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

Check conditions

• ‒ → Pull fuse No. 14 out of fuse holder.

Note:

Removing fuse No. 14 interrupts the voltage supply to the injectors and fuel pump.

• ● All fuses must be OK.
• ● Engine speed sender OK, checking
• ● Hall sender OK, checking

Note:

Ignition coils and output stages are single components and cannot be renewed separately.

Test sequence

• ‒ → Pull connector off ignition coil to be checked.

Checking voltage supply

• ‒ → Measure supply voltage between contacts 1 + 3 and 2 + 3 of the pulled-off connector using multimeter and adapters from V.A.G 1594.
• ‒ Switch on ignition.
      Specification: min. 11.5 V
• ‒ Switch off ignition.

If no voltage is present:

• ‒ → Check wiring for open circuit between contact 3 of 4-pin connector and relay plate using current flow diagram.
      Wire resistance: max. 1.5 ω
• ‒ Check wiring for open circuit between contact 1 of 4-pin connector to earth and contact 2 to earth.
      Wire resistance: max. 1.5 ω

If there is no fault in the supply voltage:

Checking activation

• ‒ → Using adapters from V.A.G 1594, connect diode test lamp V.A.G 1527 to
      Contact 4 and engine earth
  of the connector pulled off cylinder 1.
• ‒ Operate starter and check the ignition signal from engine control unit.
      The LED must flicker
• ‒ Repeat test on connectors for cylinders 2 through 6.
• ‒ Switch off ignition.

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

• ‒ Renew respective ignition coil with output stage.
• ‒ Interrogate fault memory, if necessary, repair any faults and then erase fault memory , interrogating and erasing fault memory.
• ‒ Read-out the readiness code=> Page 01-64.

The LED does not flicker:

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 for open circuit between test box and 4-pin connector using current flow diagram. For
      Cylinder 1, contact 4 + socket 102
      Cylinder 2, contact 4 + socket 110
      Cylinder 3, contact 4 + socket 94
      Cylinder 4, contact 4 + socket 111
      Cylinder 5, contact 4 + socket 103
      Cylinder 6, contact 4 + socket 95
      Wire resistance: max. 1.5 ω

• ‒ Additionally check wires for short to one another.
      Specification: ∞ω

If no wiring fault is detected and voltage was present between contacts 1+3 and 2+3.

• ‒ Replace engine control unit
  => Page 24-150.