Audi Workshop Service and Repair Manuals

Test requirements:

Fuse -S32 OK.

• ‒ Switch ignition on.
• ‒ → Connect diode lamp between each contact of the 4-pin connector at the output stages and engine ground.
  The diode lamp must light up for all contacts.

Note:

The primary voltage supply is measured via fuse -S32 and the primary coil of the ignition coil.

• ‒ → If diode lamp does not light up, check for open circuit in wiring between 4-pin connector at output stage ...

• ‒ → ... and contact 1 of relevant connector at ignition coil according to current flow diagram.

• ‒ → If no fault is present in this wiring, test for open circuit in wiring between contact 15 of connector for relevant ignition coil and fuse -S32 and in voltage supply to fuse according to current flow diagram.

Notes:

• ◆ A measurement of the primary resistance of the ignition coils is not normally necessary when using this test method (primary resistance about 0.4 ... 0.6 ω, measured between contact 1 and 15 of ignition coil).
• ◆ A high voltage blocking diode is installed in the secondary circuit of the ignition coil. For this reason, it is not possible to carry out a resistance measurement of the secondary coil using conventional testers.