-88, removing and installing injectors.

Checking spray pattern and for leaks

Special tools, testers and auxiliary items

• ◆ Adapter set V.A.G 1594
• ◆ Digital potentiometer V.A.G 1630
• ◆ Measuring unit V.A.G 1602

Test sequence

• ‒ → Pull 2 pin connector off coolant temperature sender -arrow-.

• ‒ → Set digital potentiometer V.A.G 1630 -side A- to 15 kωand using aux. cables from V.A.G 1594 connect to disconnected plug.

• ‒ → Remove injectors with fuel manifold -arrows-.

Note:

If the injectors are seated too securely in the inlet manifold lower part carefully lever out, using a 16 mm OJ spanner under valve body.

• ‒ Extend supply and return pipes using extension hoses if necessary.
• ‒ Place injectors in the measuring appliance V.A.G 1602.
• ‒ Reconnect connectors to all injectors.

• ‒ → Pull 5 pin connector off ignition transformer -arrows-.
• ‒ Operate starter (2nd person required). The injectors must pulsate and spray in accordance with firing order.
• ‒ Switch off ignition and check injectors for leaks. No more than
      2 drops/min
  may leak from each injector.

Note:

When installing the injectors ensure that the O-rings are not/will not be damaged. To facilitate installation, moisten O-rings slightly with oil.