SEAT Workshop Service and Repair Manuals

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

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

• ◆ Current flow diagram

Check conditions

• ● → Fuse No. 13 must be OK.
• ● The battery voltage must be at least 11.5 V.
• ● Hall sender must be OK, checking
  .
• ● Engine speed sender must be OK, checking Page 24-58.

Note:

Ignition coils and final output stages are in a single component and cannot be renewed separately.

Test sequence

Checking voltage supply

• ‒ → Pull 4 pin connector -2- off ignition coil to be checked -1-.
• ‒ Using multimeter and adapter cables from V.A.G 1594 measure the supply voltage between contacts 1 + 2 and 1 + 4 of disconnected connector.
• ‒ Switch on ignition.
      Specification: Min. 11.5 V

• ‒ Switch off ignition.

If no voltage is present:

• ‒ → Check wiring for open circuit between 4-pin connector contact 1 and current supply relay for Motronic (main relay)using current flow diagram.
      Wire resistance: max. 1.5 ω

• ‒ Check wiring between 4-pin connector and earth for open circuit using current flow diagram.
      Contact 2 and earth
      Contact 4 and earth
      Wire resistance: Max. 1.5 ω

If there is no fault in the supply voltage:

• ‒ Check activation

Checking activation

• ‒ → Pull connectors off injectors.

• ‒ → Connect diode test lamp V.A.G 1527 with adapter cables from V.A.G 1594 to
      Contacts 2 + 3
  of disconnected connector.
• ‒ Operate starter and check the ignition signal from engine control unit.
      The LED must flicker
• ‒ Switch off ignition.

When the LED flickers and the supply voltage is OK.:

• ‒ Replace ignition coils with output stage

The LED does not flicker:

• ‒ Check wiring => Page 28-13

Checking wiring

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

• ‒ → Check wiring between test box and 4-pin connector for open circuit using current flow diagram.
      Cylinder 1 contact 3 + socket 102
      Cylinder 2 contact 3 + socket 95
      Cylinder 3 contact 3 + socket 103
      Cylinder 4 contact 3 + socket 94
  Wire resistance: Max. 1.5 ω
• ‒ Additionally check wires for short to one another.

If no fault can be found in the wiring:

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