Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1527 B
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598/31

Checking voltage supply

• ‒ Switch off ignition.

• ‒ → Unscrew bolts -arrows- and remove engine cover panels -A...C-.
• ‒ Unplug the connector from the relevant exhaust gas temperature sender.

• ‒ → Connect voltage tester V.A.G 1527 B as follows:

• ‒ Operate starter briefly.
• ‒ The LED should light up.

If the LED does not light up:

• ‒ Carry out the following tests (marked with dots):

• ● → Test fuse No. S234 (in fuse box, socket 34)
• ● Test for open circuit in wiring from exhaust gas temperature sender to fuel pump relay via fuse -S234 (socket 34 in fuse box):

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

• ● Test fuel pump relay .

=> Motronic injection and ignition system; Repair group 24; Servicing Motronic injection system; Testing fuel pump relay and activation

• ‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit.Do notconnect to the engine control unit itself.

=> Motronic injection and ignition system; Repair group 24; Servicing Motronic injection system; Testing fuel pump relay and activation

• ‒ → Test for open circuit and short to positive or earth in the following wiring connections:

If the wiring is OK:

• ‒ Renew exhaust gas temperature sender.

If the same fault occurs after renewing the exhaust gas temperature sender:

• ‒ Fit a new engine control unit .

=> Motronic injection and ignition system; Repair group 24; Servicing Motronic injection system; Renewing engine control unit